SGP/EBBR - EBBR E12 Anemometer Cups Frozen, Wind Speed Incorrect

The anemometer cups were frozen stalled during this period.

The following values were therefore incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws

• vector wind speed(res_ws)
• scalar wind speed(wind_s)

• scalar wind speed(wind_s)
• vector wind speed(res_ws)

• scalar wind speed(wind_s)

SGP/EBBR - EBBR E12 Net Radiation Incorrect

Condensation inside the domes (possibly water in the bottom dome also) 
during the period made daytime net radiation values as much as 50% too 
large and nighttime net radiations as much as 100% too small.  

The affected data are:

5 minute:  q
15 minute: mv_q
30 minute: q, h, e

• net radiation(q)

• net radiation(q)
• latent heat flux(e)
• h(h)

• Net radiation(mv_q)

SGP/EBBR - EBBR E12 Net Radiation Incorrect

The net radiometer top dome was broken and water had entered.  Net 
radiation values are therefore incorrect during the period.

The affected data are:

5 minute:  q
15 minute: mv_q
30 minute: q, h, e

• net radiation(q)

• net radiation(q)
• latent heat flux(e)
• h(h)

• Net radiation(mv_q)

SGP/EBBR/E12 - Invalid data due to blown AEM fuse at E12

On December 20, 1993, before 0730 GMT, the fuse in the AEM (Automatic
Exchange Mechanism) of Pawhuska, OK (E12) EBBR blew out.  The AEM remained
nonfunctional until the fuse was replaced just before 1500 GMT on
December 22, 1993.  This situation resulted in the following invalid data:

5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
          vp_top, vp_bot, home

15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, mv_home, tair_r,
           tair_l

30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h, home_15, home_30

Bowen, h, and e can not be recalculated from the 15 minute and/or 5 minute data
since we cannot determine the position of the sensors on the AEM from the home
signal; home signal is near zero when there is no power to the AEM.

• Bottom humidity(hum_bot)
• Home signal(home)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)
• Exchange mechanism position indicator (0 to 15 min)(home_15)

• Home signal(mv_home)
• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E12 - Wind Direction

For much of the period above, a malfunction in the E12 EBBR wind direction
sensor (insect larvae shorting out the circuit board) caused incorrect
values for 5 minute res_ws, wind_d, and sigma_wd, 15 minute mv_wind_d, and
30 minute res_ws, wind_d, and sigma_wd.  Wind direction normally indicated
north (near 0 or 360 degrees); there were some times during the period when
wind directions looked good, but the lack of variation in direction and sigma
implies that the data is suspect.  Therefore, it would be wise to flag all
of the values listed above during the entire time period as incorrect.
The wind direction sensor (S/N 3081) was replaced with S/N 3042 at 1515 GMT
on June 8, 1994.

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - Aspirator Failure

On June 18, 1994 the aspirator fan in the EBBR at E12, Pawhuska stopped
working.  This situation was not discovered until a Preventative
Maintenance visit by site operations personnel on June 22, 1994.  I
determined the time of the beginning of the malfunction from close
inspection of the sensible and latent heat flux data.  There is no aspiration
status output for the EBBRs, nor is one presently possible.  Wind speeds during
most of the period listed were sufficient to provide some (although
inadequate) aspiration to the temperature and relative humidity probes, making
it difficult for most users of the data to be able to tell (except in a few
circumstances) that the sensible and latent heat flux values produced were
incorrect.  All of the data fields listed below are incorrect for the period
listed above.  Latent and Sensible heat fluxes cannot be recomputed, as the
measurements that they are based on are what was corrupted.

30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h

15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l

5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)

• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E12 - Stopped Ventilation Fan

On August 4, 1994, a site operator discovered the ventilation fan of the
EBBR to be stopped; the fan guard was clogged with animal remains.
Inspection of the EBBR data from Pawhuska, OK, E12 indicates that this
condition occurred from July 22 through August 4.  Lack of ventilation of
the temperature and relative humidity sensors attached to the AEM results
in questionable measurements of air temperature, relative humidity, and all
quantities calculated from them, including sensible and latent heat fluxes.
The quantities that are questionable for the period indicated are:

5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, and vp_bot

15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l

30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)

• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E12 - Miscellaneous Problems Affecting Data

Three hardware problems occurred at E12, Pawhuska, OK in late August 1994.

On August 12 the wind direction sensor malfunctioned.  Therefore, all wind
direction, sigma, and resultant wind speed values for the period above are
incorrect.  The wind direction sensor was replaced on August 31.  Affected
data are:

        5 minute:  wind_d, sigma_wd, res_ws
        15 minute: mv_wind_d
        30 minute: wind_d, sigma_wd, res_ws.

Water accumulated in the AEM motor box and apparently caused a reduction in
the voltage level of the home signal (battery condition was very good and so
was not the cause); by late August 27 the hom30 level had fallen below the
minimum qc check level.  The AEM continued to exchange properly.  The minimum
qc level check is intended to help detect either a non-operating AEM or low
battery condition.  The Campbell CR10 software operates properly unless the
hom30 signal is thirty-five or greater.  So the low hom30 values do not
result in any incorrect data!!!.  I point this out because this situation
demonstrates a condition flagged by the qc checks, even though no effect on
the data has occurred.  The AEM box was dried out and new dessicant placed
in it on August 31.

On August 28, 1994 the left AEM housing ventilation fan ceased to operate
because of clogging of the ventilation system with debris.  Fifteen minute
data seems to indicate that the fan stopped operating just before 1245 GMT.
This is at least the third such incidence of clogging this summer at different
EBBRs.  The clog was removed and ventilation restored on August 31.  The lack
of ventilation caused improper measurements of temperature and
relative humidity in the left housing (these are quite obvious in the 15
minute data but difficult to detect in the 30 minute data) and therefore
incorrect values of sensible and latent heat.  Affected data are:

        5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top,
                   hum_bot, vp_top, vp_bot
        15 minute: rr_thum_l, mv_hum_l, tair_l
        30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top,
                   hum_bot, vp_top, vp_bot, bowen, e, h.

• vector wind speed(res_ws)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• wind direction (relative to true north)(wind_d)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• wind direction (relative to true north)(wind_d)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• vector wind speed(res_ws)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)

• Home signal(mv_home)
• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Wind direction (relative to true north)(mv_wind_d)
• Left relative humidity(mv_hum_l)

SGP/EBBR/E12 - Low home_15 Values

The home signal values for the EBBR system installed at E12, Pawhuska, OK have
generally been lower than for the other EBBR systems.  However, during the
period above the home_15 value was often lower than 35, which is then
improperly interpreted by the CR10 software.  A home_15 value less than 35 is
interpreted as meaning that the AEM aspirated housings (which hold the
temperature and relative humidity sensors) are in the opposite orientation to
what they actually are.  The AEM continues to exchange properly, but the
resulting calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect.  On September 15, 1994 Site Operations personnel
refurbished the wiring for the left housing and the home_15 signal returned
to proper levels.

When 30 minute home_15 values are below 35, the data fields listed below are
incorrect.

5 minute:  home, tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot

15 minute: mv_home

30 minute: home_15, tair_top, tair_bot, thum_top, thum_bot, hum_top,
           hum_bot, vp_top, vp_bot, Bowen, e, h

It is possible to recalculate the Bowen ratio, e, and h by using the 15
minute data to compute the correct gradients of temperature and relative
humidity (two 15 minute periods are averaged to give a half hour value); the
orientation of the AEM is obvious in the 15 minute data, based on the home
signal (which is largest for the first 15 minutes of the half hour).  More
information on performing this recalculation can be obtained from the
mentor.

• Top humidity(hum_top)
• bottom air temperature(tair_bot)
• bottom vapor pressure(vp_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Bottom humidity(hum_bot)
• Temperature of the top humidity chamber(thum_top)
• Home signal(home)
• Temperature of bottom humidity sensor chamber(thum_bot)

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• h(h)
• top air temperature(tair_top)
• Exchange mechanism position indicator (0 to 15 min)(home_15)

• Home signal(mv_home)

SGP/EBBR/E26 - T/RH Check

During the month of November 1994, site operations personnel conducted
field comparisons of the temperature and relative humidity sensors in the
EBBRs and the HMI31 portable T/RH meter (with the removable probe).  As is
reflected in the home signal output, the automatic exchange mechanism was
disabled in order to conduct the checks.

Measurements were taken every 5 minutes, for a half hour each in the
aspirated radiation shields (the HMI31 was inserted into the EBBR aspirated
radiation shield to provide the same aspiration as the EBBR sensors
received).  Measurements of aspirator flow were also recorded.  This
information was provided to the mentor.  The mentor then compared the field
checks with the data recorded by the EBBRs.

The periods of data and data fields that are incorrect because of the checks
are listed below.  Times are those at which the data are reported.


Data Fields

5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot
15 minute: rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l, tair_r, tair_l
30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
           vp_top, vp_bot, bowen, e, h

5 minute:  1615, 1620, 1625, 1630, 1635, 1640, 1645, 1650, 1655,
           1700, 1705, 1710, 1715, 1720, 1725, 1730, 1735
15 minute: 1615, 1630, 1645, 1700, 1715, 1730, 1745
30 minute: 1630, 1700, 1730, 1800

(EDITOR'S NOTE:  The following analysis refers to all EBBRs installed in Nov 1994)

Results of the T/RH comparisons:
The combined accuracy of the HMI31 and EBBR temperature sensors
(thermocouples or PRTDs) is +/- 0.4 degrees C.  The combined accuracy of the
HMI31 and EBBR RH sensors is +/- 4% for RH less than 80%, and +/- 6% for RH
greater than 80%.  The combined accuracy for each pair of EBBR sensors of
the same type is essentially the same as the quantities stated above.

All of the pairs of EBBR sensors show differences that fall within the
stated combined accuracies.  Although this sounds wonderful, a few of the
differences are close to the combined accuracy, which, because of the small
differences in temperature being measured (normally smaller than the
magnitude of the combined accuracy) could lead to some incorrect estimation
of sensible and latent heat flux.  However, unless there would be substantial
differences of calibration slope of two sensors in a pair, the switching of
height of the sensors every 15 minutes by the automatic exchange mechanism
will remove the offset between the sensors.

The comparisons between the EBBR sensors and the HMI31 T/RH meter showed
much larger differences.  The range of differences were: -2.4 to 0.0 degrees
for the thermocouples, -2.1 to 0.1 degrees for the RH probe PRTDs, and -6.6 to
6.7 percent for the RH sensors.  Six Thermocouples indicated differences from
the HMI31 greater than the combined accuracy.  Seven PRTDs indicated
differences from the HMI31 greater than the combined accuracy.  Four RH
sensors indicated differences from the HMI31 greater than the combined
accuracy.  The temperature differences (for both thermocouples and PRTDs)
were nearly all of one sign; the HMI31 indicated the greater temperature,
which may suggest a bias in the HMI31 temperature measurement, even though
a dozen differences of +/- 0.2 degrees were measured.  Four differences of
zero and only one positive difference (out of 40) were measured.  Thirteen of
the 20 RH differences were positive (HMI31 indicating the lower
RH), with the differences near the level of the combined accuracies being
approximately 50% positive and 50% negative.  It does not appear that the
HMI31 has a RH bias.

Plots of EBBR sensor/HMI31 differences as a function of time from the
installation of the individual sensors (a range of 10 to 30 months in the
field) shows no obvious pattern of sensor drift with time.  This is encouraging.

• Temperature of right humidity sensor chamber(rr_thum_r)
• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right relative humidity(mv_hum_r)
• Left relative humidity(mv_hum_l)
• Right air temperature(tair_r)

• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• Bottom humidity(hum_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• Temperature of the top humidity chamber(thum_top)
• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Top humidity(hum_top)

• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• top vapor pressure(vp_top)
• top air temperature(tair_top)
• Top humidity(hum_top)
• Temperature of the top humidity chamber(thum_top)
• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• h(h)
• bottom air temperature(tair_bot)
• latent heat flux(e)

SGP/EBBR/E12 - Wind Direction Malfunction

For most of the period above, a malfunction in the E12 EBBR wind direction
sensor caused the following data values to be incorrect:

5 minute: res_ws, wind_d, and sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, and sigma_wd.

Wind direction normally indicated near north or 135 degrees (the latter
indicates a malfunction).

The wind direction sensor (S/N 3036) was replaced with S/N 3034 at 1620 GMT
on April 26, 1995.

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - Wind Direction Malfunction

For the period indicated, a malfunction in the E12 EBBR wind direction
sensor caused the following data values to be incorrect:

5 minute: res_ws, wind_d, and sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, and sigma_wd.

Wind direction normally indicated smaller or larger than it should have.
The affected time period was determined from comparison with data from E7,
Elk Falls EBBR, which is located north of E12.

The wind direction sensor (S/N 3034) was replaced with S/N 3039 at 1822 GMT
on June 7, 1995.

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - Wind Direction Malfunction

For the period indicated, a malfunction in the E12 EBBR wind direction
sensor caused the following data values to be incorrect:

5 minute: res_ws, wind_d, and sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, and sigma_wd.

Wind direction normally indicated small values (15 to 25 degrees) from 3 July
1995 at 0600 GMT through 6 July 1995 at 1500 GMT (at which time the sensor
was removed).  No sensor was in place between 6 July 1995 at 1500 GMT and 7
July 1995 at 1605 GMT (at which time a new sensor was installed).
 Old sensor S/N K3039, new S/N K3033.

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - AEM Failure

As noted in a previous DQR, the home signal values at E12, Pawhuska, OK
began decreasing in July.  At the beginning of the period listed, the home
30 value dropped below 15; this causes a data quality message to be output in
the site operations log as the stated acceptable range for home 30 is 15 to
34.999999.  No data is incorrect as a result of this condition.

The home 15 value dropped below 35 beginning July 21, 1995, sometime after
2000 GMT; this causes a data quality message to be output in the site
operations log as the stated acceptable range for home 15 is 35 to
70.  Data is incorrect as a result of this condition, that being 30 minute e,
h, and bowen.

The home values frequently dropped below their proper levels until 10 August,
1995, at some time after 1100 GMT, when the set screws in the AEM would no
longer hold and the aspirator units were stranded inbetween the home
positions.  Thereafter, the reported home signals were negative.  All 30
minute e, h, and bowen data are incorrect for this condition.

On August 16, 1995, at about 1600 GMT, site operators determined that they
could not repair the AEM on-site and they determined that the replacement AEM
that they took with them has an electronic short.  Therefore, the AEM was
left in manual mode (no exchange).  Replacement of the AEM will not take
place until a working spare is available and all 30 minute e, h, and bowen
data will be incorrect until then.

I will submit another DQR or addendum when successful replacement of the
AEM is accomplished.

• Home signal(home)

• Exchange mechanism position indicator (15 to 30 min)(home_30)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• h(h)
• Exchange mechanism position indicator (0 to 15 min)(home_15)

SGP/EBBR/E12 - Wind Direction Malfunction

For the period above, a malfunction in the E12 EBBR wind direction
sensor caused the wind direction to output a constant 212 degrees.  Site
operations replaced the sensor (S/N K3033) with K3042.  The following data
values are incorrect for the period listed:

5 minute: res_ws, wind_d, and sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, and sigma_wd.

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - AEM replacement

Please see DQR P950816.2, where this problem was first documented.

As noted in a previous DQR, the home signal values at E12, Pawhuska, OK
began decreasing in July.  At the beginning of the period listed, the home
30 value dropped below 15; this causes a data quality message to be output in
the site operations log as the stated acceptable range for home 30 is 15 to
34.999999.  No data is incorrect as a result of this condition.

The home 15 value dropped below 35 beginning July 21, 1995, sometime after
2000 GMT; this causes a data quality message to be output in the site
operations log as the stated acceptable range for home 15 is 35 to
70.  Data is incorrect as a result of this condition, that being 30 minute e,
h, and bowen.

The home values frequently dropped below their proper levels until 10 August,
1995, at some time after 1100 GMT, when the set screws in the AEM would no
longer hold and the aspirator units were stranded inbetween the home
positions.  Thereafter, the reported home signals were negative.  All 30
minute e, h, and bowen data are incorrect for this condition.

On August 16, 1995, at about 1600 GMT, site operators determined that they
could not repair the AEM on-site and they determined that the replacement AEM
that they took with them has an electronic short.  Therefore, the AEM was
left in manual mode (no exchange).  All 30 minute e, h, and bowen data are
incorrect until the end of the period listed above.

On 13 September 1995 site operations personnel replaced the AEM
(old S/N 92005, new S/N 94008).  The new AEM would not exchange when the
right sensor was in the home position: this was confirmed on 14 September
when site operations personnel again visited the site.  However, soon after
the site operations personnel left Pawhuska on 14 September (at 1810 GMT),
the AEM started to exchange properly (data correct for 1900 GMT and after).
The AEM continues to operate properly.

• Home signal(home)

• Exchange mechanism position indicator (15 to 30 min)(home_30)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• h(h)
• Exchange mechanism position indicator (0 to 15 min)(home_15)

SGP/EBBR/E9 - 3-month Check

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during this period, at least,
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h),
or latent heat flux (e), nor do the air temperature and relative humidity
measurements indicate gradients.  Checks performed before or after the AEM
is disabled also lead to some incorrect data.

• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• Bottom humidity(hum_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Temperature of the top humidity chamber(thum_top)
• Top humidity(hum_top)

• Left air temperature(tair_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)

• latent heat flux(e)
• top air temperature(tair_top)
• Temperature of the top humidity chamber(thum_top)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• bottom vapor pressure(vp_bot)
• h(h)
• top vapor pressure(vp_top)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)

SGP/EBBR/E12 - AEM Failure/Right Radiation Shield OFF

On 18 November 1995 the AEM at E12, Pawhuska, OK stopped exchanging, with
the right radiation shield at the bottom position.  The 30 minute home
signal reflects this condition.  During the 21 November PM visit, the site
operators also found that the right radiation shield was no longer attached
to the AEM, but was dangling by its conduit.  It is not clear whether both
conditions occurred simultaneously.  Comparison of E12 data with that at
the Central Facility indicates that E12 data was correct on 17 November.

The AEM had stopped exchanging because a transistor became unsoldered from
the AEM circuit board.  Site operators repaired this and reattached the
right radiation shield to bring the system to operational status at 2130
GMT.

All 30 minute latent heat (e), sensible heat (h), and Bowen ratio (bowen)
data during the period above are incorrect.

• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• h(h)

SGP/EBBR/E12 - Wind Speed Cups Frozen

Freezing rain, snow, and below freezing conditions during 18 and 23 January 
1996 caused the wind speed sensor cups to freeze in a stopped state at E12, 
Pawhuska, OK.  The cups were freed up later on 18 January when the wind speed 
rose to above 10 meters per second.  When temperatures rose to above freezing 
on 24 January 1996, the ice thawed and the cups turned freely again. 

Measurements affected by the stalled wind speed sensor include:

5 minute:  wind_s, res_ws

15 minute: wind_s

30 minute: wind_s, res_ws

• vector wind speed(res_ws)
• scalar wind speed(wind_s)

• scalar wind speed(wind_s)
• vector wind speed(res_ws)

• scalar wind speed(wind_s)

SGP/EBBR/E12 - 3-month check

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during this period, at least,
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h),
or latent heat flux (e), nor do the air temperature and relative humidity
measurements indicate gradients.  Checks performed before or after the AEM
is disabled also lead to some incorrect data.  The period of incorrect
data for the EBBR is listed above; data times affected do not include the
beginning time and do include the ending time (data files are denoted by
the end time).

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)

• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled 
(reflected by home signals near zero) so that the two aspirator units
can be placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), 
or latent heat flux (e), nor do the air temperature and relative humidity 
measurements indicate correct gradients.  Checks performed before or after the 
AEM is disabled also lead to some incorrect data.  Incorrect 5, 15 minute and 
half hour data occurs for periods indicated.

• Temperature of the top humidity chamber(thum_top)
• bottom vapor pressure(vp_bot)
• Bottom humidity(hum_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Top humidity(hum_top)
• bottom air temperature(tair_bot)

• Left air temperature(tair_l)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• Right air temperature(tair_r)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Temperature of left humidity sensor chamber(rr_thum_l)

• Temperature of bottom humidity sensor chamber(thum_bot)
• top vapor pressure(vp_top)
• bottom air temperature(tair_bot)
• Temperature of the top humidity chamber(thum_top)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Bottom humidity(hum_bot)
• top air temperature(tair_top)
• bottom vapor pressure(vp_bot)
• Top humidity(hum_top)
• latent heat flux(e)

SGP/EBBR/E12 - Annual Calibration Changeout

On 9 October 1996 the EBBR changeout for annual calibration occurred at 
E12, Pawhuska, OK.  SEBS unit 10 was removed and unit 1 was installed.  Between 
1000 and 1500 GMT no data was collected.  Data for half hours 1530-2000 GMT is 
incorrect; 3 month calibration checks were being performed.

• Retrieved pressure profile(pres)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Reference Thermistor Temperature(tref)
• Temperature of bottom humidity sensor chamber(thum_bot)
• lat(lat)
• bottom vapor pressure(vp_bot)
• lon(lon)
• top air temperature(tair_top)
• scalar wind speed(wind_s)
• vector wind speed(res_ws)
• Bottom humidity(hum_bot)
• Home signal(home)
• net radiation(q)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Top humidity(hum_top)
• bottom air temperature(tair_bot)
• wind direction (relative to true north)(wind_d)

• 5 cm soil heat flow, site 1(shf1)
• net radiation(q)
• Soil heat capacity 4(cs4)
• 5 cm soil heat flow, site 3(shf3)
• Soil heat capacity 1(cs1)
• Soil heat capacity 2(cs2)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• 0-5 cm integrated soil temperature, site 2(ts1)
• wind direction (relative to true north)(wind_d)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• lon(lon)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• average surface soil heat flow(ave_shf)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 2(shf2)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• Soil heat capacity 3(cs3)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• Dummy altitude for Zeb(alt)
• Soil heat capacity 5(cs5)
• volumetric soil moisture, site 3(sm3)
• 5 cm soil heat flow, site 4(shf4)
• volumetric soil moisture, site 4(sm4)
• 0-5 cm integrated soil temperature, site 4(ts4)
• soil heat flow, site 2(g2)
• 5 cm soil heat flow, site 5(shf5)
• Time offset of tweaks from base_time(time_offset)
• volumetric soil moisture, site 1(sm1)
• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)
• h(h)
• soil heat flow, site 4(g4)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• base time(base_time)
• top air temperature(tair_top)
• volumetric soil moisture, site 2(sm2)
• scalar wind speed(wind_s)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 1(g1)
• 0-5 cm integrated soil temperature, site 5(ts5)
• Retrieved pressure profile(pres)
• 0-5 cm change in soil heat storage with time, site 5(ces5)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• soil heat flow, site 5(g5)
• vector wind speed(res_ws)
• soil heat flow, site 3(g3)
• lat(lat)
• 0-5 cm integrated soil temperature, site 3(ts3)
• volumetric soil moisture, site 5(sm5)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• 0-5 cm integrated soil temperature, site 2(ts2)

• Home signal(mv_home)
• Dummy altitude for Zeb(alt)
• Soil moisture 5(r_sm5)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil heat flow 3(mv_hft3)
• Soil moisture 3(r_sm3)
• Soil heat flow 2(mv_hft2)
• Net radiation(mv_q)
• Left air temperature(tair_l)
• lat(lat)
• Soil heat flow 4(mv_hft4)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Battery(bat)
• Soil temperature 3(rr_ts3)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• lon(lon)
• Soil moisture 4(r_sm4)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Right air temperature(tair_r)
• Soil moisture 1(r_sm1)
• Soil heat flow 5(mv_hft5)
• Wind direction (relative to true north)(mv_wind_d)
• Soil moisture 2(r_sm2)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 5(rr_ts5)
• Soil heat flow 1(mv_hft1)
• Soil temperature 4(rr_ts4)
• scalar wind speed(wind_s)
• Signature(signature)
• Atmospheric pressure(mv_pres)
• Reference temperature(rr_tref)

SGP/EBBR/E12 - Left Air Temperature Thermocouple Incorrect

The left air temperature thermocouple was offscale, for unknown reasons, for 
1715 GMT for 15 minute, and 1730 GMT for 30 minute air temperature values.

The malfunction of the air temperature thermocouple results in incorrect Bowen 
ratio, sensible heat flux, and latent heat flux during the period indicated. 

The data values that are affected are:

5 minute:  tair_top, tair_bot

15 minute: tair_l

30 minute: tair_top, tair_bot, bowen, e, and h

• top air temperature(tair_top)
• bottom air temperature(tair_bot)

• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• h(h)
• top air temperature(tair_top)

• Left air temperature(tair_l)

SGP/EBBR/E12 - Battery Voltage Low - Fluxes Affected

The battery condition deteriorated over time so that the solar panel was not 
always able to keep the battery voltage high enough to produce correct home 
signal values.  The home 15 signal was too low much of the period above, 
with home 30 being low also occasionally.  The home signal qc checks should 
be consulted to determine which half hour values of sensible (h) and latent (e)
heat fluxes are incorrect; no other data values were affected.  The first 
occurrence of low home 15 signal appears to be 0630 GMT on 13 July 1996.  
Battery voltage did not drop low enough to cause any sensors to stop 
functioning.  The battery was replaced on 9 October 1996 at 2000 GMT, 
during annual calibration changeout of the entire EBBR unit (the mentor 
assumes that the battery was replaced - no instrument maintenance reports 
are available for that time).

• Home signal(home)

• Exchange mechanism position indicator (15 to 30 min)(home_30)
• latent heat flux(e)
• h(h)
• Exchange mechanism position indicator (0 to 15 min)(home_15)

• Home signal(mv_home)

Controlled burn at E12 on 3/20/97 and affected data

DQR No:                               Platforms:  sgpsirosE12
                                                  sgpebbrE12

Subject: Controlled burn at E12 on 3/20/97 and affected data

Date Submitted:  3/31/97
Submitted By: Mike Splitt             ___  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      _x_  Other _Site_Scientist_Team_
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.

Platform/Measurement:
        What level data: (raw,a0,a1,b1,c1 etc):
             all levels
    What location was the data collected at: sgp E12
 
    Period of time in question
        Begin Date   3/20/97  Time   22:55    (GMT)
        End Date      *       Time     :      (GMT)

* The "end date" is not necessarily in need of definition. The EBBR data
  appears to be directly affected for a period of about one hour. The
  effect on the local shortwave albedo will be longer lasting and could 
  be said to "end" when the vegetative state recovers to being representative
  of similar areas.

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 ___  incorrect                         ___  Only some data fields affected
 ___  wrong calibration
 _x_  others 
 
 Discussion of Problem:

This report is reflective of a change in environmental conditions thought
to be worth noting at E12, Pawhuska, and does not concern any issue of
substandard sensor performance. 

A contolled burn was conducted at the the Pawhuska Extened Facillity (E12)
by the Tallgrass Prairie Preserve. The Preserve director, Bob Hamilton,
contacted the ARM SGP Site prior to the activity which allowed Site Operations
to take precautionary steps. Danny Nelson reported the following activities by
Site Operations:

1)  Site Ops cut and removed all dried grass within the EF fence and
also to a 10' perimeter around the outside of the fence.  Final grass
height was 1-3".  This was done on Monday the 17th of March.

2)  Tallgrass Prairie Preserve personnel put down a 10' wet line around
our EF prior to the burn on the 20th, so the EF area was not burned.

3)  Site Ops had originally planned to deploy a field crew to inspect
the site on the day following the burn.  TPP director Bob Hamilton had
agreed to call us the morning of the burn, but didn't actually call us
until this morning; the day following the burn.  Due to the short
notification and prior commitment of personnel, Site Ops will not be
able to travel to the site until Monday or Tuesday of next week.

John Shatz was given the following information about the duration of
the burn:

>Bob Hamilton called and indicated that they did a control burn of the
>Tall Grass Prairie yesterday(3-20-97).  He indicated that the fire in
>our area lasted between 4:55 PM to 5:40 PM.  He also said that they
>plan to put this control burning on a two to three year cycle.

Affect on ARM Data:

Review of the EBBR temperature data (the sensor in the lower position)
shows a dramatic increase of temperature from 26 to 37 Celsius in a 
10 minute period.  The temperatures appear to have been affected for 
approximately 1 hour. 

Analysis of the broadband shortwave albedo during this period reveals
changes that appear to be related to the burn. The following is 
a listing of the daily average shortwave albedos (caluclated by running a linear
regression fit on the "curve" created by plotting the upwelling shortwave 
vs. the downwelling shortwave values from the E12 SIROS broadband instrumentation):

    Date        Broadband Shortwave Albedo
    ________   ____________________________

    3-14-97              .171
    3-15-97              .171
    3-16-97              .169
    3-17-97              .166
    3-18-97              .135
    3-19-97              .171
    3-20-97              .174
    3-21-97              .141
    3-22-97              .143
    3-23-97              .148
    3-24-97              .147

The grass cutting activity at the EF does not appear to be responsible
for the abledo change on 3-18; this is likely related to the drizzle
and overcast sky conditions in the area on that day. Note that the albedo
recovers to previous values by the next day. 

The burn occured late on the 20th, and it appears the albedo after the
burn sustained a more long-lasting decrease in value.  Examination of
both the upwelling and downwelling solar irradiance indicates that 
the albedo change was a resultant of the decrease in upwelling irradiance,
as the downwelling values were comparable to other sites.

• Retrieved pressure profile(pres)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Reference Thermistor Temperature(tref)
• Temperature of bottom humidity sensor chamber(thum_bot)
• lat(lat)
• bottom vapor pressure(vp_bot)
• lon(lon)
• top air temperature(tair_top)
• scalar wind speed(wind_s)
• vector wind speed(res_ws)
• Bottom humidity(hum_bot)
• Home signal(home)
• net radiation(q)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Top humidity(hum_top)
• bottom air temperature(tair_bot)
• wind direction (relative to true north)(wind_d)

• 5 cm soil heat flow, site 1(shf1)
• net radiation(q)
• Soil heat capacity 4(cs4)
• 5 cm soil heat flow, site 3(shf3)
• Soil heat capacity 1(cs1)
• Soil heat capacity 2(cs2)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• 0-5 cm integrated soil temperature, site 2(ts1)
• wind direction (relative to true north)(wind_d)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• lon(lon)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• average surface soil heat flow(ave_shf)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 2(shf2)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• Soil heat capacity 3(cs3)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• Dummy altitude for Zeb(alt)
• Soil heat capacity 5(cs5)
• volumetric soil moisture, site 3(sm3)
• volumetric soil moisture, site 4(sm4)
• 5 cm soil heat flow, site 4(shf4)
• 0-5 cm integrated soil temperature, site 4(ts4)
• soil heat flow, site 2(g2)
• 5 cm soil heat flow, site 5(shf5)
• Time offset of tweaks from base_time(time_offset)
• volumetric soil moisture, site 1(sm1)
• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)
• h(h)
• soil heat flow, site 4(g4)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• base time(base_time)
• top air temperature(tair_top)
• volumetric soil moisture, site 2(sm2)
• scalar wind speed(wind_s)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 1(g1)
• 0-5 cm integrated soil temperature, site 5(ts5)
• Retrieved pressure profile(pres)
• 0-5 cm change in soil heat storage with time, site 5(ces5)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• soil heat flow, site 5(g5)
• vector wind speed(res_ws)
• soil heat flow, site 3(g3)
• lat(lat)
• 0-5 cm integrated soil temperature, site 3(ts3)
• volumetric soil moisture, site 5(sm5)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• 0-5 cm integrated soil temperature, site 2(ts2)

• Time offset of tweaks from base_time(time_offset)
• MFRSR channels(channel)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Flag fields with *1 returned from callang(flag_zero_divisor1-24)
• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Hemispheric Irradiance, MFRSR(hemisp_narrowband)
• Diffuse Hemispheric Irradiance, MFRSR(diffuse_hemisp_narrowband)
• Direct Normal Irradiance, Uncalibrated Silicon Detector, NIMFR(direct_norm_broadband)
• Diffuse Hemispheric Broadband Irradiance (Approximate), MFRSR(diffuse_hemisp_broadband)
• lon(lon)
• Flag fields with *4 returned from callang(flag_nighttime1-24)
• Hemispheric Irradiance, MFRSR(hemisp_broadband)
• Ventilated Pyrgeometer Dome Temperature(down_long_dome_temp)
• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• 10 meter Longwave Dome Temperature, Pyrgeometer(up_long_dome_temp)
• Thermistor Excitation Voltage, Data Logger(therm_volt)
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• lat(lat)
• MFRSR Detector Temperature(mfrsr_temp)
• 10 meter Longwave Case Temperature, Pyrgeometer(up_long_case_temp)
• Ventilated Pyrgeometer Case Temperature(down_long_case_temp)
• Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
• Logger panel temperature(logger_temp)
• base time(base_time)
• Flag fields with *3 returned from callang(flag_zero_cosine1-24)
• Flag fields with *2 returned from callang(flag_ln_error1-24)
• Downwelling Longwave Diffuse Hemispheric Irradiance, Ventilated Pyrgeometer(down_long_diffuse_hemisp)
• Upwelling (10 meter) Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• Dummy altitude for Zeb(alt)
• Data Logger Supply Voltage(logger_volt)

• Home signal(mv_home)
• Dummy altitude for Zeb(alt)
• Soil moisture 5(r_sm5)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil heat flow 3(mv_hft3)
• Soil moisture 3(r_sm3)
• Soil heat flow 2(mv_hft2)
• Net radiation(mv_q)
• Left air temperature(tair_l)
• lat(lat)
• Soil heat flow 4(mv_hft4)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Battery(bat)
• Soil temperature 3(rr_ts3)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• lon(lon)
• Soil moisture 4(r_sm4)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Right air temperature(tair_r)
• Soil moisture 1(r_sm1)
• Soil heat flow 5(mv_hft5)
• Wind direction (relative to true north)(mv_wind_d)
• Soil moisture 2(r_sm2)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 5(rr_ts5)
• Soil heat flow 1(mv_hft1)
• Soil temperature 4(rr_ts4)
• scalar wind speed(wind_s)
• Signature(signature)
• Atmospheric pressure(mv_pres)
• Reference temperature(rr_tref)

SGP/EBBR/E12 - Wind Direction Sensor Malfunctions

For much of the period above, a malfunction in the E12 EBBR wind direction 
sensor (insect larvae shorting out the circuit board) caused incorrect 
values for 5 minute res_ws, wind_d, and sigma_wd, 15 minute mv_wind_d, and 
30 minute res_ws, wind_d, and sigma_wd.  Wind direction normally indicated 
north (near 0 or 360 degrees); there were some times during the period when 
wind directions looked good, but the lack of variation in direction and sigma 
implies that the data is suspect.  Therefore, it would be wise to flag all
of the values listed above during the entire time period as incorrect. 
The wind direction sensor (S/N 3081) was replaced with S/N 3042 at 1515 GMT 
on June 8, 1997.

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E7 - EBBR Biannual Checks

During EBBR 6-month checks the Automatic Exchange Mechanism is disabled 
(reflected by home signals near zero) so that the two aspirator units
can be placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux (h), 
or latent heat flux (e), nor do the air temperature and relative humidity 
measurements indicate correct gradients.  Checks performed before or after the 
AEM is disabled also lead to some incorrect data.  Incorrect 5, 15 minute and 
half hour data occurs for periods indicated.

• Temperature of left humidity sensor chamber(rr_thum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Left relative humidity(mv_hum_l)
• Left air temperature(tair_l)
• Right air temperature(tair_r)
• Right relative humidity(mv_hum_r)

• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• top air temperature(tair_top)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• bottom air temperature(tair_bot)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• latent heat flux(e)
• h(h)
• Bottom humidity(hum_bot)
• Temperature of the top humidity chamber(thum_top)

• Temperature of the top humidity chamber(thum_top)
• Bottom humidity(hum_bot)
• top air temperature(tair_top)
• bottom air temperature(tair_bot)
• top vapor pressure(vp_top)
• Top humidity(hum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom vapor pressure(vp_bot)

SGP/EBBR/E26 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown)

The EBBR AEM stopped exchanging because of icing at during this time
period.

The calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect for the time period indicated.  The other
measurements listed  are also incorrect for those times:

• Temperature of right humidity sensor chamber(rr_thum_r)
• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right relative humidity(mv_hum_r)
• Left relative humidity(mv_hum_l)
• Right air temperature(tair_r)

• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• Bottom humidity(hum_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• Temperature of the top humidity chamber(thum_top)
• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Top humidity(hum_top)

• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• top vapor pressure(vp_top)
• top air temperature(tair_top)
• Top humidity(hum_top)
• Temperature of the top humidity chamber(thum_top)
• Bottom humidity(hum_bot)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• h(h)
• bottom air temperature(tair_bot)
• latent heat flux(e)

SGP/EBBR/E12 - AEM Failure and Replacement

The E12 AEM did not exchange for most of the period above, yielding small
negative home signals.  The AEM was replaced on 18 December by site
operations personnel.  All 30 minute e, h, and bowen data are incorrect for
the times when the home signal is incorrect, and the temperature, relative
humidity, and vapor pressures do not represent properly switched values.

• Bottom humidity(hum_bot)
• Home signal(home)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)
• Exchange mechanism position indicator (0 to 15 min)(home_15)

• Home signal(mv_home)
• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E2 - EBBR Net Radiometer Domes Pierced, Water Inside - Data Affected

The upper dome of the EBBR net radiometers was punctured.
After the puncture, water collected in the top and/or bottom dome.  The
water was removed and the dome was replaced during PM visits. 

 In some cases, the puncture and water resulted in incorrect data. 
Comparison with net radiation values from surrounding EBBR sites and the
SIRS is neccesary to determine if the EBBR net radiation data 
are correct or incorrect.

It is often difficult to tell from the data when the punctures occurred,
but they would have existed for no more than 2 weeks, since the domes
are checked during each two-weekly PM visit.

Incorrect net radiation data results in the latent heat flux and
sensible heat flux also being incorrect.

• Net radiation(mv_q)

• net radiation(q)

• latent heat flux(e)
• net radiation(q)
• h(h)

SGP/EBBR/E12 - 3-Month Check

During EBBR 3 month checks the Automatic Exchange Mechanism is disabled
(reflected by home signals near zero) so that the two aspirator units can be
placed at the same height.  The measurements during these periods 
do not produce correct outputs of bowen ratio (bowen), sensible heat flux
(h), or latent heat flux (e), nor do the air temperature and relative 
humidity measurements indicate correct gradients.  Checks performed before 
or after the AEM is disabled also lead to some incorrect data.  Incorrect 5,
15 minute and half hour data occurs for the period above.

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)

• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E12 - Wind Direction Sensor Failure

The wind direction sensor failed, producing zero values.  
The cause is unknown.  Data values affected are below:

 5 minute: res_ws, wind_d, sigma_wd

15 minute: mv_wind_d

30 Minute: res_ws, wind_d, sigma_wd

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - Six Month Checks

During EBBR 6 month checks (formally called 3 month checks) the Automatic 
Exchange Mechanism is disabled (reflected by home signals near zero) so that
the two aspirator units can be placed at the same height.  The measurements
during these periods do not produce correct outputs of bowen ratio (bowen), 
sensible heat flux (h), or latent heat flux (e), nor do the air temperature
and relative humidity measurements indicate correct gradients.  Checks 
performed just before or after the AEM is disabled also lead to some 
incorrect data.  Incorrect 5, 15 minute and half hour data occurs for the 
period indicated.

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• top air temperature(tair_top)

• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E12 - Wind Direction Data Incorrect (revised)

The wind direction sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  res_ws, wind_d, sigma_wd
15 minute: mv_wind_d
30 minute: res_ws, wind_d, sigma_wd

• standard deviation of wind direction (sigma theta)(sigma_wd)
• vector wind speed(res_ws)
• wind direction (relative to true north)(wind_d)

• vector wind speed(res_ws)
• standard deviation of wind direction (sigma theta)(sigma_wd)

• Wind direction (relative to true north)(mv_wind_d)

SGP/EBBR/E12 - Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• vector wind speed(res_ws)
• scalar wind speed(wind_s)

• scalar wind speed(wind_s)
• vector wind speed(res_ws)

• scalar wind speed(wind_s)

SGP/EBBR - EBBR E12 Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• Retrieved pressure profile(pres)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Reference Thermistor Temperature(tref)
• Temperature of bottom humidity sensor chamber(thum_bot)
• lat(lat)
• bottom vapor pressure(vp_bot)
• lon(lon)
• top air temperature(tair_top)
• scalar wind speed(wind_s)
• vector wind speed(res_ws)
• Bottom humidity(hum_bot)
• Home signal(home)
• net radiation(q)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Top humidity(hum_top)
• bottom air temperature(tair_bot)
• wind direction (relative to true north)(wind_d)

• null(Raw data stream - documentation not supported)

• 5 cm soil heat flow, site 1(shf1)
• net radiation(q)
• Soil heat capacity 4(cs4)
• 5 cm soil heat flow, site 3(shf3)
• Soil heat capacity 1(cs1)
• Soil heat capacity 2(cs2)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• 0-5 cm integrated soil temperature, site 2(ts1)
• wind direction (relative to true north)(wind_d)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• lon(lon)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• average surface soil heat flow(ave_shf)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 2(shf2)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• Soil heat capacity 3(cs3)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• Dummy altitude for Zeb(alt)
• Soil heat capacity 5(cs5)
• volumetric soil moisture, site 3(sm3)
• 5 cm soil heat flow, site 4(shf4)
• volumetric soil moisture, site 4(sm4)
• 0-5 cm integrated soil temperature, site 4(ts4)
• soil heat flow, site 2(g2)
• 5 cm soil heat flow, site 5(shf5)
• Time offset of tweaks from base_time(time_offset)
• volumetric soil moisture, site 1(sm1)
• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)
• h(h)
• soil heat flow, site 4(g4)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• base time(base_time)
• top air temperature(tair_top)
• volumetric soil moisture, site 2(sm2)
• scalar wind speed(wind_s)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 1(g1)
• 0-5 cm integrated soil temperature, site 5(ts5)
• Retrieved pressure profile(pres)
• 0-5 cm change in soil heat storage with time, site 5(ces5)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• soil heat flow, site 5(g5)
• vector wind speed(res_ws)
• soil heat flow, site 3(g3)
• lat(lat)
• 0-5 cm integrated soil temperature, site 3(ts3)
• volumetric soil moisture, site 5(sm5)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• 0-5 cm integrated soil temperature, site 2(ts2)

• Home signal(mv_home)
• Dummy altitude for Zeb(alt)
• Soil moisture 5(r_sm5)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil heat flow 3(mv_hft3)
• Soil moisture 3(r_sm3)
• Soil heat flow 2(mv_hft2)
• Net radiation(mv_q)
• Left air temperature(tair_l)
• lat(lat)
• Soil heat flow 4(mv_hft4)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Battery(bat)
• Soil temperature 3(rr_ts3)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• lon(lon)
• Soil moisture 4(r_sm4)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Right air temperature(tair_r)
• Soil moisture 1(r_sm1)
• Soil heat flow 5(mv_hft5)
• Wind direction (relative to true north)(mv_wind_d)
• Soil moisture 2(r_sm2)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 5(rr_ts5)
• Soil heat flow 1(mv_hft1)
• Soil temperature 4(rr_ts4)
• scalar wind speed(wind_s)
• Signature(signature)
• Atmospheric pressure(mv_pres)
• Reference temperature(rr_tref)

SGP/EBBR - EBBR E12 Wind Speed Data Incorrect

The wind speed sensor was iced stopped by freezing rain, 
resulting in the following values being incorrect:

5 minute:  wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws,

• Retrieved pressure profile(pres)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Reference Thermistor Temperature(tref)
• Temperature of bottom humidity sensor chamber(thum_bot)
• lat(lat)
• bottom vapor pressure(vp_bot)
• lon(lon)
• top air temperature(tair_top)
• scalar wind speed(wind_s)
• vector wind speed(res_ws)
• Bottom humidity(hum_bot)
• Home signal(home)
• net radiation(q)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Top humidity(hum_top)
• bottom air temperature(tair_bot)
• wind direction (relative to true north)(wind_d)

• null(Raw data stream - documentation not supported)

• 5 cm soil heat flow, site 1(shf1)
• net radiation(q)
• Soil heat capacity 4(cs4)
• 5 cm soil heat flow, site 3(shf3)
• Soil heat capacity 1(cs1)
• Soil heat capacity 2(cs2)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• 0-5 cm integrated soil temperature, site 2(ts1)
• wind direction (relative to true north)(wind_d)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• lon(lon)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• average surface soil heat flow(ave_shf)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 2(shf2)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• Soil heat capacity 3(cs3)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• Dummy altitude for Zeb(alt)
• Soil heat capacity 5(cs5)
• volumetric soil moisture, site 3(sm3)
• 5 cm soil heat flow, site 4(shf4)
• volumetric soil moisture, site 4(sm4)
• 0-5 cm integrated soil temperature, site 4(ts4)
• soil heat flow, site 2(g2)
• 5 cm soil heat flow, site 5(shf5)
• Time offset of tweaks from base_time(time_offset)
• volumetric soil moisture, site 1(sm1)
• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)
• h(h)
• soil heat flow, site 4(g4)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• base time(base_time)
• top air temperature(tair_top)
• volumetric soil moisture, site 2(sm2)
• scalar wind speed(wind_s)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 1(g1)
• 0-5 cm integrated soil temperature, site 5(ts5)
• Retrieved pressure profile(pres)
• 0-5 cm change in soil heat storage with time, site 5(ces5)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• soil heat flow, site 5(g5)
• vector wind speed(res_ws)
• soil heat flow, site 3(g3)
• lat(lat)
• 0-5 cm integrated soil temperature, site 3(ts3)
• volumetric soil moisture, site 5(sm5)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• 0-5 cm integrated soil temperature, site 2(ts2)

• Home signal(mv_home)
• Dummy altitude for Zeb(alt)
• Soil moisture 5(r_sm5)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil heat flow 3(mv_hft3)
• Soil moisture 3(r_sm3)
• Soil heat flow 2(mv_hft2)
• Net radiation(mv_q)
• Left air temperature(tair_l)
• lat(lat)
• Soil heat flow 4(mv_hft4)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Battery(bat)
• Soil temperature 3(rr_ts3)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• lon(lon)
• Soil moisture 4(r_sm4)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Right air temperature(tair_r)
• Soil moisture 1(r_sm1)
• Soil heat flow 5(mv_hft5)
• Wind direction (relative to true north)(mv_wind_d)
• Soil moisture 2(r_sm2)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 5(rr_ts5)
• Soil heat flow 1(mv_hft1)
• Soil temperature 4(rr_ts4)
• scalar wind speed(wind_s)
• Signature(signature)
• Atmospheric pressure(mv_pres)
• Reference temperature(rr_tref)

SGP/EBBR/E12 - Data Incorrect

Most of the data values for just this time (1630 GMT) for the 5, 15, and 30
minute periods are incorrect; this apparently was the result of PM activities.

• Retrieved pressure profile(pres)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• Reference Thermistor Temperature(tref)
• Temperature of bottom humidity sensor chamber(thum_bot)
• lat(lat)
• bottom vapor pressure(vp_bot)
• lon(lon)
• top air temperature(tair_top)
• scalar wind speed(wind_s)
• vector wind speed(res_ws)
• Bottom humidity(hum_bot)
• Home signal(home)
• net radiation(q)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• Time offset of tweaks from base_time(time_offset)
• Dummy altitude for Zeb(alt)
• base time(base_time)
• Top humidity(hum_top)
• bottom air temperature(tair_bot)
• wind direction (relative to true north)(wind_d)

• null(Raw data stream - documentation not supported)

• 5 cm soil heat flow, site 1(shf1)
• net radiation(q)
• Soil heat capacity 4(cs4)
• 5 cm soil heat flow, site 3(shf3)
• Soil heat capacity 1(cs1)
• Soil heat capacity 2(cs2)
• Exchange mechanism position indicator (15 to 30 min)(home_30)
• top vapor pressure(vp_top)
• Temperature of the top humidity chamber(thum_top)
• latent heat flux(e)
• 0-5 cm change in soil heat storage with time, site 2(ces1)
• 0-5 cm integrated soil temperature, site 2(ts1)
• wind direction (relative to true north)(wind_d)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• lon(lon)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• average surface soil heat flow(ave_shf)
• standard deviation of wind direction (sigma theta)(sigma_wd)
• 5 cm soil heat flow, site 2(shf2)
• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• Soil heat capacity 3(cs3)
• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm change in soil heat storage with time, site 2(ces2)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• Dummy altitude for Zeb(alt)
• Soil heat capacity 5(cs5)
• volumetric soil moisture, site 3(sm3)
• 5 cm soil heat flow, site 4(shf4)
• volumetric soil moisture, site 4(sm4)
• 0-5 cm integrated soil temperature, site 4(ts4)
• soil heat flow, site 2(g2)
• 5 cm soil heat flow, site 5(shf5)
• Time offset of tweaks from base_time(time_offset)
• volumetric soil moisture, site 1(sm1)
• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)
• h(h)
• soil heat flow, site 4(g4)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• base time(base_time)
• top air temperature(tair_top)
• volumetric soil moisture, site 2(sm2)
• scalar wind speed(wind_s)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 1(g1)
• 0-5 cm integrated soil temperature, site 5(ts5)
• Retrieved pressure profile(pres)
• 0-5 cm change in soil heat storage with time, site 5(ces5)
• 0-5 cm change in soil heat storage with time, site 4(ces4)
• soil heat flow, site 5(g5)
• vector wind speed(res_ws)
• soil heat flow, site 3(g3)
• lat(lat)
• 0-5 cm integrated soil temperature, site 3(ts3)
• volumetric soil moisture, site 5(sm5)
• Exchange mechanism position indicator (0 to 15 min)(home_15)
• 0-5 cm integrated soil temperature, site 2(ts2)

• Home signal(mv_home)
• Dummy altitude for Zeb(alt)
• Soil moisture 5(r_sm5)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil heat flow 3(mv_hft3)
• Soil moisture 3(r_sm3)
• Soil heat flow 2(mv_hft2)
• Net radiation(mv_q)
• Left air temperature(tair_l)
• lat(lat)
• Soil heat flow 4(mv_hft4)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Battery(bat)
• Soil temperature 3(rr_ts3)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• lon(lon)
• Soil moisture 4(r_sm4)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Right air temperature(tair_r)
• Soil moisture 1(r_sm1)
• Soil heat flow 5(mv_hft5)
• Wind direction (relative to true north)(mv_wind_d)
• Soil moisture 2(r_sm2)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 5(rr_ts5)
• Soil heat flow 1(mv_hft1)
• Soil temperature 4(rr_ts4)
• scalar wind speed(wind_s)
• Signature(signature)
• Atmospheric pressure(mv_pres)
• Reference temperature(rr_tref)

SGP/EBBR/E12 - Temperature, RH, and Vapor Pressure Data Incorrect

The right aspirator housing fell off of the AEM around 1345 GMT, by looking
at the data.  The housing was put back into place later in the day during 
a PM visit.  The following values were affected:

5 minute:  tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top,
           vp_bot
15 minute: rr_thum_r, mv_hum_r, tair_r
30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top,
           vp_bot, bowen, e, h

• Top humidity(hum_top)
• bottom vapor pressure(vp_bot)
• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• top vapor pressure(vp_top)
• Bottom humidity(hum_bot)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• Bottom humidity(hum_bot)
• Top humidity(hum_top)
• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• latent heat flux(e)
• h(h)
• top air temperature(tair_top)

• Temperature of right humidity sensor chamber(rr_thum_r)
• Right air temperature(tair_r)
• Right relative humidity(mv_hum_r)

SGP/EBBR/E12 - All Temperature Measurements Incorrect

Failure of the multiplexer connection for the reference temperature 
thermocouple in the control box or a problem with the Campbell CR10
bridge circuitry caused all air and soil temperature measurements
to be incorrect. Therefore, the computed 30 minute bowen, e, and h were 
also incorrect.

• bottom air temperature(tair_bot)
• Reference Thermistor Temperature(tref)
• top air temperature(tair_top)
• Temperature of the top humidity chamber(thum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

• 0-5 cm integrated soil temperature, site 2(ts1)
• 0-5 cm integrated soil temperature, site 4(ts4)
• 0-5 cm integrated soil temperature, site 5(ts5)
• Reference Thermistor Temperature(tref)
• Temperature of bottom humidity sensor chamber(thum_bot)
• bottom air temperature(tair_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• h(h)
• Temperature of the top humidity chamber(thum_top)
• 0-5 cm integrated soil temperature, site 3(ts3)
• latent heat flux(e)
• top air temperature(tair_top)
• 0-5 cm integrated soil temperature, site 2(ts2)

• Left air temperature(tair_l)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil temperature 4(rr_ts4)
• Right air temperature(tair_r)
• Soil temperature 1(rr_ts1)
• Soil temperature 2(rr_ts2)
• Soil temperature 3(rr_ts3)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Soil temperature 5(rr_ts5)
• Reference temperature(rr_tref)

SGP/EBBR/E12 - RH top Data Zero

The one data value hum_top was incorrect in the 30 minute data.  5 and 15
minute data were not affected, and the 30 minute flux data was not affected.
The data value may have been lost in remote data retrieval, resulting in
a zero value instead.

• Top humidity(hum_top)