SGP/EBBR - EBBR E15 Anemometer Cup Off, Wind Speed Incorrect

An anemometer cup fell off.

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 E15 Air Temperatures Incorrect

When the reference temperature sensor was being replaced, the left and
right thermocouple air temperatures and humidity probe temperatures 
were incorrect.

Affected data values were:

5 Minute:  tref, tair_top, tair_bot, thum_top, thum_bot, vp_top, vp_bot
15 minute: rr_tref, rr_thum_l, rr_thum_r, tair_r, tair_l
30 minute: tref, tair_top, tair_bot, thum_top, thum_bot, vp_top, vp_bot,
           bowen, e, h

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

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

• Temperature of left humidity sensor chamber(rr_thum_l)
• Reference temperature(rr_tref)
• Left air temperature(tair_l)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Right air temperature(tair_r)

Incorrect readings for pressure sensor

ARM PROBLEM IDENTIFICATION FORM (PIF)

                            PIF No. P940105.1

Subject:  SGP/Ebbr - Incorrect readings for pressure sensor at E15

Submitted By:        David R. Cook
    Organization:    Argonne National Laboratory
    Date Submitted:  December 13, 1993

How may we contact you?
    e-mail:  cook@anler.er.anl.gov
    phone:   (708) 252-5840
    FAX:     (708) 252-9792

Submitter's Priority: 3
    [Critical-1   Very Important-2 Important-3 Inconvenient-4 Interesting-5]

Where was this Problem Identified:  DA
    [Site Data System-SDS      Experiment Center-EC]
    [Archive-A At              Field Instrument-FI ]
    [During Data Analyis-DA    Other- List Location]

Does this PIF result in a Software Change Request?  No
    Where:                     [ SDS,  EC, or  A ]

    Type:                      [Development-1 Problem-2  Enhancement-3]

    List Programs/Documents Affected:

    Configuration Identification:

Does problem impact data values or cause data loss?  Data values.
    which platform(s): EBBR, E15, Ringwood, OK

    Specify (or estimate) begin and end dates
          Begin Date   7/11/93
          End   Date  12/01/93   Time  1830 GMT

    Apparent cause of data loss, if known:

    SUGGESTED CAUSES:   Calibration Drift.
    [human error, component failure, temperature, lightning          ]
    [foreign matter, power loss, software failure,                   ]
    [communications failure, modification difficulites, specify other]


Problem Description/Change Description.

o For Instrument Problems ONLY,
        Identify MODE of Operation: Normal

o Give a brief explanation with details, attach examples and any supporting
  information.  This should include a description of analysis leading to
  identification of problem and, if known, recommended action.


Beginning July 11, 1993, the atmospheric pressure sensor at the E15
EBBR began indicating approximately 0.2 KPa lower than the colocated SMOS.
Between July 31 and August 22, 1993 the difference increased to between
0.25 and 0.30 KPa.  After August 22, the difference increased to 0.3 to
0.35 KPa and remained that way until December 1, 1993.  A comparison of the
EBBR pressure sensor with the portable standard on December 1, 1993
indicated that the EBBR sensor was 0.04 KPa higher than the standard; this
is excellent agreement considering that the uncertainty of the EBBR sensor
calibration is 0.15 KPa.  The consistent bias in EBBR pressure between July 11
and December 1 can be easily detected in comparisons with SMOS pressure data.
No EBBR data other than pressure was affected by the pressure problem;
calculations of specific heat at constant pressure (which includes the term
1/(p-vp)) times other terms (including p-.378*vp) result in no error to the
third decimal point at least in the resulting Bowen Ratio.  For example;
assume a common vapor pressure (vp) of 2.0 kPa, a common atmospheric pressure
of 97.0 kPa, and a corrupted atmospheric pressure of 96.65 kPa at the extreme.

       Uncorrupted                               Corrupted

(97.0-.378*2.0)/(97.0-2.0) = 1.0131   (96.65-.378*2.0)/(96.65-2.0) = 1.0131

   1.0131/1.0131 = 1.0000    There is no effect on the Bowen Ratio as a
                                       result of the corruption.

Therefore, no correction to the quantities calculated using pressure is
needed.

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

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

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

SGP/EBBR/E15 - Questionable data due to low voltage at E15

On November 11, 1993 at 0300 GMT the voltage level of the battery for the
EBBR at Ringwood (E15) dropped to too low a level for most of the
sensors to perform properly.  By 0700 GMT virtually all sensors were not
indicating properly.  This condition continued through 1830 GMT on November
15, 1993.  No data from this EBBR should be considered valid during the
period indicated, since the quality of data from all sensors is
questionable.

• Soil temperature 5(rr_ts5)
• Signature(signature)
• scalar wind speed(wind_s)
• lon(lon)
• Atmospheric pressure(mv_pres)
• Soil temperature 3(rr_ts3)
• Dummy altitude for Zeb(alt)
• Soil heat flow 4(mv_hft4)
• lat(lat)
• Soil moisture 5(rr_sm5)
• Soil temperature 2(rr_ts2)
• Temperature of right humidity sensor chamber(rr_thum_r)
• Time offset of tweaks from base_time(time_offset)
• Right relative humidity(mv_hum_r)
• Soil moisture 1(rr_sm1)
• Soil temperature 1(rr_ts1)
• Reference temperature(rr_tret)
• Net radiation(mv_q)
• Soil moisture 2(rr_sm2)
• Right air temperature(tair_r)
• Temperature of left humidity sensor chamber(rr_thum_l)
• Soil heat flow 1(mv_hft1)
• Soil heat flow 2(mv_hft2)
• Left relative humidity(mv_hum_l)
• base time(base_time)
• Home signal(mv_home)
• Wind direction (relative to true north)(mv_wind_d)
• Soil heat flow 3(mv_hft3)
• Soil temperature 4(rr_ts4)
• Soil heat flow 5(mv_hft5)
• Left air temperature(tair_l)
• Soil moisture 3(rr_sm3)
• Soil moisture 4(rr_sm4)
• Battery(bat)

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

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

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/E15 - Frozen Wind Speed Instrument

On December 31, 1994 EBBR wind speed instrument froze in place from icing.
Wind speeds increased sufficiently on January 1, 1995 to break the
anemometer free.  The wind direction instrument was not affected.  The times
and fields that are incorrect are shown below.

5 minute:  wind_s, res_ws  12/31 2140 GMT - 1/1 1705 GMT
15 minute: wind_s          12/31 2145 GMT - 1/1 1715 GMT
30 minute: wind_s, res_ws  12/31 2200 GMT - 1/1 1730 GMT

• 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/E15 - Battery Voltage Drop, Storage Module Change

For a short period on June 6, 1995 at E15, Ringwood, OK, two events
resulted in a loss of data: replacement of the storage module and a low
battery condition.  The low battery condition apparently affected only the
1815 GMT data output.  All data during this period is missing (1645-1800
GMT) of incorrect (1815-1830).

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

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

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

SGP/EBBR/E15 - Frozen Wind Speed Sensor

On March 7, 1995 freezing rain stopped the cups of the EBBR wind
speed instrument at Ringwood, OK (E15).  All 5, 15, and 30
minute data values indicated below are incorrect for the period indicated.

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/E15 - AEM Home 15 Values High

Beginning on June 23, 1995, the home 15 value indicated greater than 70 at
times.  This indicates that the home 15 and 30 outputs are somehow being
electronically added in the AEM.  Home 15 values above 70 cause a data quality
message to be output in the site operations log as the stated acceptable range
for home 15 is 35 to 70.  However, no data is incorrect as a result of this
condition.

No replacement AEM is available and site operations was not able to
diagnose the problem.  At present, data quality is not jeopardized.

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

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

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

SGP/EBBR/E15 - AEM Not Exchanging

On August 27, 1995 at approximately 1615 GMT the upper sprocket shaft of the AEM
broke in two, causing the AEM to stop exchanging.  The home signal values
then remained at around 22 for both home_15 and Home_30.  On August 28 site
operations personnel removed the fuse (to prevent exchange) with the left
aspirator in the down position.  The home signal values remained around
-2.3 after that. The AEM will remain in this condition until a replacement
is available.

Therefore, the calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect for all times after August 27, 1995 at 1615 GMT.  The data
fields listed below are incorrect after this time:

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

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

It is not possible to reliably calculate the Bowen ratio, e, and h using the
15 minute data.

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

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

SGP/EBBR/E15 - AEM Replaced

Please see DQR P950908.1, where this problem was first documented.

On August 27, 1995 at approximately 1615 GMT the upper sprocket shaft of the AEM
broke in two, causing the AEM to stop exchanging.  The home signal values
then remained at around 22 for both home_15 and Home_30.  On August 28 site
operations personnel removed the fuse (to prevent exchange) with the left
aspirator in the down position.  The home signal values remained around
-2.3 after that.  On 14 September 1995, site operations personnel replaced
the AEM (serial numbers unknown) and it has operated correctly since then.

The calculations of Bowen ratio, latent heat flux, and sensible heat
flux are incorrect for all times during the period listed above.  The data
fields listed below are incorrect:

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

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

It is not possible to reliably calculate the Bowen ratio, e, and h using the
15 minute data.

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

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

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/E13 - AEM Exchange Stopped in Snow and Freezing Rain

On the night of November 10-11, a north-south line from south central
Kansas through south central Oklahoma received snow and freezing rain and experienced
below freezing temperatures.  This caused the EBBR automatic exchange mechanism (AEM) to
stop exchanging temporarily.   

Note that temperatures, relative humidities, and vapor pressures are not affected; these
are correct as measured, but the height at which the measurements occurred must be
determined from the home signal value.

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

SGP/EBBR/E15 - Annual calibration changeout

On December 14, 1995 the changeout for annual calibration occurred at E15,
Ringwood, OK.  Between 1650 and 2050 GMT no data was remotely collected.
Furthermore, 5 minute data for 2050 GMT is incorrect, 15 minute data for
2045 GMT is incorrect, and 30 minute data for 2100 GMT is incorrect.
A rather large jump in soil moisture appears in the data after the
installation was completed (the bags holding the probes were soaked with water
before installation).  Soil measurements indicated greater than ambient
soil moisture  until a rain on late 18 December saturated the soil; after this
period the probes reflected actual soil moisture conditions.  The larger than
normal soil moistures have little impact on the small soil heat flux during
this time of year, and thus no significant affect on computed sensible and
latent heat fluxes.

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

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

SGP/EBBR/E15 - Wind Speed Cups Frozen

Freezing rain, snow, and below freezing conditions during 18-19 January
1995 caused the wind speed sensor cups to freeze in a stopped state at E15,
Ringwood, OK on 18 January 1995.  When temperatures rose to above freezing on
19 January, 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/E15 - Reprocess: Soil Temperature Probe Malfunction

Malfunction of soil temperature probe #3 at 157, Ringwood, OK resulted in
incorrect data values for 7 fields for the period of time listed above.  The
soil temperature value from probe #3 went offscale, resulting in a zero value
for the soil energy storage term calculated from that probe and thus no
contribution to the total soil heat flux for soils set 4 and the same for
average soil heat flux.  This led to incorrect sensible and latent heat
flux values.  The probe may have become disconnected during the 20 December
site operations preventative maintenance visit.  However, it also had
rodent chew damage and so was removed and replaced.

The fields that are incorrect are:

30 minute: ts3, ces3, g3, ave_shf, e, h

15 minute: rr_ts3.

Soil temperature probe #3 was replaced at 2030 GMT on 16 January 1996.
The old S/N was 95043, the new S/N is 93018.  Sensible and latent heat fluxes
can be recomputed by averaging the soil heat flux from the four sets of
functioning soil probes; use the following equations:

ave_shf = (g1 + g2 + g4 + g5)/4

e = -(q +ave_shf)/(1 + bowen)

h = e * bowen,

where g is total soil heat flow, q is net radiation, and bowen is Bowen
Ratio.

• 0-5 cm change in soil heat storage with time, site 3(ces3)
• 0-5 cm integrated soil temperature, site 3(ts3)
• h(h)
• soil heat flow, site 3(g3)
• latent heat flux(e)
• average surface soil heat flow(ave_shf)

• Soil temperature 3(rr_ts3)

SGP/EBBR/E15 - Battery Voltage Drop

From the installation of the changeout unit at E15 on 15 December 1995, the
battery exhibited a slow decline in voltage. However, after a day of the
AEM not operating, site operations restarted the AEM on 20 December 1995 and
the battery condition declined more rapidly, such that the solar panel was not
able to keep the battery voltage up (greater than 11 V DC) for nighttime
conditions, even after a cloudless day.  Battery voltage first dropped below 11
volts at 0635 GMT on 21 December.  I requested that the solar panel voltage
regulator be tested.  On 16 January 1996, site operations found that the
fuse in the solar panel voltage regulator was loose.  After the fuse was
repositioned, the battery voltage increased almost immediately to 13.5
volts and has been good since.

All data for the periods above should be considered incorrect; many sensors
require at least 11 volts DC power and the performance of the CR10 data
logger can not be trusted at less than 11 volts.

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

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

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

SGP/EBBR/E15 - 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 air temperature(tair_bot)
• Bottom humidity(hum_bot)
• top air temperature(tair_top)
• Temperature of the top humidity chamber(thum_top)
• bottom vapor pressure(vp_bot)
• top vapor pressure(vp_top)
• Top humidity(hum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

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

• Temperature of left humidity sensor chamber(rr_thum_l)
• Right air temperature(tair_r)
• Left relative humidity(mv_hum_l)
• Right relative humidity(mv_hum_r)
• Left air temperature(tair_l)
• Temperature of right humidity sensor chamber(rr_thum_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/E15 - Wind Speed Cups frozen

Freezing rain, snow, and below freezing conditions during 18-19 January 
1995 caused the wind speed sensor cups to freeze in a stopped state at E15, 
Ringwood, OK on 18 January 1995.  When temperatures rose to above freezing on 
19 January, 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/E15 - Connections Affecting Home Signals

For most of the period above at E15, Ringwood, OK, home signals were very
large, resulting in incorrect data.  On April 22, 1997, site operations found 
some loose connections on the J-panels that were causing the problem.  This
problem affected a wide range of measurements and calculated values, 
rendering much of the data, including the sensible and latent heat fluxes 
as incorrect.  Only careful examination of the data would allow some to be 
used as is and other quantities to be recalculated.  I would request that 
anyone needing this data contact me for information on it's quality.

• Home signal(home)

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

• Home signal(mv_home)

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/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/E15 - Wind Speed Sensor Frozen

The wind speed sensor was frozen during the period.  

Data values that were incorrect are:

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

• null(Raw data stream - documentation not supported)

• 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/E15 - 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 air temperature(tair_bot)
• Bottom humidity(hum_bot)
• top air temperature(tair_top)
• Temperature of the top humidity chamber(thum_top)
• bottom vapor pressure(vp_bot)
• top vapor pressure(vp_top)
• Top humidity(hum_top)
• Temperature of bottom humidity sensor chamber(thum_bot)

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

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

SGP/EBBR/E15 - Pressure Diurnal Fluctuations

During this period the barometric pressure exhibited increasingly larger,
and unatural, diurnal fluctuations.  This has been observed at other sites
previously.  The sensor was replaced on April 21.  The diurnal fluctuations
had only a minor effect on the calculated fluxes of latent and sensible
heat; the fluxes are not incorrect as a result of the problem.

• h(h)
• latent heat flux(e)

SGP/EBBR/E15 - Pressure Too High

During this period the barometric pressure was consistently much greater
than the true pressure, hanging around 113 kPa all of the time.
The defective sensor was replaced on April 28. The calculated fluxes of 
latent and sensible heat are incorrect during the period.

• Retrieved pressure profile(pres)

• h(h)
• Retrieved pressure profile(pres)
• latent heat flux(e)

• Atmospheric pressure(mv_pres)

SGP/EBBR/E15 - Left T/RH Probe Temperature Too Large

Beginning in February, the temperature of the left T/RH probe reported too
high a value at some times.  The frequency of the problem increased with
time until 28 April at 1520 GMT, when a defective probe was installed; the
latter probe temperature indicated very high values.  This continued until
1 May at 1530 GMT when a working probe was installed. Times of incorrect 
humidity probe temperatures can be determined by comparing 5 or 30 minute 
values of air temperature and humidity probe temperature; at these times the 
calculated bowen ratio, and the fluxes of latent and sensible heat are 
incorrect.

The incorrect variables were:

5  minute:  thum_top, thum_bot, vp_top, vp_bot
15 minute:  rr_thum_l
30 minute:  thum_top, thum_bot, vp_top, vp_bot, bowen, e, h

• Temperature of the top humidity chamber(thum_top)
• top vapor pressure(vp_top)
• bottom vapor pressure(vp_bot)
• Temperature of bottom humidity sensor chamber(thum_bot)

• Temperature of bottom humidity sensor chamber(thum_bot)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• Temperature of the top humidity chamber(thum_top)
• h(h)
• top vapor pressure(vp_top)
• latent heat flux(e)
• bottom vapor pressure(vp_bot)

• Temperature of left humidity sensor chamber(rr_thum_l)

SGP/EBBR/E15 - 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 above.

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

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

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

SGP/EBBR/E15 - Aspirator loosened from AEM mount

The left aspirator was loosened from the AEM mount.  Thus all gradients
of T/RH/VP and sensible and latent heat fluxes for the period are 
incorrect.  T/RH/VP measurements from the left probe are incorrect only
through 1745 GMT.

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

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

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

SGP/EBBR/E15 - 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

• 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)(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/E15 - 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,

• null(Raw data stream - documentation not supported)

• 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 E15 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,

• null(Raw data stream - documentation not supported)

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

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

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

SGP/EBBR - EBBR E15 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,

• null(Raw data stream - documentation not supported)

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

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

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

SGP/EBBR/E15 - Temperatures Incorrect

Poor contact of the reference temperature probe leads to the J-panel or
multiplexer caused frequent offscale and incorrect values of the reference
temperature.  All other temperature measurements (air, soil, and humidity 
probe) depend on the reference temperature for a correction.  Therefore all
temperature measurements are frequently offscale and incorrect during the 
specified period.  The data clearly shows the offscale times.

• Reference Thermistor Temperature(tref)
• bottom air temperature(tair_bot)
• 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)
• Reference Thermistor Temperature(tref)
• Temperature of the top humidity chamber(thum_top)
• 0-5 cm integrated soil temperature, site 3(ts3)
• top air temperature(tair_top)
• 0-5 cm integrated soil temperature, site 5(ts5)
• 0-5 cm integrated soil temperature, site 4(ts4)
• Temperature of bottom humidity sensor chamber(thum_bot)
• 0-5 cm integrated soil temperature, site 2(ts2)
• bottom air temperature(tair_bot)

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