SGP/EBBR - EBBR E2 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(mv_q)

• net radiation(q)

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

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/E2 - EBBR E2 Half Hour Incorrect

During one half hour period all data is incorrect.  The problem appears to
be just a bad record as the two 15 minute periods during the half hour were
not affected.  The cause of the problem is unknown.

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

SGP/EBBR/E2 - Reprocess: E2 Soil Heat Flow #4 Incorrect - Replaced

Soil heat flow probe #4 produced intermittently large positive
and negative values from October 1997 until 3 January 1998, after
which the values remained high until the probe was replaced on
8 January 1998 at 1711 GMT.

The following data values were affected for the period listed
above (when soil heat flow #4 was large):

15 minute: mv_hft4
30 minute: shf4, c_shf4, g4, ave_shf, e, h

• Soil heat flow 4(mv_hft4)

• latent heat flux(e)
• 5 cm soil heat flow, site 4(shf4)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 4(g4)
• h(h)

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/E2 - EBBR E2 Wind Direction Sensors Frozen

Wind direction sensors were frozen stalled during this period.
Wind direction from 0630 through 1100 GMT.  Data values that 
were affected were:

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

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

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

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

SGP/EBBR/E2 - EBBR E2 Incorrect Data

During the indicated period, when either home signal is in the hundreds, all
soil heat fluxes, soil moistures, net radiation, air temperatures, bowen 
ratio, sensible heat flux, and latent heat flux are incorrect.  This 
condition usually results from an AEM circuit problem that allows the home 
signals to go high and corrupts the data.  The cause has never been 
determined.

Comments added by Marv Wesely: 
David Cook said that this is a very rare occurence; it's happened about
three times in total for all EBBRs.  The problem might be on the circuit
boards (moisture?), but that is only a guess. The problem has always
disappeared by itself after a while.

• Soil heat flow 1(mv_hft1)
• Soil moisture 3(r_sm3)
• Soil heat flow 4(mv_hft4)
• Net radiation(mv_q)
• Soil moisture 5(r_sm5)
• Soil heat flow 2(mv_hft2)
• Soil heat flow 3(mv_hft3)
• Right air temperature(tair_r)
• Soil moisture 4(r_sm4)
• Soil moisture 1(r_sm1)
• Left air temperature(tair_l)
• Soil heat flow 5(mv_hft5)
• Soil moisture 2(r_sm2)

• bottom air temperature(tair_bot)
• top air temperature(tair_top)
• net radiation(q)

• latent heat flux(e)
• 5 cm soil heat flow, site 2(shf2)
• bottom air temperature(tair_bot)
• soil heat flow, site 3(g3)
• volumetric soil moisture, site 3(sm3)
• soil heat flow, site 2(g2)
• ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
• top air temperature(tair_top)
• 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
• 5 cm soil heat flow, site 4(shf4)
• 5 cm soil heat flow, site 5(shf5)
• 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
• soil heat flow, site 5(g5)
• net radiation(q)
• volumetric soil moisture, site 5(sm5)
• 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
• volumetric soil moisture, site 4(sm4)
• 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
• 5 cm soil heat flow, site 3(shf3)
• volumetric soil moisture, site 1(sm1)
• soil heat flow, site 1(g1)
• volumetric soil moisture, site 2(sm2)
• average surface soil heat flow(ave_shf)
• 5 cm soil heat flow, site 1(shf1)
• soil heat flow, site 4(g4)
• 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
• h(h)

SGP/EBBR/E2 - EBBR E2 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 indicated.

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

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

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

SGP/EBBR/E2 - EBBR E2 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.

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

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

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

SGP/EBBR/E2 - EBBR E2 Net Radiation Incorrect - Water in Bottom Dome

Water entered the net radiometer top dome through a hole made, probably,
by migrating birds (this happens every Spring and Autumn) and accumulated
in the bottom dome.  This causes nighttime net radiations to be too large
and daytime net radiations to be too small.  The data are therefore incorrect.

• Net radiation(mv_q)

• net radiation(q)

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

SGP/EBBR/E2 - EBBR E2 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)

• scalar wind speed(wind_s)

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

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

SGP/EBBR/E2 - Wind Speed Iced, Data Incorrect

The wind speed sensor was stopped by icing.  Wind speed data are incorrect.
The values are:

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

• null(Raw data stream - documentation not supported)

• scalar wind speed(wind_s)

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

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