DQR ID | Subject | Data Streams Affected |
---|
D000211.10 | SGP/EBBR - EBBR E20 Data Incorrect from SHF #5 | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D000211.12 | SGP/EBBR - EBBR E20 Thermocouple Data Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D000228.1 | SGP/EBBR - EBBR E20 Right Air Temperature Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D000303.1 | SGP/EBBR - EBBR E20 Left Air Temperature Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D940105.2 | SGP/EBBR/E20 - Blown fuse in AEM at E20 | sgp15ebbrE20.a0, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D940105.7 | SGP/EBBR/E22 - Incorrect averaging interval at E22 | sgp30ebbrE22.a1 |
D940105.8 | SGP/EBBR/E20 - Reprocess: Questionable data in soil heat fluxes at E20 | sgp15ebbrE20.a0, sgp30ebbrE20.a1 |
D940329.2 | SGP/EBBR/E20 - Pressure Sensor Malfunction | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D940616.4 | SGP/EBBR/E20 - Soil Moisture Probe | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D940921.1 | SGP/EBBR/E20 - Fan Stopped, T and RH Biases | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D941021.1 | SGP/EBBR/E20 - Soil Moisture Probe Failure | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D941021.2 | SGP/EBBR/E20 - Aspirator Fan Stoppage | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D941021.3 | | |
D941221.1 | SGP/EBBR/E26 - T/RH Check | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
D950626.4 | SGP/EBBR/E20 - Frozen Wind Speed Sensor | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D950803.2 | SGP/EBBR/E20 - Reprocess: Soil Temperature Malfunction | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D950815.3 | SGP/EBBR/E20 - Annual Calibration Changeout | sgp30ebbrE20.a1 |
D950816.4 | SGP/EBBR/E20 - AEM Home 30 Values Low | sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D951020.1 | SGP/EBBR/E9 - 3-month Check | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
D951116.1 | SGP/EBBR/E13 - AEM Exchange Stopped in Snow and Freezing Rain | sgp30ebbrE13.a1 |
D951116.2 | SGP/EBBR/E20 - Soil Heat Flow Zero Under Unchanging Conditions | sgp30ebbrE20.a1 |
D960502.1 | SGP/EBBR/E20 - Temperature/RH Probes Malfunction and Replacement | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.00, sgp5ebbrE20.a0 |
D960508.8 | SGP/EBBR/E20 - 3-month check | sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D961122.17 | SGP/EBBR/E20 - Incorrect Data from Left Humidity Probe | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D961122.19 | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
D970330.5 | SGP/EBBR/E20 - Wind Speed Cups Frozen | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D970729.1 | SGP/EBBR/E20 - Reprocess: E20 Soil Probes #3 Cables Cut | sgp15ebbrE20.a1, sgp30ebbrE20.a1 |
D971021.1 | SGP/EBBR/E7 - EBBR Biannual Checks | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
D980117.4 | | |
D980117.5 | SGP/EBBR/E26 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
D980410.10 | SGP/EBBR/E20 - Wind Speed Sensor Frozen | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.00, sgp5ebbrE20.a0 |
D980413.2 | | |
D980416.16 | SGP/EBBR/E20 - 3 Month Check | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D980529.14 | SGP/EBBR/E20 - Six Month Checks | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D980731.2 | SGP/EBBR/E20 - Wind Speed Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D981113.1 | SGP/EBBR/E20 - Incorrect Data - Cattle Vandalism | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D990127.25 | SGP/EBBR/E20 - Wind Direction Data Incorrect (revised) | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D990127.29 | SGP/EBBR/E20 - Wind Direction Data Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D990127.40 | SGP/EBBR/E20 - Wind Speed Data Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D990127.41 | SGP/EBBR/E20 - Wind Speed Data Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D990129.8 | SGP/EBBR/E20 - Data Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.00, sgp5ebbrE20.a0 |
D990218.2 | SGP/EBBR/E20 - Pressure Low | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
D990315.1 | SGP/EBBR/E20 - Right Relative Humidity Offset Low | sgp15ebbrE20.a1 |
D990415.3 | SGP/EBBR/E20 - Air Temperature Incorrect | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0 |
Subject: | SGP/EBBR/E20 - Blown fuse in AEM at E20 |
DataStreams: | sgp15ebbrE20.a0, sgp30ebbrE20.a1, sgp5ebbrE20.a0
|
Description: | On October 30, 1993, before 1300 GMT, the fuse in the AEM (Automatic
Exchange Mechanism) of Meeker, Ok (E20) EBBR blew out. The AEM remained
nonfunctional until the fuse was replaced just before 1600 GMT on
November 12, 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
If the biases of the sensors were know, bowen, h, and e could be
recalculated from the 15 minute and/or 5 minute data. Since we will not
have any idea of what those biases are until an annual calibration of the
sensors can take place (which may be months away), the recalculations
cannot be performed at this time. Furthermore, it may be invalid to use
sensor biases, if determined too far removed in time, due to the gradual
calibration drift of some of the sensors. |
Measurements: | sgp15ebbrE20.a0: - Right air temperature(tair_r)
- Home signal(mv_home)
- Temperature of right humidity sensor chamber(rr_thum_r)
- Left relative humidity(mv_hum_l)
- Left air temperature(tair_l)
- Right relative humidity(mv_hum_r)
- Temperature of left humidity sensor chamber(rr_thum_l)
sgp30ebbrE20.a1: - Bottom humidity(hum_bot)
- Temperature of the top humidity chamber(thum_top)
- bottom vapor pressure(vp_bot)
- top air temperature(tair_top)
- Exchange mechanism position indicator (15 to 30 min)(home_30)
- top vapor pressure(vp_top)
- h(h)
- ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
- Top humidity(hum_top)
- Temperature of bottom humidity sensor chamber(thum_bot)
- latent heat flux(e)
- bottom air temperature(tair_bot)
- Exchange mechanism position indicator (0 to 15 min)(home_15)
sgp5ebbrE20.a0: - Temperature of the top humidity chamber(thum_top)
- Bottom humidity(hum_bot)
- bottom air temperature(tair_bot)
- bottom vapor pressure(vp_bot)
- top air temperature(tair_top)
- Top humidity(hum_top)
- Home signal(home)
- Temperature of bottom humidity sensor chamber(thum_bot)
- top vapor pressure(vp_top)
|
Subject: | SGP/EBBR/E22 - Incorrect averaging interval at E22 |
DataStreams: | sgp30ebbrE22.a1
|
Description: | On November 9, 1993 version 4 of the EBBR program installed at Cordell, OK
(E22) was mistakenly modified in one area during the process of modifying a
calibration in another part of the program. The mistaken modification was
a change in the execution interval from 30 seconds to 10 seconds. This
modification remained in the program until November 22, 1993 when it was
discovered and changed back to a 30 second execution interval. The
modification produced no ill effects as the execution interval only
changes sampling and averaging periods. A 10 second execution interval
results in three times as many samples being taken, which, when averaged,
should actually produce more accurate results. Therefore, data quality was
not affected. This PIF was written only to document the fact that the
mistaken modification was made, and when it was made. |
Measurements: | sgp30ebbrE22.a1: - Soil heat capacity 1(cs1)
- Retrieved pressure profile(pres)
- scalar wind speed(wind_s)
- ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
- Bottom humidity(hum_bot)
- average surface soil heat flow(ave_shf)
- Reference Thermistor Temperature(tref)
- top vapor pressure(vp_top)
- soil heat flow, site 3(g3)
- 5 cm soil heat flow, site 3(shf3)
- Exchange mechanism position indicator (0 to 15 min)(home_15)
- soil heat flow, site 2(g2)
- Time offset of tweaks from base_time(time_offset)
- wind direction (relative to true north)(wind_d)
- Temperature of bottom humidity sensor chamber(thum_bot)
- 0-5 cm change in soil heat storage with time, site 3(ces3)
- Top humidity(hum_top)
- Dummy altitude for Zeb(alt)
- Soil heat capacity 5(cs5)
- 0-5 cm integrated soil temperature, site 4(ts4)
- Temperature of the top humidity chamber(thum_top)
- volumetric soil moisture, site 5(sm5)
- 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(ces2)
- soil heat flow, site 1(g1)
- net radiation(q)
- 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
- volumetric soil moisture, site 4(sm4)
- h(h)
- volumetric soil moisture, site 3(sm3)
- 5 cm soil heat flow, site 4(shf4)
- standard deviation of wind direction (sigma theta)(sigma_wd)
- bottom air temperature(tair_bot)
- 0-5 cm integrated soil temperature, site 5(ts5)
- soil heat flow, site 5(g5)
- 5 cm soil heat flow, site 1(shf1)
- lat(lat)
- volumetric soil moisture, site 1(sm1)
- 5 cm soil heat flow, site 2(shf2)
- Soil heat capacity 4(cs4)
- 0-5 cm integrated soil temperature, site 2(ts2)
- 5 cm soil heat flow, site 5(shf5)
- 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
- vector wind speed(res_ws)
- base time(base_time)
- volumetric soil moisture, site 2(sm2)
- 0-5 cm integrated soil temperature, site 3(ts3)
- 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
- bottom vapor pressure(vp_bot)
- latent heat flux(e)
- 0-5 cm integrated soil temperature, site 2(ts1)
- soil heat flow, site 4(g4)
- top air temperature(tair_top)
- 0-5 cm change in soil heat storage with time, site 2(ces1)
- Exchange mechanism position indicator (15 to 30 min)(home_30)
- Soil heat capacity 3(cs3)
- lon(lon)
- 0-5 cm change in soil heat storage with time, site 4(ces4)
- 0-5 cm change in soil heat storage with time, site 5(ces5)
- Soil heat capacity 2(cs2)
- 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
|
Subject: | SGP/EBBR/E20 - Fan Stopped, T and RH Biases |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.a0
|
Description: | Another fan stoppage situation occurred. This is the fourth one in the
last few months and may indicate a weakening of the fans that aspirate the
temperature, relative humidity housings. The 15 minute data reveals that
the stoppage occurred at approximately 1300 GMT on September 12. The left fan
was cleaned out by site operations personnel and began running again at
1847 GMT on September 14. The 15 minute data during this period shows that
during daytime, the left temperature was greater than the right temperature and
that the left relative humidity was lower than the right relative humidity
(a consequence of greater temperature), irregardless of the positions of the
housings. The bowen ratio, sensible heat flux and latent heat flux for this
period, as well as all left housing temperatures and relative humidities are
incorrect. The data values that are incorrect 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, thum_bot,
vp_top, vp_bot, bowen, e, h
Because of the increased frequency of fan stoppage occurrences, I have
submitted a work request to site operations to use the portable vane
anemometer to check the flow of the housing fans on each EBBR and visually
check (and clean if needed) the fans for debris that would restrict the
flow. Included in this work request are instructions for checking the
performance of the temperature and relative humidity sensors by
manually putting the aspirator housings at the same height for a half hour
period (so that two 15 minute and one half hour comparison result).
The latter part of the work request is prompted by my close inspection of
the Meeker data for the last few weeks. It is clear that significant
biases have developed in the pairs of temperature and relative humidity
sensors; left thermocouple ~0.5 deg. C greater than right thermocouple,
left relative humidity ~5% lower than right relative humidity. Biases were
expected in operating the systems over long time periods, and these appear
to be the result of simple offsets, not changes in calibrations.
At this point, I just want to determine how large the offsets are.
Comparison of these offsets between EBBR units, in light of the different
lengths of time that EBBR units and individual sensors have been deployed,
may provide some interesting information on likely offset changes with time. |
Measurements: | sgp30ebbrE20.a1: - Bottom humidity(hum_bot)
- ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
- Top humidity(hum_top)
- Temperature of the top humidity chamber(thum_top)
- Temperature of bottom humidity sensor chamber(thum_bot)
- bottom vapor pressure(vp_bot)
- top air temperature(tair_top)
- latent heat flux(e)
- top vapor pressure(vp_top)
- h(h)
- bottom air temperature(tair_bot)
sgp5ebbrE20.a0: - Temperature of the top humidity chamber(thum_top)
- bottom vapor pressure(vp_bot)
- Bottom humidity(hum_bot)
- top air temperature(tair_top)
- bottom air temperature(tair_bot)
- Top humidity(hum_top)
- Temperature of bottom humidity sensor chamber(thum_bot)
- top vapor pressure(vp_top)
sgp15ebbrE20.a1: - Left air temperature(tair_l)
- Left relative humidity(mv_hum_l)
- Temperature of left humidity sensor chamber(rr_thum_l)
|
Subject: | SGP/EBBR/E26 - T/RH Check |
DataStreams: | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0
|
Description: | 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. |
Measurements: | sgp15ebbrE26.a1: - 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)
sgp5ebbrE26.a0: - 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)
sgp30ebbrE26.a1: - 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)
|
Subject: | SGP/EBBR/E20 - AEM Home 30 Values Low |
DataStreams: | sgp30ebbrE20.a1, sgp5ebbrE20.a0
|
Description: | The first EBBR to achieve annual calibration changeout was Meeker, Ok, E20.
However, soon after changeout on August 9, 1995, the home 30 value dropped below
15, intermittently, to typically 0.3 to 0.5; 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. However, no data is incorrect as a result of this
condition.
No replacement AEM is available, as the changeout kit AEMs are somewhat
different from the initial units. Site operations hopes to have time to
diagnose the problem on the next PM visit and correct the problem. At
present, data quality is not jeopardized.
I will submit another DQR or addendum when successful replacement of the
AEM is accomplished. |
Measurements: | sgp30ebbrE20.a1: - soil heat flow, site 1(g1)
- Bottom humidity(hum_bot)
- 0-5 cm change in soil heat storage with time, site 4(ces4)
- volumetric soil moisture, site 1(sm1)
- 5 cm soil heat flow, site 1(shf1)
- 0-5 cm integrated soil temperature, site 3(ts3)
- top air temperature(tair_top)
- Exchange mechanism position indicator (15 to 30 min)(home_30)
- top vapor pressure(vp_top)
- 0-5 cm integrated soil temperature, site 4(ts4)
- 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
- soil heat flow, site 4(g4)
- 0-5 cm integrated soil temperature, site 5(ts5)
- average surface soil heat flow(ave_shf)
- volumetric soil moisture, site 5(sm5)
- standard deviation of wind direction (sigma theta)(sigma_wd)
- net radiation(q)
- 0-5 cm change in soil heat storage with time, site 3(ces3)
- 5 cm soil heat flow, site 2(shf2)
- ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
- Top humidity(hum_top)
- 5 cm soil heat flow, site 5(shf5)
- soil heat flow, site 5(g5)
- soil heat flow, site 2(g2)
- Retrieved pressure profile(pres)
- 0-5 cm change in soil heat storage with time, site 5(ces5)
- Time offset of tweaks from base_time(time_offset)
- Soil heat capacity 4(cs4)
- 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
- vector wind speed(res_ws)
- Reference Thermistor Temperature(tref)
- volumetric soil moisture, site 3(sm3)
- Exchange mechanism position indicator (0 to 15 min)(home_15)
- 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
- Dummy altitude for Zeb(alt)
- Soil heat capacity 3(cs3)
- volumetric soil moisture, site 4(sm4)
- volumetric soil moisture, site 2(sm2)
- Temperature of the top humidity chamber(thum_top)
- bottom vapor pressure(vp_bot)
- Soil heat capacity 2(cs2)
- soil heat flow, site 3(g3)
- lat(lat)
- Soil heat capacity 5(cs5)
- h(h)
- base time(base_time)
- wind direction (relative to true north)(wind_d)
- 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
- 0-5 cm integrated soil temperature, site 2(ts2)
- Temperature of bottom humidity sensor chamber(thum_bot)
- 5 cm soil heat flow, site 4(shf4)
- lon(lon)
- latent heat flux(e)
- 0-5 cm integrated soil temperature, site 2(ts1)
- Soil heat capacity 1(cs1)
- scalar wind speed(wind_s)
- 0-5 cm change in soil heat storage with time, site 2(ces1)
- 5 cm soil heat flow, site 3(shf3)
- bottom air temperature(tair_bot)
- 0-5 cm change in soil heat storage with time, site 2(ces2)
- 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
sgp5ebbrE20.a0: - vector wind speed(res_ws)
- Dummy altitude for Zeb(alt)
- bottom air temperature(tair_bot)
- base time(base_time)
- Retrieved pressure profile(pres)
- lat(lat)
- wind direction (relative to true north)(wind_d)
- bottom vapor pressure(vp_bot)
- Top humidity(hum_top)
- lon(lon)
- top vapor pressure(vp_top)
- Temperature of the top humidity chamber(thum_top)
- net radiation(q)
- Bottom humidity(hum_bot)
- Time offset of tweaks from base_time(time_offset)
- Reference Thermistor Temperature(tref)
- top air temperature(tair_top)
- standard deviation of wind direction (sigma theta)(sigma_wd)
- Temperature of bottom humidity sensor chamber(thum_bot)
- Home signal(home)
- scalar wind speed(wind_s)
|
Subject: | SGP/EBBR/E20 - Soil Heat Flow Zero Under Unchanging Conditions |
DataStreams: | sgp30ebbrE20.a1
|
Description: | This DQR is written to inform users of the data that the EBBR soil heat flow
measurements of zero during much of 11 November 1995 at E20, Meeker, OK are
correct values. Nearly unchanging conditions of net radiation, air
temperature, and soil moisture, plus high wind speeds and near neutral
atmospheric stability, resulted in almost unchanging conditions of
soil temperature and ten and a half hours of zero soil heat flow
output from all soil heat flow plates (some plates outputted zero for
longer than this). The change in energy storage (determined from the
change in temperature with time of the soil above the plates) was very
nearly zero also during the period of interest.
Such an extended period of zero soil heat flow and the accompanying
unchanging soil and atmospheric conditions is quite rare and therefore
worth noting here in case someone using the data might mistakenly think
that the data is incorrect. |
Measurements: | sgp30ebbrE20.a1: - soil heat flow, site 1(g1)
- Bottom humidity(hum_bot)
- 0-5 cm change in soil heat storage with time, site 4(ces4)
- volumetric soil moisture, site 1(sm1)
- 5 cm soil heat flow, site 1(shf1)
- 0-5 cm integrated soil temperature, site 3(ts3)
- top air temperature(tair_top)
- Exchange mechanism position indicator (15 to 30 min)(home_30)
- 0-5 cm integrated soil temperature, site 4(ts4)
- top vapor pressure(vp_top)
- 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
- soil heat flow, site 4(g4)
- 0-5 cm integrated soil temperature, site 5(ts5)
- average surface soil heat flow(ave_shf)
- volumetric soil moisture, site 5(sm5)
- standard deviation of wind direction (sigma theta)(sigma_wd)
- net radiation(q)
- 0-5 cm change in soil heat storage with time, site 3(ces3)
- 5 cm soil heat flow, site 2(shf2)
- ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
- Top humidity(hum_top)
- 5 cm soil heat flow, site 5(shf5)
- soil heat flow, site 5(g5)
- soil heat flow, site 2(g2)
- Retrieved pressure profile(pres)
- 0-5 cm change in soil heat storage with time, site 5(ces5)
- Time offset of tweaks from base_time(time_offset)
- Soil heat capacity 4(cs4)
- 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
- vector wind speed(res_ws)
- Reference Thermistor Temperature(tref)
- volumetric soil moisture, site 3(sm3)
- Exchange mechanism position indicator (0 to 15 min)(home_15)
- 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
- Dummy altitude for Zeb(alt)
- Soil heat capacity 3(cs3)
- volumetric soil moisture, site 4(sm4)
- volumetric soil moisture, site 2(sm2)
- Temperature of the top humidity chamber(thum_top)
- bottom vapor pressure(vp_bot)
- Soil heat capacity 2(cs2)
- soil heat flow, site 3(g3)
- lat(lat)
- Soil heat capacity 5(cs5)
- h(h)
- base time(base_time)
- wind direction (relative to true north)(wind_d)
- 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
- 0-5 cm integrated soil temperature, site 2(ts2)
- Temperature of bottom humidity sensor chamber(thum_bot)
- 5 cm soil heat flow, site 4(shf4)
- lon(lon)
- latent heat flux(e)
- 0-5 cm integrated soil temperature, site 2(ts1)
- Soil heat capacity 1(cs1)
- 0-5 cm change in soil heat storage with time, site 2(ces1)
- scalar wind speed(wind_s)
- 5 cm soil heat flow, site 3(shf3)
- bottom air temperature(tair_bot)
- 0-5 cm change in soil heat storage with time, site 2(ces2)
- 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
|
Subject: | SGP/EBBR/E20 - Data Incorrect |
DataStreams: | sgp15ebbrE20.a1, sgp30ebbrE20.a1, sgp5ebbrE20.00, sgp5ebbrE20.a0
|
Description: | Version 6 of the CR10 program was installed during this period instead of
version 7 (the initial version 7 program did not work). The calibrations
and coefficients in version 6 were incorrect; therefore all
data during this period is of questionable quality and e and h are clearly
incorrect. The correct version 7 program was installed on 29 Dec 1998. |
Measurements: | sgp5ebbrE20.00: - null(Raw data stream - documentation not supported)
sgp30ebbrE20.a1: - Bottom humidity(hum_bot)
- 0-5 cm change in soil heat storage with time, site 4(ces4)
- volumetric soil moisture, site 1(sm1)
- 5 cm soil heat flow, site 1(shf1)
- Exchange mechanism position indicator (15 to 30 min)(home_30)
- 5 cm soil heat flow corrected for soil moisture content, site 2(c_shf2)
- volumetric soil moisture, site 5(sm5)
- standard deviation of wind direction (sigma theta)(sigma_wd)
- net radiation(q)
- 5 cm soil heat flow, site 2(shf2)
- ratio of sensible/latent heat fluxes (Bowen ratio)(bowen)
- 5 cm soil heat flow, site 5(shf5)
- Top humidity(hum_top)
- soil heat flow, site 5(g5)
- Retrieved pressure profile(pres)
- 0-5 cm change in soil heat storage with time, site 5(ces5)
- Time offset of tweaks from base_time(time_offset)
- volumetric soil moisture, site 3(sm3)
- Exchange mechanism position indicator (0 to 15 min)(home_15)
- Dummy altitude for Zeb(alt)
- volumetric soil moisture, site 2(sm2)
- bottom vapor pressure(vp_bot)
- soil heat flow, site 3(g3)
- h(h)
- Soil heat capacity 5(cs5)
- wind direction (relative to true north)(wind_d)
- 0-5 cm integrated soil temperature, site 2(ts2)
- 0-5 cm integrated soil temperature, site 2(ts1)
- 0-5 cm change in soil heat storage with time, site 2(ces1)
- bottom air temperature(tair_bot)
- 0-5 cm change in soil heat storage with time, site 2(ces2)
- soil heat flow, site 1(g1)
- 0-5 cm integrated soil temperature, site 3(ts3)
- top air temperature(tair_top)
- 0-5 cm integrated soil temperature, site 4(ts4)
- top vapor pressure(vp_top)
- soil heat flow, site 4(g4)
- 0-5 cm integrated soil temperature, site 5(ts5)
- average surface soil heat flow(ave_shf)
- 0-5 cm change in soil heat storage with time, site 3(ces3)
- soil heat flow, site 2(g2)
- Soil heat capacity 4(cs4)
- 5 cm soil heat flow corrected for soil moisture content, site 5(c_shf5)
- vector wind speed(res_ws)
- Reference Thermistor Temperature(tref)
- 5 cm soil heat flow corrected for soil moisture content, site 1(c_shf1)
- Soil heat capacity 3(cs3)
- volumetric soil moisture, site 4(sm4)
- Temperature of the top humidity chamber(thum_top)
- Soil heat capacity 2(cs2)
- lat(lat)
- base time(base_time)
- 5 cm soil heat flow corrected for soil moisture content, site 4(c_shf4)
- Temperature of bottom humidity sensor chamber(thum_bot)
- 5 cm soil heat flow, site 4(shf4)
- lon(lon)
- latent heat flux(e)
- Soil heat capacity 1(cs1)
- scalar wind speed(wind_s)
- 5 cm soil heat flow, site 3(shf3)
- 5 cm soil heat flow corrected for soil moisture content, site 3(c_shf3)
sgp5ebbrE20.a0: - vector wind speed(res_ws)
- Dummy altitude for Zeb(alt)
- base time(base_time)
- Retrieved pressure profile(pres)
- lat(lat)
- bottom vapor pressure(vp_bot)
- Top humidity(hum_top)
- lon(lon)
- top vapor pressure(vp_top)
- Temperature of the top humidity chamber(thum_top)
- Bottom humidity(hum_bot)
- Time offset of tweaks from base_time(time_offset)
- Temperature of bottom humidity sensor chamber(thum_bot)
- bottom air temperature(tair_bot)
- wind direction (relative to true north)(wind_d)
- net radiation(q)
- Reference Thermistor Temperature(tref)
- top air temperature(tair_top)
- standard deviation of wind direction (sigma theta)(sigma_wd)
- Home signal(home)
- scalar wind speed(wind_s)
sgp15ebbrE20.a1: - Soil moisture 4(r_sm4)
- Right air temperature(tair_r)
- Soil temperature 5(rr_ts5)
- Left air temperature(tair_l)
- Soil moisture 3(r_sm3)
- Right relative humidity(mv_hum_r)
- Home signal(mv_home)
- Signature(signature)
- base time(base_time)
- Soil heat flow 2(mv_hft2)
- scalar wind speed(wind_s)
- Left relative humidity(mv_hum_l)
- Soil heat flow 1(mv_hft1)
- Soil heat flow 5(mv_hft5)
- Soil moisture 1(r_sm1)
- Reference temperature(rr_tref)
- Dummy altitude for Zeb(alt)
- Soil heat flow 3(mv_hft3)
- Soil heat flow 4(mv_hft4)
- Soil moisture 5(r_sm5)
- Soil moisture 2(r_sm2)
- Temperature of right humidity sensor chamber(rr_thum_r)
- Net radiation(mv_q)
- Soil temperature 1(rr_ts1)
- lat(lat)
- Atmospheric pressure(mv_pres)
- Battery(bat)
- Soil temperature 4(rr_ts4)
- Soil temperature 3(rr_ts3)
- Soil temperature 2(rr_ts2)
- lon(lon)
- Wind direction (relative to true north)(mv_wind_d)
- Time offset of tweaks from base_time(time_offset)
- Temperature of left humidity sensor chamber(rr_thum_l)
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