| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000210.3 | SGP/EBBR - EBBR E22 Moved, Data Missing/Incorrect | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D000210.4 | SGP/EBBR - EBBR E22 Net Radiation Incorrect | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D000301.11 | SGP/EBBR - EBBR E22 Soil Moistures Negative | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| D000302.2 | SGP/EBBR - EBBR E22 Soil Moistures Negative | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| D940105.10 | SGP/EBBR/E22 - Air Temperature Sensor malfunction | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D941021.3 | ||
| D941221.1 | SGP/EBBR/E26 - T/RH Check | sgp15ebbrE26.a1, sgp30ebbrE26.a1, sgp5ebbrE26.a0 |
| D951020.1 | SGP/EBBR/E9 - 3-month Check | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
| D951113.2 | ||
| D960104.3 | SGP/EBBR/E22 - Wind Speed Cups Frozen | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D960408.2 | SGP/EBBR/E22 - Reprocess: Soil Heat Flow Sensor 4 Incorrect Data | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| D960508.9 | SGP/EBBR/E22 - 3-month check | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D961122.19 | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
| D961122.2 | SGP/EBBR/E22 - Annual Calibration Changeout | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D970707.1 | SGP/EBBR/E22 - Reprocess: E22 Soil Heat Flow Sensor # 5 Incorrect Data | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| D970730.1 | SGP/EBBR/E22 - Right Aspirator Unit Stolen | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D971017.7 | SGP/EBBR/E22 - Reprocess: E22 EBBR Soil Heat Flow Probe #5 Incorrect Data | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| D971021.1 | SGP/EBBR/E7 - EBBR Biannual Checks | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
| D980413.5 | SGP/EBBR/E22 - Low Battery - Resulting In Incorrect Data | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D980416.17 | SGP/EBBR/E22 - 3-Month Check | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D980529.15 | SGP/EBBR/E22 - Six Month Checks | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| D980701.1 | ||
| D990127.2 | SGP/EBBR/E22 - Battery Voltage Low, Data Incorrect | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.00, sgp5ebbrE22.a0 |
| D990127.30 | SGP/EBBR/E22 - Wind Direction Data Incorrect | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.00, sgp5ebbrE22.a0 |
| D990316.1 | SGP/EBBR/E22 - Right Aspirator Fan Replaced | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/29/1999 | 1415 | 11/02/1999 | 2030 |
| Subject: | SGP/EBBR - EBBR E22 Moved, Data Missing/Incorrect |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | During, and as a consequence of, the relocation of E22 EBBR, some data is missing or incorrect during the period above. The data was sneakernetted on 3 Nov 99, so some of the data may have been recovered. Some of the data during the period is incorrect as a consequence of damage done by cattle during the period; inspection of the data is required to determine incorrect data. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/29/1999 | 1430 | 11/03/1999 | 1930 |
| Subject: | SGP/EBBR - EBBR E22 Net Radiation Incorrect |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | The upper dome of the net radiometer was broken, probably by migrating birds, and water had drained into the bottom dome. Since much of the data is missing during the period, it is not clear exactly when the top dome was broken during the period. All net radiation data and sensible and latent heat fluxes data are incorrect for this period. The affected data fields are: 5 minute: q 15 minute: mv_q 30 minute: q, e, h |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/20/1999 | 0300 | 08/04/1999 | 1730 |
| Subject: | SGP/EBBR - EBBR E22 Soil Moistures Negative |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Description: | Because of the lack of rain, soil moistures were negative during much
of the period. All five soil moisture sensors had negative outputs by
early on Aug 1. The negative soil moistures affected sensible and latent
heat fluxes slightly.
The affected data are:
15 minute: r_sm1, r_sm2, r_sm3, r_sm4, r_sm5
30 minute: sm1, sm2, sm3, sm4, sm5, c_shf1, c_shf2, c_shf3, c_shf4,
c_shf5, cs1, cs2, cs3, cs4, cs5, ces1, ces2, ces3, ces4, ces5,
g1, g2, g3, g4, g5, ave_shf, e, h |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/15/1999 | 0800 | 10/30/1999 | 0300 |
| Subject: | SGP/EBBR - EBBR E22 Soil Moistures Negative |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Description: | Because of the lack of rain, all soil moistures were negative during much
of the period. The negative soil moistures caused soil heat storage and
thus average soil heat flux to be smaller than they should have been. The
sensible and latent heat fluxes were therefore reduced slightly
(approximately 0-5%).
The affected data are:
15 minute: r_sm1, r_sm2, r_sm3, r_sm4, r_sm5
30 minute: sm1, sm2, sm3, sm4, sm5, c_shf1, c_shf2, c_shf3, c_shf4,
c_shf5, cs1, cs2, cs3, cs4, cs5, ces1, ces2, ces3, ces4, ces5,
g1, g2, g3, g4, g5, ave_shf, e, h |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/01/1993 | 0000 | 12/21/1993 | 1800 |
| Subject: | SGP/EBBR/E22 - Air Temperature Sensor malfunction |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | The right air temperature probe (thermocouple) malfunctioned during the periods stated above at Cordell, OK (E22). It was replaced on December 21, 1993 and good data began again with the 1830 GMT half hour average. For the periods of interest, 5 and 30 minute values of tair_top and tair_bot are incorrect when the right probe was in the specified position; 15 minute values of tair_r are incorrect; and 30 minute values of bowen, e, and h are incorrect. None of these values are recoverable or recalculatable through the use of other quantities since both air temperature probes are needed to determine bowen ratio. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|
| Subject: | |
| DataStreams: | |
| Description: | |
| Measurements: |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/09/1994 | 1615 | 11/09/1994 | 1800 |
| 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:
sgp5ebbrE26.a0:
sgp30ebbrE26.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/05/1995 | 1530 | 10/05/1995 | 1830 |
| Subject: | SGP/EBBR/E9 - 3-month Check |
| DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1, sgp5ebbrE9.a0 |
| Description: | 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. |
| Measurements: | sgp5ebbrE9.a0:
sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|
| Subject: | |
| DataStreams: | |
| Description: | |
| Measurements: |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/18/1995 | 1705 | 12/19/1995 | 1450 |
| Subject: | SGP/EBBR/E22 - Wind Speed Cups Frozen |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | 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 E22, Cordell, 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 |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/31/1996 | 1430 | 01/31/1996 | 1500 |
| 02/10/1996 | 0230 | 02/10/1996 | 1300 |
| 02/10/1996 | 1400 | 02/10/1996 | 1600 |
| 02/11/1996 | 0100 | 02/11/1996 | 0900 |
| 02/11/1996 | 1030 | 02/11/1996 | 1400 |
| 02/11/1996 | 1730 | 02/12/1996 | 0100 |
| 02/12/1996 | 1200 | 02/12/1996 | 1230 |
| 02/12/1996 | 1600 | 02/12/1996 | 1830 |
| 02/13/1996 | 0130 | 02/13/1996 | 0230 |
| 02/13/1996 | 1400 | 02/13/1996 | 1430 |
| 02/13/1996 | 1600 | 02/13/1996 | 1700 |
| 02/14/1996 | 0130 | 02/14/1996 | 0230 |
| 02/23/1996 | 0330 | 02/23/1996 | 0530 |
| 02/23/1996 | 1200 | 02/24/1996 | 0200 |
| 02/28/1996 | 2330 | 02/29/1996 | 0000 |
| 03/03/1996 | 0130 | 03/03/1996 | 0200 |
| 03/03/1996 | 1500 | 03/03/1996 | 1830 |
| 03/04/1996 | 0100 | 03/04/1996 | 0230 |
| 03/04/1996 | 0400 | 03/04/1996 | 1530 |
| 03/05/1996 | 1200 | 03/05/1996 | 1430 |
| 03/05/1996 | 1630 | 03/05/1996 | 1830 |
| 03/06/1996 | 0200 | 03/07/1996 | 0430 |
| 03/07/1996 | 2030 | 03/07/1996 | 2130 |
| 03/07/1996 | 2300 | 03/07/1996 | 2330 |
| 03/08/1996 | 0330 | 03/08/1996 | 1730 |
| 03/10/1996 | 0400 | 03/10/1996 | 1130 |
| 03/12/1996 | 0400 | 03/12/1996 | 1130 |
| 03/12/1996 | 1430 | 03/12/1996 | 1600 |
| 03/13/1996 | 0830 | 03/13/1996 | 1130 |
| 03/15/1996 | 0400 | 03/15/1996 | 2200 |
| 03/16/1996 | 0400 | 03/16/1996 | 0830 |
| 03/16/1996 | 1030 | 03/16/1996 | 1200 |
| 03/16/1996 | 1500 | 03/16/1996 | 1700 |
| 03/17/1996 | 0600 | 03/17/1996 | 0630 |
| 03/17/1996 | 0730 | 03/17/1996 | 2030 |
| 03/18/1996 | 0300 | 03/18/1996 | 1730 |
| 03/19/1996 | 0130 | 03/20/1996 | 1430 |
| 03/20/1996 | 1700 | 03/20/1996 | 1830 |
| 03/21/1996 | 0200 | 03/21/1996 | 0230 |
| 03/22/1996 | 0330 | 03/22/1996 | 0400 |
| 03/22/1996 | 1600 | 03/22/1996 | 1700 |
| 03/23/1996 | 0400 | 03/23/1996 | 1930 |
| 03/24/1996 | 2200 | 03/25/1996 | 1500 |
| 03/27/1996 | 1800 | 03/27/1996 | 2000 |
| Subject: | SGP/EBBR/E22 - Reprocess: Soil Heat Flow Sensor 4 Incorrect Data |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Description: | Soil heat flow sensor #4 periodically output incorrect values during the period indicated. The output often indicated large negative heat flow. The sensor was replaced on March 19, 1996, which corrected the problem. The data affected (and thus incorrect) includes: 15 minute: mv_hft4 30 minute: shf4, c_shf4, g4, ave_shf, e, h. The dates and times (GMT) of incorrect values are listed below. Only half hour data times are listed. 01/31/96 1500 (shf4 only) 02/10/96 0230-1300, 1400-1600 02/11/96 0100-0900, 1030-1400, 1730-2330 02/12/96 0000-0100, 1200-1230, 1600-1830 02/13/96 0130-0230, 1430, 1600-1700 02/14/96 0130-0230 02/23/96 0330-0530, 1200-2330 02/24/96 0000-0200 02/29/96 0000 03/03/96 0130-0200, 1500-1830 03/04/96 0100-0230, 0400-1530 03/05/96 1200-1430, 1630-1830 03/06/96 0200-2330 03/07/96 0000-0430, 2030-2130, 2330 03/08/96 0330-1730 03/10/96 0400-1130 03/12/96 0400-1130, 1430-1600 03/13/96 0830-1130 03/15/96 0400-2200 03/16/96 0400-0830, 1030-1200, 1500-1700 03/17/96 0630, 0730-2030 03/18/96 0300-1730 03/19/96 0130-2330 03/20/96 0000-1430, 1700-1830 03/21/96 0230 03/22/96 0400, 1600-1700 03/23/96 0400-1930 03/24/96 2200-2330 03/25/96 0000-1500 03/27/96 1800-2000 The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1, 2, 3, and 5 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g5)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/24/1996 | 1315 | 04/24/1996 | 1402 |
| Subject: | SGP/EBBR/E22 - 3-month check |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | 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 in the times indicated; data times affected do not include the beginning time and do include the ending time (data files are denoted by the end time). |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/31/1996 | 1804 | 10/31/1996 | 1840 |
| Subject: | SGP/EBBR/E4 - EBBR 3 Month Checks - 10 EFs |
| DataStreams: | sgp15ebbrE4.a1, sgp30ebbrE4.a1, sgp5ebbrE4.a0 |
| Description: | 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. |
| Measurements: | sgp5ebbrE4.a0:
sgp15ebbrE4.a1:
sgp30ebbrE4.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/06/1996 | 1300 | 11/06/1996 | 2300 |
| Subject: | SGP/EBBR/E22 - Annual Calibration Changeout |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | On 6 November 1996 the EBBR changeout for annual calibration occurred at E22, Cordell, OK. SEBS unit 7 was removed and unit 3 was installed. Between 1300 and 2300 GMT no data or incorrect data was collected; most of the data is missing. Data for half hour 1930 GMT on 7 November is incorrect; 3 month calibration checks were being performed. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/14/1997 | 0000 | 04/09/1997 | 1730 |
| Subject: | SGP/EBBR/E22 - Reprocess: E22 Soil Heat Flow Sensor # 5 Incorrect Data |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Description: | Soil heat flow sensor #5 frequently produced large negative (and incorrect) values during the period above. The problem ended during a PM visit by site operations. However, there is no documentation by Site Operations in the instrumentation report or corrective maintenance report that Site Operations personnel took action to correct the problem. Site Operations also told me that they have no record of any changes or corrective maintenance. Apparently, something fortuitous happened during the PM to correct the problem. The start date and time of the problem cannot be determined exactly, but it did begin during a period of missing data from Feb. 14-25, 1997. Values affected (and thus incorrect) include: 15 minute: mv_hft5 30 minute: shf5, c_shf5, g5, ave_shf, e, h. The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1, 2, 3, and 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 06/13/1997 | 0305 | 07/16/1997 | 1500 |
| Subject: | SGP/EBBR/E22 - Right Aspirator Unit Stolen |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | On 13 June 1997, vandals stole the right AEM aspirator unit, including the thermocouple and T/RH probe inside. These were replaced on 16 July 1997. Incorrect data fields during the period above are: 5 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot 15 minute: rr_thum_r, mv_hum_r, tair_r 30 minute: tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot, vp_top, vp_bot, bowen, e, h |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/30/1997 | 1700 | 07/30/1997 | 1830 |
| Subject: | SGP/EBBR/E22 - Reprocess: E22 EBBR Soil Heat Flow Probe #5 Incorrect Data |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Description: | Soil heat flow probe #5 produced large negative (and incorrect) values during the period above. The probe was replaced. Somehow, two half hour records were produced at 1900 GMT as a result, the first record having 9s for the data fields; the second record is correct. Values affected (and thus incorrect) include: 15 minute: mv_hft5 30 minute: shf5, c_shf5, g5, ave_shf, e, h. The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1, 2, 3, and 4 to calculate the average soil heat flow, ave_shf = (g1 + g2 + g3 + g4)/4 e = -(q + ave_shf)/(1 + bowen) h = -(e + ave_shf + q) |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/16/1997 | 1533 | 04/16/1997 | 1625 |
| Subject: | SGP/EBBR/E7 - EBBR Biannual Checks |
| DataStreams: | sgp15ebbrE7.a1, sgp30ebbrE7.a1, sgp5ebbrE7.a0 |
| Description: | 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. |
| Measurements: | sgp15ebbrE7.a1:
sgp30ebbrE7.a1:
sgp5ebbrE7.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/15/1998 | 0300 | 01/15/1998 | 1415 |
| Subject: | SGP/EBBR/E22 - Low Battery - Resulting In Incorrect Data |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | A low battery condition (less than 10.5 volts) caused a number of data fields to be incorrect at some times and all data fields to be incorrect at a more limited number of times. All data fields are suspect when the battery voltage drops below 10.5 volts because the CR10 cannot operate properly. Some sensors are affected slightly (i.e. pressure) at slightly larger voltages. The low battery condition resulted from an initially weak battery and a week of extremely low solar radiation (from heavy cloudiness) on the solar panel that provides most of the charging of the battery. Comments added by Marv Wesely: David Cook has been working with Dave Breedlove to try to assess the age of the batteries. The dates on the batteries needs to be read during site visits and provided to David C. It's quite possible that they need to be replaced. It's work in progress, though slow at times. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/08/1997 | 1830 | 10/08/1997 | 1902 |
| Subject: | SGP/EBBR/E22 - 3-Month Check |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | 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. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/06/1998 | 1800 | 05/06/1998 | 1840 |
| Subject: | SGP/EBBR/E22 - Six Month Checks |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.a0 |
| Description: | 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. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|
| Subject: | |
| DataStreams: | |
| Description: | |
| Measurements: |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/03/1998 | 0615 | 11/10/1998 | 1430 |
| Subject: | SGP/EBBR/E22 - Battery Voltage Low, Data Incorrect |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.00, sgp5ebbrE22.a0 |
| Description: | Battery voltages less than 10.4 volts occurred much of the time. All data should be considered incorrect when the voltage is less than 10.4 volts. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.00:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/07/1999 | 2355 | 01/08/1999 | 1100 |
| Subject: | SGP/EBBR/E22 - Wind Direction Data Incorrect |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1, sgp5ebbrE22.00, sgp5ebbrE22.a0 |
| Description: | 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 |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
sgp5ebbrE22.00:
sgp5ebbrE22.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/10/1999 | 2045 | 03/10/1999 | 2100 |
| Subject: | SGP/EBBR/E22 - Right Aspirator Fan Replaced |
| DataStreams: | sgp15ebbrE22.a1, sgp30ebbrE22.a1 |
| Description: | Replacement of the right aspirator fan on the EBBR AEM caused temperature, relative humidity, and vapor pressure data to be incorrect for the 2045 and 2100 GMT 15 minute data and Bowen ratio, sensible heat flux, and latent heat flux to be incorrect for the 2100 GMT data. |
| Measurements: | sgp30ebbrE22.a1:
sgp15ebbrE22.a1:
|