DQR ID | Subject | Data Streams Affected |
---|---|---|
D950626.8 | SBP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
D970623.2 | SGP/EBBR/E9 - Temperature Portion of T/RH Probe | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/10/1995 | 2100 | 03/10/1995 | 2130 |
03/11/1995 | 0100 | 03/11/1995 | 0600 |
03/11/1995 | 1530 | 03/12/1995 | 1930 |
03/13/1995 | 0430 | 03/13/1995 | 0500 |
03/16/1995 | 1830 | 03/18/1995 | 1100 |
03/19/1995 | 2100 | 03/20/1995 | 0400 |
03/20/1995 | 1530 | 03/20/1995 | 1700 |
Subject: | SBP/EBBR/E9 - Reprocess: Soil Heat Flow Sensor 5 Incorrect Data |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | Soil heat flow sensor #5 periodically outputted incorrect values during the period above. The output often indicated large negative heat flow. The sensor connections were tightened on March 20, 1995, which seems to have corrected the problem. The data affected (and thus incorrect) includes: 15 minute: mv_hft5 30 minute: shf5, c_shf5, g5, ave_shf, e, h. The dates and times (GMT) of incorrect values are listed below. Only half hour times are listed. 03/10/95 2130 03/11/95 0100-0600, 1530-2330 03/12/95 0000-1930 03/13/95 0500 03/16/95 1830-2330 03/17/95 0000-2330 03/18/95 0000-1100 03/19/95 2100-2330 03/20/95 0000-0400, 1530-1700 The latent and sensible heat fluxes can be recalculated by using only soil heat flows 1 through 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: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/15/1996 | 1715 | 06/18/1997 | 1645 |
Subject: | SGP/EBBR/E9 - Temperature Portion of T/RH Probe |
DataStreams: | sgp15ebbrE9.a1, sgp30ebbrE9.a1 |
Description: | The Temperature portion of the right T/RH probe indicated too high a temperature for nearly 11 months. I twice placed work requests to have the probe replaced, but no spares were available. Spares recently became available and I placed a new work request to have the probe changed. The replacement occurred on 18 June 1997; this fixed the problem. The main results of the high temperatures were probe top and bottom temperatures (used only for the calculation of vapor pressure) and vapor pressures that were too large. Furthermore, this caused latent heat flux to be reported to be too large, and therefore sensible heat flux was reported to be too small. Recalculation of the fluxes using thermocouple temperatures to calculate vapor pressure would be quite time consuming and would have to assume that the thermocouple temperature and probe temperature were nearly the same. The EBBR procedures have been changed to include comparison of the thermocouple and probe temperatures to make it easier for the site operators to detect this condition. The data affected (and thus incorrect) includes: 15 minute: rr_thum_r 30 minute: thum_top, thum_bot, vp_top, vp_bot, e, h, bowen. |
Measurements: | sgp15ebbrE9.a1:
sgp30ebbrE9.a1:
|