| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D000531.2 | SGP/EBBR/E13 - Data Missing Due to Power Failure | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D000531.3 | SGP/EBBR/E13 - Data missing or corrupted | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D000531.4 | SGP/EBBR/E13 - failure of sensors | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D000531.5 | SGP/EBBR/E13 - Failed Right Humidity Probe | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D000628.1 | SGP/EBBR/E13- Left humidity probe replaced | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D020628.16 | SGP/EBBR/E13 - T/RH Check | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D020628.2 | SGP/EBBR/E13 - 3-month Check | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D020723.1 | SGP/EBBR/E13 - Thermocouple out of range, data incorrect | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D930428.2 | SGP/EBBR/E13 - incorrect home signal | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| D930503.2 | SGP/EBBR/E13 - incorrect meteorological observations | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| D931108.3 | SGP/EBBR/E13 - pressure calibration | sgp30ebbrE13.a1 |
| D931108.4 | SGP/EBBR/E13 - solid moisture correction | sgp30ebbrE13.a1 |
| D940106.5 | SGP/EBBR/E13 - Invalid data during disconnection of AEM at E13 | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D940511.2 | SGP/EBBR/E13 - SM4 Replacement | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D941021.5 | SGP/EBBR/E13 - Soil Temperature Aberations | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D941208.1 | SGP/EBBR/E13 - Net Radiation - Hemisphere Replacement | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D950126.1 | SGP/EBBR/E13 - Incorrect Soil Temperature #4 | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D950626.1 | SGP/EBBR/E13 - Frozen Wind Speed Sensor | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D950626.2 | SGP/EBBR/E13 - Frozen Wind Speed Sensor | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D950626.7 | SGP/EBBR/E13 - Reprocess: Soil Temperature Malfunction | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D950815.2 | SGP/EBBR/E13 - Low Battery Voltage and AEM Left on Manual | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| D950828.1 | SGP/EBBR/E13 - Battery Voltage Drop | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D951113.1 | SGP/EBBR/E13 - Wind Direction Set Pin Slippage | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D951113.6 | SGP/EBBR/E13 - Battery voltage drop | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D951116.1 | SGP/EBBR/E13 - AEM Exchange Stopped in Snow and Freezing Rain | sgp30ebbrE13.a1 |
| D951220.2 | SGP/EBBR/E13 - Missing data | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| D951220.6 | SGP/EBBR/E13 - battery voltage drop | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D960104.1 | SGP/EBBR/E13 - EBBR down - Data Missing | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| D960508.6 | SGP/EBBR/E13 - 3-month check | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D960606.1 | SGP/EBBR/E13 - Annual Calibration changeout | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| D961122.11 | SGP/EBBR/E13 - Wind Direction Incorrect | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D961122.24 | SGP/EBBR/E13 - EBBR 3 Month Checks - 10 EFs | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D970330.1 | SGP/EBBR/E13 - Frozen Wind Speed Sensor | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D970730.3 | SGP/EBBR/E13 - CR10 Malfunction | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D971017.5 | SGP/EBBR/E13 - Missing Data | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D971021.5 | SGP/EBBR/E13 - EBBR Biannual Checks | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D980117.19 | SGP/EBBR/E13- EBBR Frozen Wind Speed | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D980117.27 | SGP/EBBR/E13 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| D980416.12 | SGP/EBBR/E13 - 3-Month Check | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/1995 | 0800 | 07/17/1995 | 2200 |
| Subject: | SGP/EBBR/E13 - Data Missing Due to Power Failure |
| DataStreams: | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | A power failure following a lightning strike to the central cluster area resulted in the EBBR data being missing for this period of time. |
| Measurements: | sgp5ebbrE13.a0:
sgp5ebbrE13.00:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/24/1995 | 1300 | 07/24/1995 | 2300 |
| Subject: | SGP/EBBR/E13 - Data missing or corrupted |
| DataStreams: | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | Data are missing or corrupted during this period due to a broken wire on the solar panel that lowered the voltage to the system and maintenance that took place from 1530 to about 2215 GMT. |
| Measurements: | sgp5ebbrE13.a0:
sgp5ebbrE13.00:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/1995 | 2200 | 07/24/1995 | 2300 |
| Subject: | SGP/EBBR/E13 - failure of sensors |
| DataStreams: | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | A lightning strike to the central cluster area shortly after 0800 GMT on July 17 caused failure of several EBBR sensors: both humidity probes, the barometer, soil heat flux #3, soil moisture # 1 and the wind direction. These failed sensors caused sensible, latent, and average soil heat flux to be incorrect until site operations performed maintenance on July 24th. Site Operations found a loose connection from soil moisture probe #1, removed barometer SN 6578 and replaced it with SN 6507, removed soil heat flux sensor #3 with SN 923022 and replaced it with SN 933199, repositioned the wind direction sensor - which was rotated approximately ninety degrees clockwise from its proper position, and removed the right humidity probe SN 460412 and replaced it with SN 460428. |
| Measurements: | sgp5ebbrE13.a0:
sgp5ebbrE13.00:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/1995 | 2200 | 09/22/1995 | 2108 |
| Subject: | SGP/EBBR/E13 - Failed Right Humidity Probe |
| DataStreams: | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | A lightning strike to the central cluster area on 17 July 1995 caused failure of several EBBR sensors including the right humidity probe. On July 24th, site operations removed the right humidity probe SN 460412 and replaced it with SN 460428 In less than a day the right humidity probe output soared to over 113% and has hovered around 112% since. I consider all right probe values to be incorrect due to this behavior. Without a properly functioning right humidity probe, all values of top and bottom relative humidity, top and bottom vapor pressure, Bowen ratio, and latent and sensible heat fluxes are incorrect. A working spare relative humidity probe was not available at that time. The probe was replaced with a working, calibrated probe on 22 September 1995 at about 2108 GMT. I have the examined the data since the day of the replacement and find that the new probe is working well. All E13 EBBR measurements are presently correct. The old probe S/N was 460428, the new S/N is 460413. |
| Measurements: | sgp5ebbrE13.a0:
sgp5ebbrE13.00:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/1995 | 2200 | 07/25/1995 | 1930 |
| Subject: | SGP/EBBR/E13- Left humidity probe replaced |
| DataStreams: | sgp5ebbrE13.00, sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | A lightning strike to the central cluster area on 17 July 1995 caused the left humidity probe to fail. Some of the period of incorrect data has been discussed in D0000531.4. The left humidity probe was replaced on 25 July 1995 at 1925 GMT (old SN 460413, new SN 460435). |
| Measurements: | sgp5ebbrE13.a0:
sgp5ebbrE13.00:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/04/1994 | 2005 | 11/04/1994 | 2100 |
| Subject: | SGP/EBBR/E13 - T/RH Check |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| 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: 2005, 2010, 2015, 2020, 2025, 2030, 2035, 2040, 2045,
2050, 2055, 2100, 2105
15 minute: 2015, 2045, 2100, 2115
30 minute: 2030, 2100
(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: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/06/1995 | 0000 | 10/06/1995 | 2359 |
| Subject: | SGP/EBBR/E13 - 3-month Check |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| 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. Time of the check is not known, so the entire day has been flagged as suspect. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/22/1995 | 2030 | 12/22/1995 | 2130 |
| Subject: | SGP/EBBR/E13 - Thermocouple out of range, data incorrect |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | The left thermocouple temperature for 22 December was out of range between 2030 and 2130 GMT, yielding incorrect values as listed below: 5 minute: tair_top, tair_bot 15 minute: tair_l 30 minute: tair_top, tair_bot, bowen, h, e |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1993 | 1201 | 07/13/1993 | 1202 |
| Subject: | SGP/EBBR/E13 - incorrect home signal |
| DataStreams: | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| Description: | EDITOR'S NOTE: This DQR refers to data collected by the EBBR at E13 prior
to the begin date of regular ARM data. At that time, the data streams which
contain the EBBR.E13 data were named
Dsgp15ebbr1.a0
Dsgp30ebbr1.a1
Dsgp5ebbr1.a0
These data are not readily available from the ARM archive, but can be
made available by special request. The actual time range of the problem
described here is 921230.0000-930423.1200.
EBBR1, Central Facility reported incorrect home value signals from 30
December 1992 through 23 April 1993. The home signals are used in the
calculation of fluxes by the CR10 data logger. The fluxes for this period
are thus invalid as reported and must be recalculated from the archived 15
minute data. The proper home signals are less than 35 for 30 minute home
signal and greater than 35 for 15 minute home signal. Home signals were
the same value for 15 minute and 30 minute during the period of interest,
although they were not a constant value. The chronology of the situation
is reported below. On 7 April 1993 I noticed the problem in the A0 data.
On 30 December 1992, the automatic exchange mechanism (AEM) of the Central
Facility EBBR froze up with ice and stopped working (surmised from looking
at the EBBR1 data). This caused a fuse to blow and stop the mechanism from
operating. However, one channel of the CR10 data logger was apparently damaged
in the process. The condition of the AEM only, was noticed on 4 January 1993
by site operations personnel. The blown fuse was replaced, which started
the AEM working; but AEM home signal values between 30 Dec and 04 Jan were
around zero. Home values remained around zero until at least January 8, 1993.
I have a gap in data archived at ANL between 8 and 15 January 1993, during
which I do not know quite what was happening. On 11 January 1993 site
operations personnel found that the EBBR1 battery was run down and the EBBR
thus was not working. A new battery was installed. On 15 January the home
values were about 34. I am assuming that they became 34 upon installation
of the new battery on 11 January. Until at least 15 January the home signals
stayed around 34. After that period the home signals became greater than
35 and generally were around 36. Only occasionally (a few hours here and
there)were the home signals just above or below 35 to produce the proper
flux outputs. On 23 April 1993, at my direction (and after a week of tests
on other parts of the system), the CR10 data logger was replaced. This solved
the problem. In fact, previous to this I had suggested reloading the software
into the previous CR10, but the CR10 would not accept it; as soon as the
machine was deactivated before that procedure it stopped working altogether.
I find it amazing that it worked at all, although all data other than the home
signals, and the calculated quantities dependent on them looked perfectly
acceptable during the period of interest; there is no evidence that the
CR10 was malfunctioning in other areas.
The road to restoring the 30 Dec to 23 April data would be a rocky one, as
each 15 minute data period would have to be examined to determine the
proper position of the sensors on the AEM. However, it is possible to
reconstruct most of the 30 minute calculated values from the 15 minute data. |
| Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1993 | 1201 | 07/13/1993 | 1202 |
| Subject: | SGP/EBBR/E13 - incorrect meteorological observations |
| DataStreams: | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| Description: | EDITOR'S NOTE: This DQR refers ti data collected by the EBBR at E13 prior
to the begin date of regular ARM data. At that time, the data streams which
contain the EBBR.E13 data were named
Dsgp15ebbr1.a0
Dsgp30ebbr1.a1
Dsgp5ebbr1.a0
These data are not readily available from the ARM archive, but can be
made available by special request. The actual time range of the problem
described here is 930417.1200-930422.1730.
Beginning at 1200 UTC on 17 April 1993, EBBR1, Central Facility, outputs
ramped to extreme values, some positive, some negative. These outputs ended
their ramping approximately 3 hours later. Comparison with SMOS data
indicate that no time averaged outputs from EBBR1 were consistent with the
SMOS after 1200 UTC.
It appears that the averaging instruction in the CR10 data logger had been
corrupted. On 22 April site operations, at my request, tried to reenter
the software; this attempt was completely unsuccessful, indicating that the
CR10 probably had other problems as well. EBBR1 was offline from 1730 UTC
on 22 April until 1400 UTC on 23 April, when a new CR10 was installed and the
software downloaded successfully.
Since a SDS utility for extracting real time data from the CF SMOS had not been
established, EBBR1 was being used for weather observations. All EBBR1
measurements of meteorological quantities during the period above are
invalid. |
| Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1993 | 1200 | 11/02/1993 | 2121 |
| Subject: | SGP/EBBR/E13 - pressure calibration |
| DataStreams: | sgp30ebbrE13.a1 |
| Description: | In the original Campbell CR10 software provided by the vendor (version 1),
the EBBR had incorrect calibration pressure sensor slopes and offsets.
The slopes and offset was carried through into version 2 of the
software and was not discovered by the mentor (me) until sometime later.
The calibration and slope did not deleteriously affect calculations in
the program since only a four percent reduction in atmospheric pressure
measurement resulted (the calculations are not very sensitive to small
errors in pressure). The vendor does not recall how the wrong
calibrations came to be used.
Version 4 of the CR10 program includes the proper calibration and offset.
This remedies the apparent offset problem (it was actually a calibration
and offset problem). In comparisons with the co-located SMOS pressure
sensor, the difference between the SMOS and EBBR pressure values appeared
almost constant with time, hence the assumption of an offset problem.
However, the EBBR pressure sensor offsets are so large (a consequence of
tailoring the calibration curve to a small range of elevations in which the
calibration applies) that the very small error in slope was difficult to
recognize.
The outputted pressure values for the EBBR system can be corrected
with the following information and equations.
Old Slope Old Offset New Slope New Offset
0.01952 81.24 0.02031 81.27
Correct Pressure =
((Current Pressure Data - 81.24)*0.02031/0.01952) + 81.27
= 1.04047*(Current Pressure Data) - 3.258 |
| Measurements: | sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/13/1993 | 1200 | 11/02/1993 | 2121 |
| Subject: | SGP/EBBR/E13 - solid moisture correction |
| DataStreams: | sgp30ebbrE13.a1 |
| Description: | In the original EBBR software (Version 1) for the Campbell CR10 at the Central Facility (E13), adjustment of the soil moisture for soil type was performed differently than for the other EBBR systems. This was supposed to have been changed prior to installation (according to the vendor), but the change was not made. This adjustment was carried into Version 2 and was not discovered by the mentor (me) until later. A polynomial is used to adjust the measured soil moisture for differences between the soil type at the location of installation (clay-loam assumed) and the soil type (sand) used in the calibration of the soil moisture sensor. The adjustment in the E13 EBBR only, was computed on the basis of a sandy-loam soil. Presently, a clay-loam soil type is assumed for each EBBR location. Soil types at the extended facilities have not been characterized yet, although there are hopes of doing so in the future. The effect of using a polynomial for sandy-loam soil instead of clay-loam soil is to decrease the resultant soil moisture values by approximately 14.5% when the clay-loam polynomial would indicate a soil moisture of 28.3%, and by approximately 38.3% when the clay-loam polynomial would indicate a soil moisture of 6.3%. The normal range of soil moisture at the EBBR sites is approximately 3% to 35%. The effect of the soil moisture decreases above on the adjustment to soil heat flux plate measurements is less than 1.0%. The effect on the change in energy storage in the soil (determined from the change in soil temperature over time) is a 10% decrease for a soil moisture of 28.3% and a decrease of 13.0% for a soil moisture of 6.3%. The change in energy storage is typically 5% of the total surface energy budget during mid-day and 25% at night. Therefore, the soil type adjustment error in the Central Facility EBBR resulted in approximately a 0.5% error in the surface energy budget during mid-day and 2.5% at night. These are small and acceptable errors and should not cause one to need to recalculate energy budget values. |
| Measurements: | sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/31/1993 | 1950 | 12/31/1993 | 2100 |
| Subject: | SGP/EBBR/E13 - Invalid data during disconnection of AEM at E13 |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | On December 31, 1993 at 1950 GMT the AEM on the Central Facility EBBR was
disconnected. Another AEM was then connected, on which some testing was needed
before site operations could be confident that it was ready for field
installation at an extended facility. At 2041 GMT the original AEM was
reconnected. The following 5, 15, and 30 minute data between or for the stated
times below is invalid:
5 minute (1950 to 2045 GMT): tair_top, tair_bot, thum_top, thum_bot, hum_top,
hum_bot, vp_top, vp_bot, home
15 minute (2000 to 2045 GMT): rr_thum_r, rr_thum_l, mv_hum_r, mv_hum_l,
mv_home, tair_r, tair_l
30 minute (2000 through 2100 GMT): tair_top, tair_bot, thum_top, thum_bot,
hum_top, hum_bot, vp_top, vp_bot, bowen, e, h, home_15, home_30 |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/06/1994 | 1515 | 05/06/1994 | 1600 |
| Subject: | SGP/EBBR/E13 - SM4 Replacement |
| DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | Soil Moisture Probe #4 has been indicating large soil moistures in the past couple of months. At times the values have exceeded the upper limit of the acceptable range. This data could be considered questionable, although the affect on average soil moisture and quantities affected by it is very small. Therefore, I do not suggest additional flagging of the data other than that imposed by the limits. The probe was changed from S/N 92004 to 93004 on May 6, 1994 at 1530 GMT. During the exchange process a few selected periods of soil moisture #4 data is incorrect, but not so different from the other soil moisture probes as to have a significant affect on the average soil moisture or the fluxes. Additionally, the EBBR output was interrupted for a half hour while the calibration of the new probe was entered into the CR10 data logger. Therefore, all 5 minute data from 1535 to 1600 GMT, 15 minute data for 1545 and 1600 GMT, and 30 minute data for 1600 GMT is incorrect. Furthermore, disturbance of the area near the #4 soil probes (temperature, soil moisture, and heat flux) caused all three to be incorrect for the following periods: 30 minute 1530 GMT 15 minute 1515 and 1530 GMT 5 minute 1515, 1520, 1525, and 1530 GMT. Complete recovery by all three sensors did not occur for one day (which is fairly typical for near surface installations), although the differences from the other four sets of soil sensors did not deleteriously affect the averages of the soil quantities. |
| Measurements: | sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/13/1994 | 2300 | 10/14/1994 | 1900 |
| Subject: | SGP/EBBR/E13 - Soil Temperature Aberations |
| DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | For a period of not quite a day, soil temperature probe #4 indicated values
that were either too high or too low, for unknown reasons. After Site
Operations personnel checked connectors and the probe itself, it recovered
to proper values. The probe has functioned properly since then. The times
and incorrect data fields are listed below.
15 minute: rr_ts4, 10/13/94: 2245 GMT; 10/14/94: 0000, 0200, 0230, 0515,
0600, 0630, 1300-1500, 1530-1715, 1815, 1845 GMT
30 minute: ts4, 10/13/94: 2300 GMT; 10/14/94: 0000, 0230, 0530-0630,
1300-1700, 1830-1900 GMT
ces4, g4, ave_shf, e, h, 10/14/94: 0030, 0200-0230, 0600-0630,
1300-1900 GMT |
| Measurements: | sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/02/1994 | 1937 | 12/02/1994 | 2000 |
| Subject: | SGP/EBBR/E13 - Net Radiation - Hemisphere Replacement |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | The upper hemisphere of the net radiometer was punctured (pinhole) and thus was replaced at 1937 GMT on December 2, 1994. This resulted in a spike in the net radiation data. 5 minute q data for 1935, 1940, 1945, and 1955 GMT, 15 minute mv_q data for 1945 and 2000 GMT, and 30 minute q, e, and h data for 2000 GMT are incorrect. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/13/1994 | 0430 | 12/13/1994 | 0500 |
| 12/13/1994 | 1800 | 12/13/1994 | 1830 |
| 12/18/1994 | 0900 | 12/18/1994 | 1030 |
| 12/18/1994 | 1630 | 12/18/1994 | 1930 |
| 12/19/1994 | 0000 | 12/19/1994 | 1600 |
| 12/20/1994 | 0200 | 12/20/1994 | 0400 |
| 12/23/1994 | 0830 | 12/23/1994 | 2030 |
| 12/24/1994 | 0800 | 12/25/1994 | 0100 |
| 12/25/1994 | 0200 | 12/25/1994 | 1400 |
| 12/25/1994 | 1500 | 12/25/1994 | 1600 |
| 12/25/1994 | 1700 | 12/26/1994 | 1800 |
| 12/27/1994 | 0200 | 12/27/1994 | 1700 |
| 12/30/1994 | 1730 | 12/30/1994 | 1800 |
| Subject: | SGP/EBBR/E13 - Incorrect Soil Temperature #4 |
| DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | For periods of a number of days in December 1994, soil temperature probe #4 indicated incorrect values that were either too high or too low. Site Operations personnel replaced the sensor on December 30, 1994. The times and incorrect data fields are listed below. Only half hour times are listed. The incorrect data on December 30 was the result of the process of replacing the sensor during that time. Data Fields: 15 minute: rr_ts4 30 minute: ts4, ces4, g4, ave_shf, e, h Dates and Times (GMT): 12/13/94 0500, 1830 12/18/94 0900-1030, 1630-1930 12/19/94 0000-1600 12/20/94 0200-0400 12/23/94 0830-2030 12/24/94 0800-2330 12/25/94 0000-0100, 0200-1400, 1530, 1600, 1700-2330 12/26/94 0000-1800 12/27/94 0200-1700 12/30/94 1730-1800 Recomputation of the change in energy storage in the soil could be done roughly from the soil temperature sensors that were still working (roughly because the difference in soil temperature with time is determined with real-time (one minute samples) data, not from the 15 or 30 minute data). However, this would require considerable effort. The process for doing so is therefore not stated here. Contact the mentor for more information if neccesary. |
| Measurements: | sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/14/1995 | 1100 | 02/14/1995 | 1730 |
| Subject: | SGP/EBBR/E13 - Frozen Wind Speed Sensor |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | DQR No: Platform: EBBR
Subject: Frozen Wind Speed Sensor
Date Submitted: JUNE 22, 1995
Submitted By: _x_ Instrument Mentor
___ EST Member
___ Science Team Member
___ Other _____________________________
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.
Platform/Measurement: EBBR/ Wind Speed
What level data: (raw,a0,a1,b1,c1 etc): a1 (15 and 30 minute)
a0 (5 minute)
What location was the data collected at: E13, Central Facility
Period of time in question
Begin Date 2/14/95 Time 1100 GMT
End Time 1730 GMT
Data should be labeled:
___ questionable ___ All data fields affected
_X_ incorrect _X_ Only some data fields affected
___ wrong calibration
___ others
Discussion of Problem:
On February 14, 1995 a frontal system deposited freezing rain in central
Oklahoma that resulted in the EBBR wind speed instrument becoming frozen in
place at the Central Facillity (E13) for part of a day. All 5, 15, and 30
minute data values indicated below are incorrect for the period listed above.
5 minute: wind_s, res_ws
15 minute: wind_s
30 minute: wind_s, res_ws
Other observations/measurements impacted by this problem:
Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)
Flag data with this comment.
Data Processing Notes Date
-------------------------------------------------------------------
END |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/07/1995 | 0245 | 03/08/1995 | 1640 |
| Subject: | SGP/EBBR/E13 - Frozen Wind Speed Sensor |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | On March 7, 1995 freezing rain stopped the cups of the EBBR wind speed instrument at the Central Facility (E13). All 5, 15, and 30 minute data values indicated below are incorrect for the period listed above. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/17/1995 | 1400 | 02/22/1995 | 1500 |
| Subject: | SGP/EBBR/E13 - Reprocess: Soil Temperature Malfunction |
| DataStreams: | sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | For several days, soil temperature probe #4 indicated values that were either too high or too low, for unknown reasons. After Site Operations personnel checked connections, it recovered to proper values. Affected quantities are shown below. 15 minute: rr_ts4 30 minute: ts4, ces4, g4, ave_shf, e, h Sensible, latent, and soil heat fluxes need to be recalculated using the change in energy storage of probes 1-3 and 5, as follows. ave_shf = (g1 + g2 + g3 + g5)/4 e = -(q + ave_shf)/(1 +bowen) h = -(e + ave_shf +q) |
| Measurements: | sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/01/1995 | 1500 | 08/02/1995 | 1615 |
| Subject: | SGP/EBBR/E13 - Low Battery Voltage and AEM Left on Manual |
| DataStreams: | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| Description: | Low battery voltage caused some data values to be incorrect beginning at 1500 GMT on August 1, 1995. The data should be carefully inspected to determine which values are incorrect. During replacement of the battery at the Central Facility EBBR on August 1, 1995, the AEM exchange toggle switch was left in the manual position, which caused the right aspirator to remain in the home position until the switch was correctly placed in the exchange position at 1616 GMT on August 2, 1995. All 5, 15, and 30 minute values of temperature, relative humidity , vapor pressure, bowen, e, and h are incorrect during the period. 15 and 30 minute values are also incorrect at 1630 GMT. |
| Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/16/1995 | 0600 | 08/16/1995 | 1530 |
| 08/18/1995 | 1230 | 08/18/1995 | 1500 |
| 08/19/1995 | 1100 | 08/19/1995 | 1500 |
| 08/20/1995 | 0900 | 08/20/1995 | 1500 |
| 08/21/1995 | 0600 | 08/21/1995 | 1500 |
| Subject: | SGP/EBBR/E13 - Battery Voltage Drop |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | Sometime before August 16, 1995 the AC/DC converter was switched off and the instrument heaters were switched on. The solar panel was not able to keep the battery voltage up under these conditions. Much of the data for the periods indicated is incorrect, especially data from the sensors that require 12 volts DC power. The data would have to be inspected to determine what data is correct and what is incorrect. It would be safest to exclude all data from those periods from any analysis. Site operations switched the heaters off and turned the converter back on on August 21, 1995. As reported in a recent DQR, the fluxes from the EBBR are incorrect presently because of a malfunctioning T/RH probe; no spares are presently available. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/26/1995 | 0000 | 11/03/1995 | 2045 |
| Subject: | SGP/EBBR/E13 - Wind Direction Set Pin Slippage |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | The set pin bolt on the wind vane loosened, allowing the vane to turn on the shaft. Wind directions are incorrect as a result, for the period listed above. The bolt was tightened on 3 Nov 95 so that correct wind directions would result. Values that are incorrect for the period are: 5 minute: wind_d, res_ws, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, res_ws, sigma_wd |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/04/1995 | 1200 | 11/04/1995 | 1400 |
| 11/05/1995 | 0330 | 11/05/1995 | 1430 |
| 11/06/1995 | 0000 | 11/06/1995 | 1530 |
| 11/07/1995 | 0000 | 11/07/1995 | 1400 |
| 11/08/1995 | 0000 | 11/08/1995 | 1400 |
| Subject: | SGP/EBBR/E13 - Battery voltage drop |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | On Friday 2 November, 1995 the instrument heaters were switched on. By
4 November, the solar panel was not able to maintain the battery voltage for
the cold night conditions that existed. On Monday, 5 November the heaters
were turned off, but the poor condition of the battery did not allow it,
once partially drained, to recharge sufficiently for nighttime conditions.
On 8 November, at 2106 GMT, the battery was replaced (resulting in missing
data for 2030-2130 GMT). Most of the data for the period above is incorrect,
especially data from the sensors that require at least 11 volts DC power.
The data that is incorrect is listed below.
5 minute: tref, tair_top, tair_bot, thum_top, thum_bot, hum_top, hum_bot,
vp_top, vp_bot, q, pres, home
15 minute: rr_thum_r, rr_thum_l, rr_ts1, rr_ts2, rr_ts3, rr_ts4, rr_ts5,
rr_tref, mv_hum_r, mv_hum_l, mv_pres, mv_home, mv_q, mv_hft1,
mv_hft2, mv_hft3, mv_hft4, mv_hft5, tair_r, tair_l
30 minute: tair_top, tair_bot, tref, thum_top, thum_bot, hum_top, hum_bot,
vp_top, vp_bot, pres, home_15, home_30, bowen, e, h, shf, shf1,
shf2, shf3, shf4, shf5, c_shf1, c_shf2, c_shf3, c_shf4, c_shf5,
ts1, ts2, ts3, ts4, ts5, q, g1, g2, g3, g4, g5, ces1, ces2,
ces3, ces4, ces5
Periods of time affected (these are the 30 minute periods that are
incorrect - incorrect 5 and 15 minute data may also occur for all or part
of the previous half hour):
4 Nov 95: 1200-1400 GMT
5 Nov 95: 0330-1430 GMT
6 Nov 95: 0000-1530 GMT
7 Nov 95: 0000-1400 GMT
8 Nov 95: 0000-1400 GMT |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/11/1995 | 0700 | 11/11/1995 | 0730 |
| Subject: | SGP/EBBR/E13 - AEM Exchange Stopped in Snow and Freezing Rain |
| DataStreams: | sgp30ebbrE13.a1 |
| Description: | 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. |
| Measurements: | sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/05/1995 | 1815 | 12/07/1995 | 1900 |
| Subject: | SGP/EBBR/E13 - Missing data |
| DataStreams: | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| Description: | The EBBR 13 data during the period indicated is missing. This may be related to the replacement of fiber optic cable at the Central Facility; this activity was taking place at the time. It is unknown whether the data was sneakernetted for this missing period. A PIF has been submitted concerning the data loss, as provision was supposedly made to avoid any loss of data during the fiber replacement. |
| Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/09/1995 | 0530 | 12/09/1995 | 1415 |
| 12/13/1995 | 0400 | 12/13/1995 | 1800 |
| 12/13/1995 | 2300 | 12/14/1995 | 1430 |
| 12/15/1995 | 0745 | 12/15/1995 | 1515 |
| Subject: | SGP/EBBR/E13 - battery voltage drop |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | The E13 battery condition was such that the solar panel was not able to keep the battery voltage up (greater than 11 V DC) under cloudy conditions. The data for the periods above is incorrect; many sensors require at least 11 volts DC power. On 15 December 1995 at 1900 GMT the EBBR lost it's connection to the site data system; data after this period will be discussed in a separate DQR. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/15/1995 | 1900 | 12/21/1995 | 0405 |
| 12/21/1995 | 1630 | 12/22/1995 | 2045 |
| Subject: | SGP/EBBR/E13 - EBBR down - Data Missing |
| DataStreams: | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| Description: | Between 15 and 22 December 1995 the E13 EBBR experienced a number of communication and hardware problems. The data for the periods indicated are therefore missing. |
| Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/06/1996 | 1755 | 05/06/1996 | 1835 |
| Subject: | SGP/EBBR/E13 - 3-month check |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| 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 above; data times affected do not include the beginning time and do include the ending time (data files are denoted by the end time). |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 05/24/1996 | 1800 | 05/24/1996 | 2130 |
| Subject: | SGP/EBBR/E13 - Annual Calibration changeout |
| DataStreams: | sgp5ebbrE13.a0, sgp30ebbrE13.a1 |
| Description: | On May 24, 1996 the changeout for annual calibration occurred at E13, Central Facility, OK. Between 1800 and 2130 GMT no data was remotely collected. Furthermore, 5 minute data inbetween 1800 and 2130 is incorrect, 15 minute data between 1800 and 2130 is incorrect, and 30 minute data for 2130 GMT is incorrect. A large jump in soil moisture appears in the data after the installation was completed (the soil bags holding the probes had a greater than ambient soil moisture). Soil measurements indicated greater than ambient soil moisture until a rain just after 0600 GMT on 1 June saturated the soil; after this period the probes reflected actual soil moisture conditions. The larger than normal soil moistures have some impact on the soil heat flux during this time of year, and thus soil heat flux from the soil flow plates and soil temperature probes, as well as average soil heat flux, computed sensible and latent heat fluxes; these quantities should be considered to be incorrect from 24 June at 2130 GMT until about 1200 GMT on June 1. Because of communication problems, data is missing from the time of the EBBR installation until 29 May 1996 at about 1815 GMT. This data may be recovered from the sneakernetted data set. |
| Measurements: | sgp5ebbrE13.a0:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/20/1996 | 0700 | 08/30/1996 | 1830 |
| Subject: | SGP/EBBR/E13 - Wind Direction Incorrect |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | Wind direction was incorrect during the period indicated due to a sensor electronics failure. On 30 August 1996 site operations replaced S/N K3035 with S/N K3034. Correct data collection resumed. Values that are incorrect for the period are: 5 minute: wind_d, res_ws, sigma_wd 15 minute: mv_wind_d 30 minute: wind_d, res_ws, sigma_wd |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/18/1996 | 1942 | 11/18/1996 | 2022 |
| Subject: | SGP/EBBR/E13 - EBBR 3 Month Checks - 10 EFs |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| 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: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/07/1997 | 0530 | 02/07/1997 | 1340 |
| Subject: | SGP/EBBR/E13 - Frozen Wind Speed Sensor |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | On February 7, 1997 freezing rain stopped the cups of the EBBR wind speed instrument at the Central Facility (E13). All 5, 15, and 30 minute data values indicated below are incorrect for the period listed. 5 minute: wind_s, res_ws 15 minute: wind_s 30 minute: wind_s, res_ws |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/17/1997 | 0930 | 07/25/1997 | 1600 |
| Subject: | SGP/EBBR/E13 - CR10 Malfunction |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | The CR10 apparently malfunctioned on 17 July 1997. This caused a variety of effects, including incorrect datalogger clock times, missing data periods, and some corrupted data fields. The CR10 was replaced on 25 July 1997; all data fields are now correct. Data users may contact the mentor for more detailed information on data quality during this period. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 07/22/1997 | 0000 | 07/22/1997 | 2359 |
| 07/23/1997 | 0000 | 07/23/1997 | 2359 |
| 07/24/1997 | 0000 | 07/24/1997 | 2359 |
| Subject: | SGP/EBBR/E13 - Missing Data |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | The EBBR EF13 data during the periods indicated are missing. This may be related to a CR10X clock problem that was observed at the time by the SDS. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/28/1997 | 1419 | 04/28/1997 | 1445 |
| Subject: | SGP/EBBR/E13 - EBBR Biannual Checks |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| 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: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/1998 | 0625 | 01/05/1998 | 0115 |
| Subject: | SGP/EBBR/E13- EBBR Frozen Wind Speed |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | Wind speed cups were frozen during the indicated time periods. All 5, 15, and 30 minute data values indicated are incorrect for the periods listed. |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/04/1998 | 0745 | 01/16/1998 | 1600 |
| Subject: | SGP/EBBR/E13 - EBBR AEMs Not Exchanging (Iced Or Fuse Blown) |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| Description: | 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: Note: Mentor supplied the end date/time for this DQR after submittal |
| Measurements: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/10/1997 | 1850 | 10/10/1997 | 1932 |
| Subject: | SGP/EBBR/E13 - 3-Month Check |
| DataStreams: | sgp5ebbrE13.a0, sgp15ebbrE13.a1, sgp30ebbrE13.a1 |
| 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: | sgp5ebbrE13.a0:
sgp15ebbrE13.a1:
sgp30ebbrE13.a1:
|