DQRs for Session: 133927 User:joycookCompleted: 03-18-2011

Data Quality Reports for Session: 133927 User: joycook Completed: 03/18/2011

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D020313.1	SGP/THWAPS/C1 - THWAPS C1 miscalibrated	sgpthwapsC1.a1, sgpthwapsC1.b1
D030325.2	SGP/THWAPS/B6 - Loss of temperature and RH for 8 hours	sgpthwapsB6.a1, sgpthwapsB6.b1
D030917.21	SGP/THWAPS/B1/B5/B6/C1 - Missing data due to Ice storm and clock problems	sgpthwapsB1.00, sgpthwapsB1.a1, sgpthwapsB1.b1, sgpthwapsB5.00, sgpthwapsB5.a1, sgpthwapsB5.b1, sgpthwapsB6.00, sgpthwapsB6.a1, sgpthwapsB6.b1, sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.b1
D031205.1	SGP/THWAPS/B5 - T/RH Sensor Failure	sgpthwapsB5.b1
D031213.1	SGP/THWAPS/B6 - Battery Voltage Problem	sgpthwapsB6.b1
D041123.1	SGP/THWAPS/C1 - RH Sensor Calibration	sgpthwapsC1.b1
D050205.5	SGP/THWAPS/B5 - Temperature Sensor failure	sgpthwapsB5.b1
D050209.14	SGP/THWAPS/B1 - Wind Data Suspect	sgpthwapsB1.b1
D050209.15	SGP/THWAPS/B4 - Wind Data Suspect	sgpthwapsB4.b1
D050209.16	SGP/THWAPS/B5 - Wind Data Suspect	sgpthwapsB5.b1
D050209.17	SGP/THWAPS/B6 - Wind Data Suspect	sgpthwapsB6.b1
D050812.1	SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressure	sgpthwapsB4.b1
D050812.10	SGP/THWAPS/C1 - Minor bias in humidity	sgpthwapsC1.a1, sgpthwapsC1.b1
D050812.12	SGP/THWAPS/C1 - Minor bias in saturation vapor pressure	sgpthwapsC1.b1
D050812.4	SGP/THWAPS/B5 - Minor biases in humidity and saturation vapor pressure	sgpthwapsB5.b1
D050812.7	SGP/THWAPS/B6 - Minor biases in humidity and saturation vapor pressure	sgpthwapsB6.b1
D050813.1	SGP/THWAPS/B1 - Minor bias in humidity	sgpthwapsB1.a1, sgpthwapsB1.b1
D050813.2	SGP/THWAPS/B1 - Minor bias in saturation vapor pressure	sgpthwapsB1.b1
D050913.1	SGP/THWAPS/B4 - RH values exceeding 105%	sgpthwapsB4.b1
D051027.2	SGP/THWAPS/B4 - Time uncertainty	sgpthwapsB4.b1
D060307.2	SGP/THWAPS/B6 - Wind Speed values near zero	sgpthwapsB6.b1
D060717.1	SGP/THWAPS/B4 - Temp and RH data incorrect	sgpthwapsB4.b1
D060830.1	SGP/THWAPS/B4 - Reprocess: RH% values 9% High	sgpthwapsB4.b1
D070221.2	SGP/THWAPS/B6 - Wind Speed Data Artificially Low	sgpthwapsB6.b1
D070221.3	SGP/THWAPS/B5 - Wind Speed and Direction Data Incorrect	sgpthwapsB5.b1
D071010.2	SGP/THWAPS/B5 - Reprocess: RH values 10% Above Actual	sgpthwapsB5.b1
D080116.19	SGP/THWAPS/B1 - Wind Data Incorrect Due to Icing	sgpthwapsB1.b1
D080116.20	SGP/THWAPS/B1 - T/RH Data Incorrect	sgpthwapsB1.b1
D080116.21	SGP/THWAPS/B5 - Wind Data Incorrect Due to Icing	sgpthwapsB5.b1
D080116.22	SGP/THWAPS/B6 - Wind Data Incorrect Due to Icing	sgpthwapsB6.b1
D080116.23	SGP/THWAPS/B4 - Wind Data Incorrect Due to Icing	sgpthwapsB4.b1
D080116.24	SGP/THWAPS/C1 - RH Data Incorrect	sgpthwapsC1.b1
D080326.1	SGP/THWAPS/B4 - Temp and RH values incorrect during hours of no sunlight	sgpthwapsB4.b1
D080806.1	SGP/THWAPS/B6 - Wind Speed Values Incorrect	sgpthwapsB6.b1
D090114.5	SGP/THWAPS/B4 - RH sensor failure	sgpthwapsB4.b1
D090211.2	SGP/THWAPS/C1 - Barometer intermittent	sgpthwapsC1.b1
D090306.1	SGP/THWAPS/C1 - Time stamp of data record incorrect	sgpthwapsC1.b1
D090824.2	SGP/THWAPS/C1 - Wind speed incorrect	sgpthwapsC1.b1
D991001.1	SGP/THWAPS - Broken anemometer at B5 THWAPS	sgpthwapsB5.00, sgpthwapsB5.a1, sgpthwapsB5.b1, DsgpthwapsB5.00, DsgpthwapsB5.a1, DsgpthwapsB5.b1
D991008.1	SGP/THWAPS - RH values low by factor of 1.1	sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.b1, DsgpthwapsC1.a1, DsgpthwapsC1.b1
D991008.2	SGP/THWAPS - RH low by factor of 1.1	sgpthwapsB1.00, sgpthwapsB1.a1, sgpthwapsB1.b1

DQRID : D020313.1

Start Date	Start Time	End Date	End Time
03/09/2002	0340	04/23/2002	1418

Subject:	SGP/THWAPS/C1 - THWAPS C1 miscalibrated
DataStreams:	sgpthwapsC1.a1, sgpthwapsC1.b1
Description:	Power outages apparently led to the THWAPS HMP233 temperature and RH sensor being replaced at C1. The power went out at 0340 on 3/9 was restored at 0635 and went out again at 2025. The new HMP233 appears to be incorrectly calibrated and all temperature data since its installation are wrong. If I am correct about the nature of the calibration problem, the true average temperature can be recovered from that recorded by a linear conversion, but I don't think its worth the trouble.
Measurements:	sgpthwapsC1.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative, 30-min intervals, standard deviation(sd_rh) Temperature, air, 30-min intervals, standard deviation(sd_temp) Temperature, air(temp) Humidity, relative(rh) sgpthwapsC1.a1: Temperature, air, 30-min intervals, standard deviation(sd_temp) Humidity, relative, 30-min intervals, standard deviation(sd_rh) Humidity, relative(rh) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Temperature, air(temp)

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DQRID : D030325.2

Start Date	Start Time	End Date	End Time
03/18/2003	1430	03/18/2003	2205

Subject:	SGP/THWAPS/B6 - Loss of temperature and RH for 8 hours
DataStreams:	sgpthwapsB6.a1, sgpthwapsB6.b1
Description:	The UPS for this system failed resulting in loss of power to the HMP233 unit. As a result, the temperature and RH values were read as zero by the data logger. SiteOps replaced the UPS and all appears well now.
Measurements:	sgpthwapsB6.a1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres Temperature, air(temp) Temperature, air, 30-min intervals, standard deviation(sd_temp) Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh) sgpthwapsB6.b1: Temperature, air, 30-min intervals, standard deviation(sd_temp) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Temperature, air(temp) Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh) sd_pres sd_vap_pres

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DQRID : D030917.21

Start Date	Start Time	End Date	End Time
03/09/2002	2055	03/11/2002	2005
03/13/2002	1755	03/14/2002	1505

Subject:	SGP/THWAPS/B1/B5/B6/C1 - Missing data due to Ice storm and clock problems
DataStreams:	sgpthwapsB1.00, sgpthwapsB1.a1, sgpthwapsB1.b1, sgpthwapsB5.00, sgpthwapsB5.a1, sgpthwapsB5.b1, sgpthwapsB6.00, sgpthwapsB6.a1, sgpthwapsB6.b1, sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.b1
Description:	Data are missing due to power failures caused by an ice storm and resulting system/instrument clock problems.
Measurements:	sgpthwapsC1.b1: alt Mean Wind Speed(wspd) lon base_time Humidity, relative, 30-min intervals, standard deviation(sd_rh) Temperature, air(temp) Unit Vector Wind Direction(wdir) time_offset sd_vap_pres sd_wdir Pressure, atmospheric, constant value of model level, RUC model output(pres) sd_pres Humidity, relative(rh) vbat Temperature, air, 30-min intervals, standard deviation(sd_temp) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) lat sgpthwapsB5.00: Raw data stream - documentation not supported sgpthwapsC1.a1: Temperature, air, 30-min intervals, standard deviation(sd_temp) Temperature, air(temp) sd_vap_pres vbat lon alt time_offset Humidity, relative(rh) base_time sd_wdir Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_pres Unit Vector Wind Direction(wdir) Humidity, relative, 30-min intervals, standard deviation(sd_rh) lat Mean Wind Speed(wspd) Pressure, atmospheric, constant value of model level, RUC model output(pres) sgpthwapsB6.a1: sd_wdir sd_pres Mean Wind Speed(wspd) base_time lon Humidity, relative, 30-min intervals, standard deviation(sd_rh) vbat Temperature, air(temp) Unit Vector Wind Direction(wdir) Pressure, atmospheric, constant value of model level, RUC model output(pres) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres Temperature, air, 30-min intervals, standard deviation(sd_temp) Humidity, relative(rh) lat time_offset alt sgpthwapsC1.00: Raw data stream - documentation not supported sgpthwapsB6.b1: Humidity, relative(rh) base_time sd_pres Humidity, relative, 30-min intervals, standard deviation(sd_rh) vbat Temperature, air, 30-min intervals, standard deviation(sd_temp) sd_wdir Unit Vector Wind Direction(wdir) lon Mean Wind Speed(wspd) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Pressure, atmospheric, constant value of model level, RUC model output(pres) Temperature, air(temp) time_offset alt sd_vap_pres lat sgpthwapsB1.00: Raw data stream - documentation not supported sgpthwapsB1.b1: Mean Wind Speed(wspd) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Pressure, atmospheric, constant value of model level, RUC model output(pres) sd_vap_pres lat Humidity, relative(rh) Unit Vector Wind Direction(wdir) Temperature, air(temp) time_offset Temperature, air, 30-min intervals, standard deviation(sd_temp) lon Humidity, relative, 30-min intervals, standard deviation(sd_rh) sd_wdir vbat alt base_time sd_pres sgpthwapsB1.a1: sd_wdir lat Pressure, vapor, 60-m height, 30-min intervals(vap_pres) base_time Humidity, relative(rh) Pressure, atmospheric, constant value of model level, RUC model output(pres) Temperature, air, 30-min intervals, standard deviation(sd_temp) time_offset Temperature, air(temp) sd_pres lon vbat sd_vap_pres Unit Vector Wind Direction(wdir) alt Humidity, relative, 30-min intervals, standard deviation(sd_rh) Mean Wind Speed(wspd) sgpthwapsB6.00: Raw data stream - documentation not supported sgpthwapsB5.a1: lon Mean Wind Speed(wspd) lat Unit Vector Wind Direction(wdir) Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh) base_time sd_pres vbat time_offset alt sd_vap_pres Temperature, air(temp) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_wdir Pressure, atmospheric, constant value of model level, RUC model output(pres) Temperature, air, 30-min intervals, standard deviation(sd_temp) sgpthwapsB5.b1: lon sd_pres vbat sd_vap_pres Humidity, relative(rh) Unit Vector Wind Direction(wdir) time_offset Temperature, air, 30-min intervals, standard deviation(sd_temp) Humidity, relative, 30-min intervals, standard deviation(sd_rh) alt Pressure, atmospheric, constant value of model level, RUC model output(pres) lat Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Temperature, air(temp) sd_wdir base_time Mean Wind Speed(wspd)

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DQRID : D031205.1

Start Date	Start Time	End Date	End Time
12/04/2003	1605	12/23/2003	1940

Subject:	SGP/THWAPS/B5 - T/RH Sensor Failure
DataStreams:	sgpthwapsB5.b1
Description:	The T/H sensor cable was chewed in half by a rodent. Cable was replaced and reasonable data resumed after the transmitter was adjusted 12/23.
Measurements:	sgpthwapsB5.b1: Temperature, air(temp) Temperature, air, 30-min intervals, standard deviation(sd_temp) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative, 30-min intervals, standard deviation(sd_rh) Humidity, relative(rh) sd_vap_pres

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DQRID : D031213.1

Start Date	Start Time	End Date	End Time
12/06/2003	0345	12/22/2003	2217

Subject:	SGP/THWAPS/B6 - Battery Voltage Problem
DataStreams:	sgpthwapsB6.b1
Description:	Power supply failed and was replaced. Data were intermittently incorrect and very spiky.
Measurements:	sgpthwapsB6.b1: vbat Temperature, air, 30-min intervals, standard deviation(sd_temp) Unit Vector Wind Direction(wdir) Mean Wind Speed(wspd) Pressure, atmospheric, constant value of model level, RUC model output(pres) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Temperature, air(temp) Humidity, relative(rh) sd_wdir base_time Humidity, relative, 30-min intervals, standard deviation(sd_rh) sd_pres sd_vap_pres

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DQRID : D041123.1

Start Date	Start Time	End Date	End Time
11/16/2004	2135	11/29/2004	1930

Subject:	SGP/THWAPS/C1 - RH Sensor Calibration
DataStreams:	sgpthwapsC1.b1
Description:	The analog output for the T/RH probe was incorrectly calibrated. This caused excessively high readings of RH.
Measurements:	sgpthwapsC1.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative, 30-min intervals, standard deviation(sd_rh) sd_vap_pres Humidity, relative(rh)

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DQRID : D050205.5

Start Date	Start Time	End Date	End Time
02/03/2005	2315	02/16/2005	1850

Subject:	SGP/THWAPS/B5 - Temperature Sensor failure
DataStreams:	sgpthwapsB5.b1
Description:	Temperature readings exceed 50 deg C. Temperature sensor failed and was replaced.
Measurements:	sgpthwapsB5.b1: Temperature, air(temp) Temperature, air, 30-min intervals, standard deviation(sd_temp) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres

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DQRID : D050209.14

Start Date	Start Time	End Date	End Time
01/03/2005	0000	01/09/2005	2359

Subject:	SGP/THWAPS/B1 - Wind Data Suspect
DataStreams:	sgpthwapsB1.b1
Description:	Wind speed and direction data suspect during time period due to icing.
Measurements:	sgpthwapsB1.b1: sd_wdir Mean Wind Speed(wspd) Unit Vector Wind Direction(wdir)

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DQRID : D050209.15

Start Date	Start Time	End Date	End Time
01/04/2005	0000	01/17/2005	2359

Subject:	SGP/THWAPS/B4 - Wind Data Suspect
DataStreams:	sgpthwapsB4.b1
Description:	Wind speed and direction data suspect during time period due to icing.
Measurements:	sgpthwapsB4.b1: sd_wdir Unit Vector Wind Direction(wdir) Mean Wind Speed(wspd)

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DQRID : D050209.16

Start Date	Start Time	End Date	End Time
02/03/2005	0000	02/03/2005	2359

Subject:	SGP/THWAPS/B5 - Wind Data Suspect
DataStreams:	sgpthwapsB5.b1
Description:	Wind speed and direction data intermittently low throughout time period due to icing on sensor.
Measurements:	sgpthwapsB5.b1: sd_wdir Mean Wind Speed(wspd) Unit Vector Wind Direction(wdir)

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DQRID : D050209.17

Start Date	Start Time	End Date	End Time
02/04/2005	0000	02/04/2005	2359

Subject:	SGP/THWAPS/B6 - Wind Data Suspect
DataStreams:	sgpthwapsB6.b1
Description:	Wind speed and direction data intermittently low throughout time period due to icing on sensor.
Measurements:	sgpthwapsB6.b1: Unit Vector Wind Direction(wdir) sd_wdir Mean Wind Speed(wspd)

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DQRID : D050812.1

Start Date	Start Time	End Date	End Time
09/21/1999	0000	07/30/2005	1722

Subject:	SGP/THWAPS/B4 - Minor biases in humidity and saturation vapor pressure
DataStreams:	sgpthwapsB4.b1
Description:	The THWAPS humidity sensor output was scaled so that the instrument output voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities because of this 100 %RH maximum. The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This resulted in a slight loss of precision in the measurements, but since the RH measurement is only accurate to 2-3 %RH at best, this isn't a significant problem. The saturation vapor correction when temps are below 0C contained an error in the multiplier. The incorrect multiplier only equates to an error of 0.01 kPa which is less than the stated uncertainty of the measurement (+/- 0.035 kPa).
Measurements:	sgpthwapsB4.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative(rh)

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DQRID : D050812.10

Start Date	Start Time	End Date	End Time
09/21/1999	0000	12/07/1999	1100

Subject:	SGP/THWAPS/C1 - Minor bias in humidity
DataStreams:	sgpthwapsC1.a1, sgpthwapsC1.b1
Description:	The THWAPS humidity sensor output was scaled so that the instrument output voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities because of this 100 %RH maximum. The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This resulted in a slight loss of precision in the measurements, but since the RH measurement is only accurate to 2-3 %RH at best, this isn't a significant problem.
Measurements:	sgpthwapsC1.b1: Humidity, relative(rh) sgpthwapsC1.a1: Humidity, relative(rh)

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DQRID : D050812.12

Start Date	Start Time	End Date	End Time
09/21/1999	0000	08/10/2005	1445

Subject:	SGP/THWAPS/C1 - Minor bias in saturation vapor pressure
DataStreams:	sgpthwapsC1.b1
Description:	The saturation vapor correction when temps are below 0C contained an error in the multiplier. The incorrect multiplier only equates to an error of 0.01 kPa which is less than the stated uncertainty of the measurement (+/- 0.035 kPa).
Measurements:	sgpthwapsC1.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres)

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DQRID : D050812.4

Start Date	Start Time	End Date	End Time
09/21/1999	0000	07/31/2005	1714

Subject:	SGP/THWAPS/B5 - Minor biases in humidity and saturation vapor pressure
DataStreams:	sgpthwapsB5.b1
Description:	The THWAPS humidity sensor output was scaled so that the instrument output voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities because of this 100 %RH maximum. The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This resulted in a slight loss of precision in the measurements, but since the RH measurement is only accurate to 2-3 %RH at best, this isn't a significant problem. The saturation vapor correction when temps are below 0C contained an error in the multiplier. The incorrect multiplier only equates to an error of 0.01 kPa which is less than the stated uncertainty of the measurement (+/- 0.035 kPa).
Measurements:	sgpthwapsB5.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative(rh)

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DQRID : D050812.7

Start Date	Start Time	End Date	End Time
09/21/1999	0000	07/30/2005	2355

Subject:	SGP/THWAPS/B6 - Minor biases in humidity and saturation vapor pressure
DataStreams:	sgpthwapsB6.b1
Description:	The THWAPS humidity sensor output was scaled so that the instrument output voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities because of this 100 %RH maximum. The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This resulted in a slight loss of precision in the measurements, but since the RH measurement is only accurate to 2-3 %RH at best, this isn't a significant problem. The saturation vapor correction when temps are below 0C contained an error in the multiplier. The incorrect multiplier only equates to an error of 0.01 kPa which is less than the stated uncertainty of the measurement (+/- 0.035 kPa).
Measurements:	sgpthwapsB6.b1: Humidity, relative(rh) Pressure, vapor, 60-m height, 30-min intervals(vap_pres)

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DQRID : D050813.1

Start Date	Start Time	End Date	End Time
09/21/1999	0000	12/07/1999	1800

Subject:	SGP/THWAPS/B1 - Minor bias in humidity
DataStreams:	sgpthwapsB1.a1, sgpthwapsB1.b1
Description:	The THWAPS humidity sensor output was scaled so that the instrument output voltage range (0-1VDC) represented 0-100 %RH. Comparisons with the co-located chilled mirror sensor at the CF suggested that the THWAPS RH sensor was reading artifically low at high humidities because of this 100 %RH maximum. The scaling of the system was changed so that 0-1 VDC now represents 0-110 %RH. This resulted in a slight loss of precision in the measurements, but since the RH measurement is only accurate to 2-3 %RH at best, this isn't a significant problem.
Measurements:	sgpthwapsB1.b1: Humidity, relative(rh) sgpthwapsB1.a1: Humidity, relative(rh)

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DQRID : D050813.2

Start Date	Start Time	End Date	End Time
09/21/1999	0000	08/01/2005	2034

Subject:	SGP/THWAPS/B1 - Minor bias in saturation vapor pressure
DataStreams:	sgpthwapsB1.b1
Description:	The saturation vapor correction when temps are below 0C contained an error in the multiplier. The incorrect multiplier only equates to an error of 0.01 kPa which is less than the stated uncertainty of the measurement (+/- 0.035 kPa).
Measurements:	sgpthwapsB1.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres)

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DQRID : D050913.1

Start Date	Start Time	End Date	End Time
08/06/2005	0000	10/03/2005	1730

Subject:	SGP/THWAPS/B4 - RH values exceeding 105%
DataStreams:	sgpthwapsB4.b1
Description:	RH measurements were reaching the max value of 105% on a consistent basis. Spider web internal to the sensor housing was found and removed.
Measurements:	sgpthwapsB4.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh)

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DQRID : D051027.2

Start Date	Start Time	End Date	End Time
10/20/2005	1800	10/21/2005	1500

Subject:	SGP/THWAPS/B4 - Time uncertainty
DataStreams:	sgpthwapsB4.b1
Description:	The clock on the site collection system was incorrect when it was deployed on 10/20. The clock was corrected on 10/21 at approximately 15:02. The data collected in the interim received grossly wrong time stamps. These time stamps have been manually corrected, but there is some uncertainty in the time stamps still. Data during the period specified should be considered to be within +/- 5 minutes of the timestamp indicated.
Measurements:	sgpthwapsB4.b1: time_offset Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Temperature, air(temp) Pressure, atmospheric, constant value of model level, RUC model output(pres) Unit Vector Wind Direction(wdir) Humidity, relative(rh) base_time Mean Wind Speed(wspd)

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DQRID : D060307.2

Start Date	Start Time	End Date	End Time
02/12/2006	2155	03/14/2006	2320

Subject:	SGP/THWAPS/B6 - Wind Speed values near zero
DataStreams:	sgpthwapsB6.b1
Description:	The wind sensor reported speeds near zero during period due to propeller falling off. Propeller was replaced.
Measurements:	sgpthwapsB6.b1: Mean Wind Speed(wspd)

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DQRID : D060717.1

Start Date	Start Time	End Date	End Time
07/05/2006	1800	07/18/2006	1647

Subject:	SGP/THWAPS/B4 - Temp and RH data incorrect
DataStreams:	sgpthwapsB4.b1
Description:	After sensor replacement the temperature values are too low. The range of the sensor was incorrectly set at -40 to 80 instead of -30 to 70. RH values are also suspect.
Measurements:	sgpthwapsB4.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres Temperature, air(temp) Temperature, air, 30-min intervals, standard deviation(sd_temp) Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh)

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DQRID : D060830.1

Start Date	Start Time	End Date	End Time
07/05/2006	1825	09/26/2006	0000

Subject:	SGP/THWAPS/B4 - Reprocess: RH% values 9% High
DataStreams:	sgpthwapsB4.b1
Description:	After replacement of the THWAPS T/RH sensor the span was incorrectly set to 0-100 instead of 0-110. This caused the RH values to be 9% higher than actual values.
Measurements:	sgpthwapsB4.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative(rh)

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DQRID : D070221.2

Start Date	Start Time	End Date	End Time
01/12/2007	1500	01/17/2007	0910

Subject:	SGP/THWAPS/B6 - Wind Speed Data Artificially Low
DataStreams:	sgpthwapsB6.b1
Description:	The wind speed data is lower than surrounding sites during this time period. Icing conditions were occurring leading to the lower wind speeds as the sensor was artificially slowed.
Measurements:	sgpthwapsB6.b1: Mean Wind Speed(wspd)

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DQRID : D070221.3

Start Date	Start Time	End Date	End Time
01/14/2007	0000	01/18/2007	1010

Subject:	SGP/THWAPS/B5 - Wind Speed and Direction Data Incorrect
DataStreams:	sgpthwapsB5.b1
Description:	Wind speed and direction data were incorrect as the sensor was frozen.
Measurements:	sgpthwapsB5.b1: sd_wdir Mean Wind Speed(wspd) Unit Vector Wind Direction(wdir)

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DQRID : D071010.2

Start Date	Start Time	End Date	End Time
09/17/2007	1920	10/11/2007	1620

Subject:	SGP/THWAPS/B5 - Reprocess: RH values 10% Above Actual
DataStreams:	sgpthwapsB5.b1
Description:	The T/RH probe was replaced with a recently calibrated sensor. The newly installed probe did not have the correct span 0-110% RH for output. This caused the readings to artificially high by 10%.
Measurements:	sgpthwapsB5.b1: Humidity, relative, 30-min intervals, standard deviation(sd_rh) Humidity, relative(rh)

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DQRID : D080116.19

Start Date	Start Time	End Date	End Time
12/10/2007	2050	12/11/2007	2213

Subject:	SGP/THWAPS/B1 - Wind Data Incorrect Due to Icing
DataStreams:	sgpthwapsB1.b1
Description:	An ice storm caused the wind data from the RM Young wind sensor to be incorrect. In many instances it was frozen and unmoving, at times it measured values but those are extremely suspect.
Measurements:	sgpthwapsB1.b1: sd_wdir Mean Wind Speed(wspd) Unit Vector Wind Direction(wdir)

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DQRID : D080116.20

Start Date	Start Time	End Date	End Time
12/16/2007	2306	12/20/2007	1806

Subject:	SGP/THWAPS/B1 - T/RH Data Incorrect
DataStreams:	sgpthwapsB1.b1
Description:	The T/RH data was incorrect during the listed time period. Reason unknown. The sensor recovered on it's own.
Measurements:	sgpthwapsB1.b1: sd_vap_pres Humidity, relative, 30-min intervals, standard deviation(sd_rh) Temperature, air(temp) Humidity, relative(rh) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Temperature, air, 30-min intervals, standard deviation(sd_temp)

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DQRID : D080116.21

Start Date	Start Time	End Date	End Time
12/09/2007	2340	12/11/2007	1150

Subject:	SGP/THWAPS/B5 - Wind Data Incorrect Due to Icing
DataStreams:	sgpthwapsB5.b1
Description:	An ice storm caused the wind data from the RM Young wind sensor to be incorrect. In many instances it was frozen and unmoving, at times it measured values but those are extremely suspect.
Measurements:	sgpthwapsB5.b1: sd_wdir Mean Wind Speed(wspd) Unit Vector Wind Direction(wdir)

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DQRID : D080116.22

Start Date	Start Time	End Date	End Time
12/10/2007	1035	12/11/2007	1025

Subject:	SGP/THWAPS/B6 - Wind Data Incorrect Due to Icing
DataStreams:	sgpthwapsB6.b1
Description:	An ice storm caused the wind data from the RM Young wind sensor to be incorrect. In many instances it was frozen and unmoving, at times it measured values but those are extremely suspect.
Measurements:	sgpthwapsB6.b1: Unit Vector Wind Direction(wdir) sd_wdir Mean Wind Speed(wspd)

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DQRID : D080116.23

Start Date	Start Time	End Date	End Time
12/10/2007	2110	12/11/2007	1645

Subject:	SGP/THWAPS/B4 - Wind Data Incorrect Due to Icing
DataStreams:	sgpthwapsB4.b1
Description:	An ice storm caused the wind data from the RM Young wind sensor to be incorrect. In many instances it was frozen and unmoving, at times it measured values but those are extremely suspect.
Measurements:	sgpthwapsB4.b1: sd_wdir Unit Vector Wind Direction(wdir) Mean Wind Speed(wspd)

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DQRID : D080116.24

Start Date	Start Time	End Date	End Time
12/22/2007	1750	12/22/2007	2130

Subject:	SGP/THWAPS/C1 - RH Data Incorrect
DataStreams:	sgpthwapsC1.b1
Description:	The RH data was incorrect during the times listed. Reason unknown. The sensor recovered on its own.
Measurements:	sgpthwapsC1.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative, 30-min intervals, standard deviation(sd_rh) sd_vap_pres Humidity, relative(rh)

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DQRID : D080326.1

Start Date	Start Time	End Date	End Time
03/15/2008	0000	11/05/2008	1745

Subject:	SGP/THWAPS/B4 - Temp and RH values incorrect during hours of no sunlight
DataStreams:	sgpthwapsB4.b1
Description:	Unknown issues caused the temp and RH values to become lower during non-sunlight hours. The affects are best seen at sunrise and sunset when the data would adjust upward or downward abruptly. Plots of the standard deviation show abrupt spikes at these times. Comparison plots to nearby mesonet sites suggest the nighttime values of both temp and RH are lower than nearby sites. This problem was also very intermittent and was not occurring on a daily basis. A complete move of the sensors and collection system to a separate building repaired the problem.
Measurements:	sgpthwapsB4.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_pres sd_vap_pres Temperature, air(temp) Temperature, air, 30-min intervals, standard deviation(sd_temp) Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh)

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DQRID : D080806.1

Start Date	Start Time	End Date	End Time
07/31/2008	2030	08/28/2008	1615

Subject:	SGP/THWAPS/B6 - Wind Speed Values Incorrect
DataStreams:	sgpthwapsB6.b1
Description:	The wind speed dropped to ~0 m/s (0.007 m/s) and maintained a flatline at this value. The propeller retaining screw had loosened and the propeller fell off. Propeller was replaced.
Measurements:	sgpthwapsB6.b1: Mean Wind Speed(wspd)

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DQRID : D090114.5

Start Date	Start Time	End Date	End Time
01/04/2009	0400	02/04/2009	1815

Subject:	SGP/THWAPS/B4 - RH sensor failure
DataStreams:	sgpthwapsB4.b1
Description:	RH values dropped to ~20% below those recorded at nearby sites and occasionally flatlined at 0%. RH sensor was replaced.
Measurements:	sgpthwapsB4.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh)

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DQRID : D090211.2

Start Date	Start Time	End Date	End Time
01/09/2009	0000	02/13/2009	2359

Subject:	SGP/THWAPS/C1 - Barometer intermittent
DataStreams:	sgpthwapsC1.b1
Description:	Intermittent dropouts on the barometer data were occurring, with data reading low or missing. Loose wiring was the probable culprit. In most instances, only 1 minute of data was missing. Linear interpolation between the last known good point and the first good point following the dropout can be accomplished.
Measurements:	sgpthwapsC1.b1: Pressure, atmospheric, constant value of model level, RUC model output(pres)

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DQRID : D090306.1

Start Date	Start Time	End Date	End Time
12/09/2008	0000	01/23/2009	2359

Subject:	SGP/THWAPS/C1 - Time stamp of data record incorrect
DataStreams:	sgpthwapsC1.b1
Description:	Due to problems with the collector system, the datalogger was being time synched inappropriately. This problem was intermittent and did not affect every time stamp. The worst case time adjustments were approximately +/- 7 minutes. These were infrequent and most of the time adjustments were less than 7 minutes.
Measurements:	sgpthwapsC1.b1: time_offset base_time

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DQRID : D090824.2

Start Date	Start Time	End Date	End Time
07/17/2009	0000	11/27/2009	1745

Subject:	SGP/THWAPS/C1 - Wind speed incorrect
DataStreams:	sgpthwapsC1.b1
Description:	The wind sensor was reporting 0 m/s winds for excessive periods of time and appeared to measure lower wind speeds than nearby co-located wind sensors. Sensor was replaced.
Measurements:	sgpthwapsC1.b1: Mean Wind Speed(wspd)

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DQRID : D991001.1

Start Date	Start Time	End Date	End Time
09/08/1999	0235	09/30/1999	1620

Subject:	SGP/THWAPS - Broken anemometer at B5 THWAPS
DataStreams:	sgpthwapsB5.00, sgpthwapsB5.a1, sgpthwapsB5.b1, DsgpthwapsB5.00, DsgpthwapsB5.a1, DsgpthwapsB5.b1
Description:	The R. M. Young anemometer lost a propellor vane and stopped. This problem was noted by Site Ops and repaired. The wind velocity data during the time the anemometer was broken were recorded as 0.007 m/s.
Measurements:	sgpthwapsB5.00: Raw data stream - documentation not supported DsgpthwapsB5.00: Development raw data stream - documentation not supported DsgpthwapsB5.b1: Development data stream - documentation not supported sgpthwapsB5.a1: lon sd_pres Mean Wind Speed(wspd) lat vbat time_offset Temperature, air(temp) Unit Vector Wind Direction(wdir) alt Humidity, relative(rh) Humidity, relative, 30-min intervals, standard deviation(sd_rh) base_time Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_wdir Temperature, air, 30-min intervals, standard deviation(sd_temp) Pressure, atmospheric, constant value of model level, RUC model output(pres) sd_vap_pres DsgpthwapsB5.a1: Development data stream - documentation not supported sgpthwapsB5.b1: lat lon sd_pres Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Mean Wind Speed(wspd) vbat sd_vap_pres Temperature, air(temp) sd_wdir Humidity, relative, 30-min intervals, standard deviation(sd_rh) Humidity, relative(rh) base_time Unit Vector Wind Direction(wdir) time_offset Temperature, air, 30-min intervals, standard deviation(sd_temp) alt Pressure, atmospheric, constant value of model level, RUC model output(pres)

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DQRID : D991008.1

Start Date	Start Time	End Date	End Time
09/27/1999	1445	10/14/1999	2230

Subject:	SGP/THWAPS - RH values low by factor of 1.1
DataStreams:	sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.b1, DsgpthwapsC1.a1, DsgpthwapsC1.b1
Description:	Because of instrument mentor stupidity, all C1 THWAPS RH data collected from the begin date of this DQR are low by a factor of 1.1. This error also will affect the vapor pressure data. The problem is that the CSI data logger is expecting the data to be scaled 0-100%RH on the range 0-1V, but it is now being scaled 0-110%RH on the range 0-1V.
Measurements:	sgpthwapsC1.b1: Pressure, vapor, 60-m height, 30-min intervals(vap_pres) Humidity, relative, 30-min intervals, standard deviation(sd_rh) sd_vap_pres Humidity, relative(rh) sgpthwapsC1.a1: sd_vap_pres Humidity, relative, 30-min intervals, standard deviation(sd_rh) Humidity, relative(rh) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sgpthwapsC1.00: Raw data stream - documentation not supported DsgpthwapsC1.a1: Development data stream - documentation not supported DsgpthwapsC1.b1: Development data stream - documentation not supported

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DQRID : D991008.2

Start Date	Start Time	End Date	End Time
09/28/1999	1345	10/14/1999	1440

Subject:	SGP/THWAPS - RH low by factor of 1.1
DataStreams:	sgpthwapsB1.00, sgpthwapsB1.a1, sgpthwapsB1.b1
Description:	Because of instrument mentor stupidity, all B1 TWHAPS RH values collected since the specified being date are low by a factor of 1.1. This problem also will affect the vapor pressure values in the file, but the scaling will not be linear. See companion DQR for THWAPS C1 for more detail.
Measurements:	sgpthwapsB1.00: Raw data stream - documentation not supported sgpthwapsB1.b1: sd_vap_pres Humidity, relative, 30-min intervals, standard deviation(sd_rh) Humidity, relative(rh) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sgpthwapsB1.a1: Humidity, relative, 30-min intervals, standard deviation(sd_rh) Pressure, vapor, 60-m height, 30-min intervals(vap_pres) sd_vap_pres Humidity, relative(rh)

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