DQRs for Session: 129809 User:gliuCompleted: 08-17-2010

Data Quality Reports for Session: 129809 User: gliu Completed: 08/17/2010

TABLE OF CONTENTS

DQR ID	Subject	Data Streams Affected
D020313.1	SGP/THWAPS/C1 - THWAPS C1 miscalibrated	sgpthwapsC1.a1, sgpthwapsC1.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
D041123.1	SGP/THWAPS/C1 - RH Sensor Calibration	sgpthwapsC1.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
D080116.24	SGP/THWAPS/C1 - RH Data Incorrect	sgpthwapsC1.b1
D090211.2	SGP/THWAPS/C1 - Barometer intermittent	sgpthwapsC1.b1
D090306.1	SGP/THWAPS/C1 - Time stamp of data record incorrect	sgpthwapsC1.b1
D991008.1	SGP/THWAPS - RH values low by factor of 1.1	DsgpthwapsC1.a1, DsgpthwapsC1.b1, sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.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: Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Relative Humidity(sd_rh) Standard Deviation of Air Temperature(sd_temp) Beam 0 Temperature(temp) Relative humidity inside the instrument enclosure(rh) sgpthwapsC1.a1: Standard Deviation of Air Temperature(sd_temp) Standard Deviation of Relative Humidity(sd_rh) Relative humidity inside the instrument enclosure(rh) Vapor Pressure (kiloPascals)(vap_pres) Beam 0 Temperature(temp)

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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: Dummy altitude for Zeb(alt) Mean Wind Speed(wspd) lon(lon) base time(base_time) Standard Deviation of Relative Humidity(sd_rh) Beam 0 Temperature(temp) Unit Vector Wind Direction(wdir) Time offset of tweaks from base_time(time_offset) Standard Deviation of Vapor Pressure(sd_vap_pres) Standard Deviation of Wind Direction(sd_wdir) Retrieved pressure profile(pres) Standard Deviation of Pressure(sd_pres) Relative humidity inside the instrument enclosure(rh) Batter Voltage(vbat) Standard Deviation of Air Temperature(sd_temp) Vapor Pressure (kiloPascals)(vap_pres) lat(lat) sgpthwapsB5.00: null(Raw data stream - documentation not supported) sgpthwapsC1.a1: Standard Deviation of Air Temperature(sd_temp) Beam 0 Temperature(temp) Standard Deviation of Vapor Pressure(sd_vap_pres) Batter Voltage(vbat) lon(lon) Dummy altitude for Zeb(alt) Time offset of tweaks from base_time(time_offset) Relative humidity inside the instrument enclosure(rh) base time(base_time) Standard Deviation of Wind Direction(sd_wdir) Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Pressure(sd_pres) Unit Vector Wind Direction(wdir) Standard Deviation of Relative Humidity(sd_rh) lat(lat) Mean Wind Speed(wspd) Retrieved pressure profile(pres) sgpthwapsB6.a1: Standard Deviation of Wind Direction(sd_wdir) Standard Deviation of Pressure(sd_pres) Mean Wind Speed(wspd) base time(base_time) lon(lon) Standard Deviation of Relative Humidity(sd_rh) Batter Voltage(vbat) Beam 0 Temperature(temp) Unit Vector Wind Direction(wdir) Retrieved pressure profile(pres) Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Vapor Pressure(sd_vap_pres) Standard Deviation of Air Temperature(sd_temp) Relative humidity inside the instrument enclosure(rh) lat(lat) Time offset of tweaks from base_time(time_offset) Dummy altitude for Zeb(alt) sgpthwapsC1.00: null(Raw data stream - documentation not supported) sgpthwapsB6.b1: Relative humidity inside the instrument enclosure(rh) base time(base_time) Standard Deviation of Pressure(sd_pres) Standard Deviation of Relative Humidity(sd_rh) Batter Voltage(vbat) Standard Deviation of Air Temperature(sd_temp) Standard Deviation of Wind Direction(sd_wdir) Unit Vector Wind Direction(wdir) lon(lon) Mean Wind Speed(wspd) Vapor Pressure (kiloPascals)(vap_pres) Retrieved pressure profile(pres) Beam 0 Temperature(temp) Time offset of tweaks from base_time(time_offset) Dummy altitude for Zeb(alt) Standard Deviation of Vapor Pressure(sd_vap_pres) lat(lat) sgpthwapsB1.00: null(Raw data stream - documentation not supported) sgpthwapsB1.b1: Mean Wind Speed(wspd) Vapor Pressure (kiloPascals)(vap_pres) Retrieved pressure profile(pres) Standard Deviation of Vapor Pressure(sd_vap_pres) lat(lat) Relative humidity inside the instrument enclosure(rh) Unit Vector Wind Direction(wdir) Beam 0 Temperature(temp) Time offset of tweaks from base_time(time_offset) Standard Deviation of Air Temperature(sd_temp) lon(lon) Standard Deviation of Relative Humidity(sd_rh) Standard Deviation of Wind Direction(sd_wdir) Batter Voltage(vbat) Dummy altitude for Zeb(alt) base time(base_time) Standard Deviation of Pressure(sd_pres) sgpthwapsB1.a1: Standard Deviation of Wind Direction(sd_wdir) lat(lat) Vapor Pressure (kiloPascals)(vap_pres) base time(base_time) Relative humidity inside the instrument enclosure(rh) Retrieved pressure profile(pres) Standard Deviation of Air Temperature(sd_temp) Time offset of tweaks from base_time(time_offset) Beam 0 Temperature(temp) Standard Deviation of Pressure(sd_pres) lon(lon) Batter Voltage(vbat) Standard Deviation of Vapor Pressure(sd_vap_pres) Unit Vector Wind Direction(wdir) Dummy altitude for Zeb(alt) Standard Deviation of Relative Humidity(sd_rh) Mean Wind Speed(wspd) sgpthwapsB6.00: null(Raw data stream - documentation not supported) sgpthwapsB5.a1: lon(lon) Mean Wind Speed(wspd) lat(lat) Unit Vector Wind Direction(wdir) Relative humidity inside the instrument enclosure(rh) Standard Deviation of Relative Humidity(sd_rh) base time(base_time) Standard Deviation of Pressure(sd_pres) Batter Voltage(vbat) Time offset of tweaks from base_time(time_offset) Dummy altitude for Zeb(alt) Standard Deviation of Vapor Pressure(sd_vap_pres) Beam 0 Temperature(temp) Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Wind Direction(sd_wdir) Retrieved pressure profile(pres) Standard Deviation of Air Temperature(sd_temp) sgpthwapsB5.b1: lon(lon) Standard Deviation of Pressure(sd_pres) Batter Voltage(vbat) Standard Deviation of Vapor Pressure(sd_vap_pres) Relative humidity inside the instrument enclosure(rh) Unit Vector Wind Direction(wdir) Time offset of tweaks from base_time(time_offset) Standard Deviation of Air Temperature(sd_temp) Standard Deviation of Relative Humidity(sd_rh) Dummy altitude for Zeb(alt) Retrieved pressure profile(pres) lat(lat) Vapor Pressure (kiloPascals)(vap_pres) Beam 0 Temperature(temp) Standard Deviation of Wind Direction(sd_wdir) base time(base_time) Mean Wind Speed(wspd)

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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: Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Relative Humidity(sd_rh) Standard Deviation of Vapor Pressure(sd_vap_pres) Relative humidity inside the instrument enclosure(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: Relative humidity inside the instrument enclosure(rh) sgpthwapsC1.a1: Relative humidity inside the instrument enclosure(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: Vapor Pressure (kiloPascals)(vap_pres)

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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: Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Relative Humidity(sd_rh) Standard Deviation of Vapor Pressure(sd_vap_pres) Relative humidity inside the instrument enclosure(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: Retrieved pressure profile(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 of tweaks from base_time(time_offset) base time(base_time)

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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:	DsgpthwapsC1.a1, DsgpthwapsC1.b1, sgpthwapsC1.00, sgpthwapsC1.a1, sgpthwapsC1.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: Vapor Pressure (kiloPascals)(vap_pres) Standard Deviation of Relative Humidity(sd_rh) Standard Deviation of Vapor Pressure(sd_vap_pres) Relative humidity inside the instrument enclosure(rh) sgpthwapsC1.a1: Standard Deviation of Vapor Pressure(sd_vap_pres) Standard Deviation of Relative Humidity(sd_rh) Relative humidity inside the instrument enclosure(rh) Vapor Pressure (kiloPascals)(vap_pres) sgpthwapsC1.00: null(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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