Data Quality Reports for Session: 117089 User: troyan Completed: 01/21/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060928.4NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdrynsasondewnpnC1.b1
D080325.1NSA/METTWR/C1 - Intermittent missing datansamettwr4hC1.b1
D080326.2NSA/METTWR/C1 - 2m Wind Direction Sensor Freezingnsamettwr4hC1.b1
D080408.2NSA/METTWR/C1 - CMH Intake Fan Failurensamettwr4hC1.b1
D080512.1NSA/MWR/C1 - Spikes in air temperature readingsnsamwrlosC1.b1, nsamwrtipC1.a1
D080611.1NSA/METTWR/C1 - 2m Datalogger Failednsamettwr4hC1.b1
D080612.1NSA/METTWR/C1 - CMH required Calibrationnsamettwr4hC1.b1
D080623.1NSA/MWR/C1 - Missing surface air temperature datansamwrlosC1.b1, nsamwrtipC1.a1
D080731.1NSA/METTWR/C1 - 2m level data incorrectnsamettwr4hC1.b1


DQRID : D060928.4
Start DateStart TimeEnd DateEnd Time
09/29/2006050012/31/99992359
Subject:
NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry
DataStreams:nsasondewnpnC1.b1
Description:
The output precision of the following variables was increased 20060929:

   alt	changed from 1m to 0.1m
   dp	changed from 0.1degC to 0.01degC
   pres changed from 0.1 hPa to 0.01 hPa
   RH	changed from 1%RH to 0.01%RH
   tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase
in accuracy.  Users are cautioned to continue to use their best scientific
judgement when using these or any other data.
Measurements:nsasondewnpnC1.b1:
  • Relative humidity inside the instrument enclosure(rh)
  • Dry bulb temperature(tdry)
  • Dummy altitude for Zeb(alt)
  • Retrieved pressure profile(pres)
  • Surface dew point temperature(dp)

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DQRID : D080325.1
Start DateStart TimeEnd DateEnd Time
03/14/2008201203/31/20080900
Subject:
NSA/METTWR/C1 - Intermittent missing data
DataStreams:nsamettwr4hC1.b1
Description:
Intermittent failure of the CMH to communicate with the logging system occurred on a daily 
basis.  This problem occurred anywhere from 4 to 8 hrs.  Problem began after maintenance 
to replace failing aspirator fan on 03/13/2008.
Measurements:nsamettwr4hC1.b1:
  • Chilled Mirror Calculated Vapor Pressure(VPCMH)
  • Chilled Mirror Calculated Relative Humidity(CMHRH)
  • Chilled Mirror Dew Point(CMHDP)
  • Chilled Mirror Temperature(CMHTemp)
  • Chilled Mirror Calculated Saturation Vapor Pressure(SatVPCMH)

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DQRID : D080326.2
Start DateStart TimeEnd DateEnd Time
01/05/2008000003/27/20081730
Subject:
NSA/METTWR/C1 - 2m Wind Direction Sensor Freezing
DataStreams:nsamettwr4hC1.b1
Description:
The 2m wind direction was failing.  It began to exhibit instances of no movement 
suggesting it was frozen.  After some time it began to make erratic measurements compared to the 
co-located Ultrasonic and compared to the directions at the other levels.
Measurements:nsamettwr4hC1.b1:
  • Standard Deviation of 2m Vector Averaged Wind Direction(WD2M_SDU_WVT)
  • 2m Vector Averaged Wind Direction(WD2M_DU_WVT)

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DQRID : D080408.2
Start DateStart TimeEnd DateEnd Time
03/07/2008120003/13/20082345
Subject:
NSA/METTWR/C1 - CMH Intake Fan Failure
DataStreams:nsamettwr4hC1.b1
Description:
The CMH intake fan failed causing the dew point and temp data to be incorrect.

If users need only T/RH and derived variables they can use the 2m data collected using the 
HMP-45D probes.  CMH data are unrecoverable.
Measurements:nsamettwr4hC1.b1:
  • Chilled Mirror Calculated Vapor Pressure(VPCMH)
  • Chilled Mirror Calculated Relative Humidity(CMHRH)
  • Chilled Mirror Dew Point(CMHDP)
  • Chilled Mirror Temperature(CMHTemp)
  • Chilled Mirror Calculated Saturation Vapor Pressure(SatVPCMH)

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DQRID : D080512.1
Start DateStart TimeEnd DateEnd Time
04/02/2008000006/04/20082200
Subject:
NSA/MWR/C1 - Spikes in air temperature readings
DataStreams:nsamwrlosC1.b1, nsamwrtipC1.a1
Description:
During this month there are occasional negative spikes in the Tkair variable. The problem 
may be corrosion in the temperature sensor or the infiltration of water from melting snow.
The dewblower was replaced and a new sensor installed
Measurements:nsamwrlosC1.b1:
  • Ambient temperature(tkair)
nsamwrtipC1.a1:
  • Ambient temperature(tkair)

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DQRID : D080611.1
Start DateStart TimeEnd DateEnd Time
06/09/2008231906/11/20082222
Subject:
NSA/METTWR/C1 - 2m Datalogger Failed
DataStreams:nsamettwr4hC1.b1
Description:
The 2m temperature, wind speed, wind direction, and relative humidity were reporting the 
missing value (-9999).
Measurements:nsamettwr4hC1.b1:
  • Standard Deviation of 2m Vector Averaged Wind Direction(WD2M_SDU_WVT)
  • 2m Average Calculated Vapor Pressure(VP2M_AVG)
  • Standard Deviation of 2m Calculated Dew Point(DP2M_STD)
  • 2m Average Relative Humidity(RH2M_AVG)
  • Standard Deviation of 2m Relative Humidity(RH2M_STD)
  • 2m Average QLI Input Voltage(Volt2M_AVG)
  • 2m Vector Averaged Wind Speed(WS2M_U_WVT)
  • 2m Average Temperature(T2M_AVG)
  • Standard Deviation of 2m Calculated Vapor Pressure(VP2M_STD)
  • Standard Deviation of 2m Temperature(T2M_STD)
  • 2m Average QLI Reference Temperature(RefT2M_AVG)
  • 2m Average Calculated Dew Point(DP2M_AVG)
  • 2m Arithmetic Mean Wind Speed(WS2M_S_WVT)
  • 2m Vector Averaged Wind Direction(WD2M_DU_WVT)

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DQRID : D080612.1
Start DateStart TimeEnd DateEnd Time
05/14/2008150006/20/20081420
Subject:
NSA/METTWR/C1 - CMH required Calibration
DataStreams:nsamettwr4hC1.b1
Description:
The Chilled Mirror was showing some signs of being out of calibration.  Temperatures were 
at times higher than co-located temp probes and the dew point temperature values at times 
were not consistent with co-located RH sensors.
Measurements:nsamettwr4hC1.b1:
  • Chilled Mirror Calculated Vapor Pressure(VPCMH)
  • Chilled Mirror Calculated Relative Humidity(CMHRH)
  • Chilled Mirror Dew Point(CMHDP)
  • Chilled Mirror Temperature(CMHTemp)
  • Chilled Mirror Calculated Saturation Vapor Pressure(SatVPCMH)

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DQRID : D080623.1
Start DateStart TimeEnd DateEnd Time
04/06/2008220006/20/20080200
Subject:
NSA/MWR/C1 - Missing surface air temperature data
DataStreams:nsamwrlosC1.b1, nsamwrtipC1.a1
Description:
Some wires in the dewblower were not correctly configured.
Measurements:nsamwrlosC1.b1:
  • Ambient temperature(tkair)
nsamwrtipC1.a1:
  • Ambient temperature(tkair)

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DQRID : D080731.1
Start DateStart TimeEnd DateEnd Time
07/30/2008114108/03/20082359
Subject:
NSA/METTWR/C1 - 2m level data incorrect
DataStreams:nsamettwr4hC1.b1
Description:
The 2m data for temp, RH, dew point, wind speed wind direction & vapor pressure were 
incorrect.  The voltage values for the datalogger at that level were reporting as 60V with 
excursions to 100V.  These values should have damaged the logger at that level.  After an 
extended power outage on 08/04 the data all became reasonable. There is no explanation as 
to the cause of this failure.
Measurements:nsamettwr4hC1.b1:
  • Standard Deviation of 2m Vector Averaged Wind Direction(WD2M_SDU_WVT)
  • 2m Average Calculated Vapor Pressure(VP2M_AVG)
  • Standard Deviation of 2m Calculated Dew Point(DP2M_STD)
  • 2m Average Relative Humidity(RH2M_AVG)
  • Standard Deviation of 2m Relative Humidity(RH2M_STD)
  • 2m Average QLI Input Voltage(Volt2M_AVG)
  • 2m Vector Averaged Wind Speed(WS2M_U_WVT)
  • 2m Average Temperature(T2M_AVG)
  • Standard Deviation of 2m Calculated Vapor Pressure(VP2M_STD)
  • Standard Deviation of 2m Temperature(T2M_STD)
  • 2m Average QLI Reference Temperature(RefT2M_AVG)
  • 2m Average Calculated Dew Point(DP2M_AVG)
  • 2m Arithmetic Mean Wind Speed(WS2M_S_WVT)
  • 2m Vector Averaged Wind Direction(WD2M_DU_WVT)

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