Data Quality Reports for Session: 118010 User: yan Completed: 03/06/2009

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D070803.1TWP/SMET/C3 - Upper wind speed artificially slowtwpsmet60sC3.b1
D071105.1TWP/SMET/C3 - ORG overestimated rainfalltwpsmet60sC3.b1
D080225.1TWP/SMET/C3 - Upper Wind Sensor Data Questionabletwpsmet60sC3.b1
D081022.8TWP/SMET/C3 - Wind Speed data contain offset due to induced voltagetwpsmet60sC3.b1


DQRID : D070803.1
Start DateStart TimeEnd DateEnd Time
07/01/2007000009/18/20072315
Subject:
TWP/SMET/C3 - Upper wind speed artificially slow
DataStreams:twpsmet60sC3.b1
Description:
The upper wind measurement was consistently slower by around 0.5 - 1 m/s than the lower 
wind measurement.  The bearings on the upper wind measurement were binding.
Measurements:twpsmet60sC3.b1:
  • Upper sensor, wind speed maximum(up_spd_max)
  • Upper sensor, wind speed arithmetic average(up_spd_arith_avg)
  • Upper sensor, wind speed minimum(up_spd_min)
  • Upper sensor, wind speed vector average(up_spd_vec_avg)
  • Upper sensor, wind speed standard deviation(up_spd_sd)

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DQRID : D071105.1
Start DateStart TimeEnd DateEnd Time
11/02/2007185511/02/20072010
Subject:
TWP/SMET/C3 - ORG overestimated rainfall
DataStreams:twpsmet60sC3.b1
Description:
Optical rain gauge (ORG) measured approximately 10mm higher than two co-located tipping 
bucket rain gauges and a co-located disdrometer.  The ORG is typically higher but usually 
not by an order of magnitude.
Measurements:twpsmet60sC3.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)

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DQRID : D080225.1
Start DateStart TimeEnd DateEnd Time
01/05/2008000002/27/20080315
Subject:
TWP/SMET/C3 - Upper Wind Sensor Data Questionable
DataStreams:twpsmet60sC3.b1
Description:
The wind_up vs. wind_low wind directions diverged, with the differences between the two 
eventually reached 45 degrees. The Upper sensor was found to be mis-aligned and loose.
Measurements:twpsmet60sC3.b1:
  • Upper sensor, wind speed maximum(up_spd_max)
  • Upper sensor, wind speed arithmetic average(up_spd_arith_avg)
  • Upper sensor, wind speed minimum(up_spd_min)
  • Upper sensor, wind speed vector average(up_spd_vec_avg)
  • Upper sensor, wind speed standard deviation(up_spd_sd)

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DQRID : D081022.8
Start DateStart TimeEnd DateEnd Time
03/12/2004000010/17/20080627
Subject:
TWP/SMET/C3 - Wind Speed data contain offset due to induced voltage
DataStreams:twpsmet60sC3.b1
Description:
The marine model of the RM Young wind sensor needs twisted pair shielded cable.  The 
manufacturer did not originally supply the pigtail with twisted pair shielded cable.  Use of 
twisted pair shielded cable for the rest of the cable run to the logger was also not 
specified.  This caused an induced voltage in the wind speed line from the wind direction 
excitation.  The induced voltage varied from sensor to sensor and probably changed anytime 
the cable was replaced or parts of the wind sensor were repaired or replaced. The induced 
voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s.
Measurements:twpsmet60sC3.b1:
  • Upper sensor, wind speed maximum(up_spd_max)
  • Lower sensor, wind speed minimum(lo_spd_min)
  • Lower sensor, wind speed standard deviation(lo_spd_sd)
  • Lower sensor, wind speed maximum(lo_spd_max)
  • Upper sensor, wind speed arithmetic average(up_spd_arith_avg)
  • Lower sensor, wind speed vector average(lo_spd_vec_avg)
  • Upper sensor, wind speed minimum(up_spd_min)
  • Lower sensor, wind speed arithmetic average(lo_spd_arith_avg)
  • Upper sensor, wind speed vector average(up_spd_vec_avg)
  • Upper sensor, wind speed standard deviation(up_spd_sd)

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