Data Quality Reports for Session: 121206 User: sbenson Completed: 08/03/2009


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060426.8TWP/SMET/C3 - ORG data noisy due to degraded groundtwpsmet60sC3.b1
D061011.4TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge addedtwpsmet60sC3.b1
D081022.8TWP/SMET/C3 - Wind Speed data contain offset due to induced voltagetwpsmet60sC3.b1
D090515.1TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degreestwpsmet60sC3.b1


DQRID : D060426.8
Start DateStart TimeEnd DateEnd Time
12/01/2005000008/24/20062359
Subject:
TWP/SMET/C3 - ORG data noisy due to degraded ground
DataStreams:twpsmet60sC3.b1
Description:
SMET Rain Data began to be noisy during December 2005 and the problem slowly became worse 
over time so that in February 2006 the ORG was reporting with a constant background value 
of around 0.10 mm/hr rain rate.  ORG voltage showed a near constant value above the 85mV 
threshold.  The ground for the ORG had become degraded and was lost due to corrosion.
Measurements:twpsmet60sC3.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


Back To Table of Contents

DQRID : D061011.4
Start DateStart TimeEnd DateEnd Time
03/12/2002000009/26/20061435
Subject:
TWP/SMET/C3 - Reprocess: Tipping bucket rain gauge added
DataStreams:twpsmet60sC3.b1
Description:
A tipping bucket rain gauge was added to the SMET suite of instruments effective 20060926. 
 Two new variables (count and rain amount) were added at the end of the twpsmet60sC1.b1 
datastream.  When reprocessing of this datastream occurs these variables will be added 
with -9999 (missing) as the value for dates prior to gauge installation.
Measurements:twpsmet60sC3.b1:
  • base time(base_time)


Back To Table of Contents

DQRID : D081022.8
Start DateStart TimeEnd DateEnd Time
03/12/2002000010/17/20080627
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)


Back To Table of Contents

DQRID : D090515.1
Start DateStart TimeEnd DateEnd Time
04/19/2005042004/04/20090115
Subject:
TWP/SMET/C3 - Reprocess: Temperature Biased low by 1.06 Degrees
DataStreams:twpsmet60sC3.b1
Description:
The temperature of the SMET system was biased low by 1.06 Deg C due to a non-precision 
resistor being used int he measurement circuit.  The data will be reprocessed.  Saturation 
Vapor pressure and Vapor pressure will have to be reprocessed also.

Add 1.06 degrees to the temperature data.  

Correct Sat Vap Press using the Buck approximation:
   Es = 6.1121exp((17.502*T)/(240.97 + T) 
where T is the temperature in C.  

Correct Vapor pressure using: E = (RH*Es)/100
Measurements:twpsmet60sC3.b1:
  • Vapor pressure standard deviation(vappress_sd)
  • Mean Air Temperature or Hardware Error(temp_mean)
  • Vapor pressure mean(vappress_mean)
  • Std Dev of Air Temperature(temp_sd)


Back To Table of Contents



END OF DATA