Data Quality Reports for Session: 128512 User: tami1toto Completed: 06/22/2010


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050421.6TWP/SMET/C1 - Negative rainfall ratestwpsmet60sC1.b1
D060817.3TWP/SMET/C1 - Reprocess: Barometric pressure units changetwpsmet60sC1.b1
D061011.2TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge addedtwpsmet60sC1.b1
D081022.3TWP/SMET/C1 - Wind Speed data contain offset due to induced voltagetwpsmet60sC1.b1


DQRID : D050421.6
Start DateStart TimeEnd DateEnd Time
10/09/1996000003/09/20042243
Subject:
TWP/SMET/C1 - Negative rainfall rates
DataStreams:twpsmet60sC1.b1
Description:
Due to limitations of the Zeno dataloggers all voltage measurements
from the optical rain gauge (ORG) were converted to rainfall rates. 
This resulted in negative values for rain rates.  Any value below 0.10 mm/hr should be 
considered to be 0 mm/hr.  New dataloggers 
alleviated this problem.  New loggers were installed 03/09/2004 @ 2243 GMT.
Measurements:twpsmet60sC1.b1:
  • precipitation minimum(precip_min)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • Precipitation mean(precip_mean)


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DQRID : D060817.3
Start DateStart TimeEnd DateEnd Time
10/09/1996000008/02/20041911
Subject:
TWP/SMET/C1 - Reprocess: Barometric pressure units change
DataStreams:twpsmet60sC1.b1
Description:
Barometric pressure data during this time period is reported in hPa.  After this time, the 
data have been converted to kPa to standardize the measurement units among ARM sites and 
to conform to accepted standard units determined by the scientific community.
Measurements:twpsmet60sC1.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D061011.2
Start DateStart TimeEnd DateEnd Time
10/09/1996000010/17/20060000
Subject:
TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge added
DataStreams:twpsmet60sC1.b1
Description:
A tipping bucket rain gauge was added to the TWP.C1 SMET suite of instruments on 20061017. 
 Effective 20060926, two new variables (count and rain amount) were added to the end of 
the twpsmet60sC1.b1 datastream.  Between 9/26 and 10/17, the data for these two variables 
are filled with zeros.  Users should not use the data during this period as the zeros 
are not representative of the rain fall at the site.  When reprocessing of this datastream 
occurs these variables will be added for the 19961009-20060926 and data from 
19961009-20061017 will be filled with -9999 (missing).
Measurements:twpsmet60sC1.b1:
  • base time(base_time)


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DQRID : D081022.3
Start DateStart TimeEnd DateEnd Time
10/09/1996000011/03/20080730
Subject:
TWP/SMET/C1 - Wind Speed data contain offset due to induced voltage
DataStreams:twpsmet60sC1.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:twpsmet60sC1.b1:
  • Lower sensor, wind speed maximum(lo_spd_max)
  • Lower sensor, wind speed vector average(lo_spd_vec_avg)
  • Upper sensor, wind speed maximum(up_spd_max)
  • Lower sensor, wind speed arithmetic average(lo_spd_arith_avg)
  • Lower sensor, wind speed minimum(lo_spd_min)
  • Upper sensor, wind speed standard deviation(up_spd_sd)
  • Upper sensor, wind speed arithmetic average(up_spd_arith_avg)
  • Upper sensor, wind speed vector average(up_spd_vec_avg)
  • Upper sensor, wind speed minimum(up_spd_min)
  • Lower sensor, wind speed standard deviation(lo_spd_sd)


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