Data Quality Reports for Session: 139977 User: kjohnson Completed: 01/23/2012


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D080428.2TWP/SMET/C1 - Reprocess: ORG Data has very small rainrate valuestwpsmet60sC1.b1
D080707.2TWP/SMET/C1 - ORG Precip Data Incorrecttwpsmet60sC1.b1
D081022.3TWP/SMET/C1 - Wind Speed data contain offset due to induced voltagetwpsmet60sC1.b1
D100215.4TWP/VCEIL/C1 - Reprocess: Incorrect serial_number and sum_backscatter fieldstwpvceil25kC1.b1


DQRID : D080428.2
Start DateStart TimeEnd DateEnd Time
08/01/2004000006/30/20102359
Subject:
TWP/SMET/C1 - Reprocess: ORG Data has very small rainrate values
DataStreams:twpsmet60sC1.b1
Description:
The ORG data is collected via analog signal and not digital.  Therefore, we continuously 
collect data even when no rain is occurring.  We also capture small events such as leaves, 
large bugs, dust, etc blowing through the measurement path.  Because this discrete event 
occurs quickly the value is usually captured for 1 or 2 seconds.  This value is then 
averaged to the minute producing rainrate on the order of .009 mm/hr or less.  These values 
are not indicative of rain and should be removed from the record or summing over long 
periods can bias the climate record.  We are reprocessing the data to remove these small 
values and are adjusting the collection program to remove them before ingest.
Measurements:twpsmet60sC1.b1:
  • Precipitation minimum(precip_min)
  • Precipitation maximum(precip_max)
  • precip_sd
  • Precipitation mean(precip_mean)


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DQRID : D080707.2
Start DateStart TimeEnd DateEnd Time
02/07/2008130002/09/20080600
Subject:
TWP/SMET/C1 - ORG Precip Data Incorrect
DataStreams:twpsmet60sC1.b1
Description:
Moisture intrusion into the sensor body allowed condensation on the lens of the ORG.  
Continual and long-term precipitation was reported during this time.
Measurements:twpsmet60sC1.b1:
  • Precipitation minimum(precip_min)
  • Precipitation maximum(precip_max)
  • precip_sd
  • Precipitation mean(precip_mean)


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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:
  • lo_spd_max
  • lo_spd_vec_avg
  • up_spd_max
  • lo_spd_arith_avg
  • lo_spd_min
  • up_spd_sd
  • up_spd_arith_avg
  • up_spd_vec_avg
  • up_spd_min
  • lo_spd_sd


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DQRID : D100215.4
Start DateStart TimeEnd DateEnd Time
10/11/1996000010/31/20092359
Subject:
TWP/VCEIL/C1 - Reprocess: Incorrect serial_number and sum_backscatter fields
DataStreams:twpvceil25kC1.b1
Description:
Attribute serial_number: In most cases, this field is not representative of the actual 
serial number of the instrument because the value did not change when an instrument changed 
locations or was replaced with a spare.
   
Variable sum_backscatter: An out-of-range condition for the "sum of detected and 
normalized backscatter" was reported as 0 instead of missing (-9999). The valid range is 0 - 
0.0999 /srad.
   
This DQR also applies to a1 level data.
Measurements:twpvceil25kC1.b1:
  • sum_backscatter


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