Data Quality Reports for Session: 141417 User: lmladek771 Completed: 03/23/2012


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D061011.2TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge addedtwpsmet60sC1.b1
D080428.2TWP/SMET/C1 - Reprocess: ORG Data has very small rainrate valuestwpsmet60sC1.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
D120228.3TWP/MPLCMASK/C1 - Cloud layer information in the header is misleadingtwp30smplcmask1zwangC1.c1


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


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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 : 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
  • up_spd_max
  • lo_spd_vec_avg
  • lo_spd_min
  • lo_spd_arith_avg
  • up_spd_sd
  • up_spd_vec_avg
  • up_spd_arith_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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DQRID : D120228.3
Start DateStart TimeEnd DateEnd Time
08/10/1999000001/31/20072359
Subject:
TWP/MPLCMASK/C1 - Cloud layer information in the header is misleading
DataStreams:twp30smplcmask1zwangC1.c1
Description:
he comment in the header for cloud_base_layer indicates that the value of -1 indicates 
that no cloud is detected.  For the above time range, a value of 0 indicates that no cloud 
is detected.
Measurements:twp30smplcmask1zwangC1.c1:
  • cloud_base_layer


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