Data Quality Reports for Session: 114311 User: wlj Completed: 09/22/2008


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D000613.3TWP/C2/SMET - Pressure sensitivity to raintwpsmet60sC2.a1, twpsmet60sC2.b1
D040722.7TWP/SMET/C2 - connection and timing issues with new loggertwpsmet60sC2.b1
D040726.1TWP/SMET/C2 - Negative rainfall ratestwpsmet60sC2.b1
D040824.2TWP/SMET/C2 - Incorrect rainrate equation used.twpsmet60sC2.b1
D050921.2TWP/SMET/C2 - ORG data incorrecttwpsmet60sC2.b1
D060818.2TWP/SMET/C2 - Reprocess: Barometric pressure units change twpsmet60sC2.b1
D061011.3TWP/SMET/C2 - Reprocess: Tipping bucket rain gauge addedtwpsmet60sC2.b1


DQRID : D000613.3
Start DateStart TimeEnd DateEnd Time
11/20/1998000012/31/19982359
Subject:
TWP/C2/SMET - Pressure sensitivity to rain
DataStreams:twpsmet60sC2.a1, twpsmet60sC2.b1
Description:
The pressure behaves anomalously during rain events - even very mild
ones.  Normally, the pressure undergoes a smooth semi-diurnal
oscillation with little higher frequency variability.  However, during
and shortly after rain events, the pressure signal exhibits abrupt
changes - this sort of behavior has occasionally been observed at
Manus but not with the regularity seen here.  Examples of this
behaviour occur on (date in the form YYYYMMDD):

19981212
19981215
19981216
19981217
19981223
19981224
19981225
19981230
19981231
Measurements:twpsmet60sC2.b1:
  • Barometric Pressure(atmos_pressure)
  • Vapor pressure standard deviation(vappress_sd)
  • Vapor pressure mean(vappress_mean)

twpsmet60sC2.a1:
  • Vapor pressure standard deviation(vappress_sd)
  • Vapor pressure mean(vappress_mean)
  • Barometric Pressure(atmos_pressure)


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DQRID : D040722.7
Start DateStart TimeEnd DateEnd Time
07/07/2004013807/07/20042018
Subject:
TWP/SMET/C2 - connection and timing issues with new logger
DataStreams:twpsmet60sC2.b1
Description:
Atmospheric pressure data are intermittent during this time period due to connection 
problems and program timing issues with new logger installation.  Data resumed normal 
operations after this time period.
Measurements:twpsmet60sC2.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D040726.1
Start DateStart TimeEnd DateEnd Time
10/21/1998031107/06/20040138
Subject:
TWP/SMET/C2 - Negative rainfall rates
DataStreams:twpsmet60sC2.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.
Measurements:twpsmet60sC2.b1:
  • Precipitation maximum(precip_max)
  • Precipitation mean(precip_mean)
  • precipitation minimum(precip_min)
  • Precipitation standard deviation(precip_sd)


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DQRID : D040824.2
Start DateStart TimeEnd DateEnd Time
07/07/2004013708/17/20042157
Subject:
TWP/SMET/C2 - Incorrect rainrate equation used.
DataStreams:twpsmet60sC2.b1
Description:
There are two different Optical Raingages in use at the TWP sites.  The incorrect equation 
was used at this site.  The incorrect equation is (25*(V^1.87)) - 0.15.
The correct equation is (20*(V^2)) - 0.05.  The correct equation was installed.
Measurements:twpsmet60sC2.b1:
  • Precipitation maximum(precip_max)
  • Precipitation mean(precip_mean)
  • precipitation minimum(precip_min)
  • Precipitation standard deviation(precip_sd)


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DQRID : D050921.2
Start DateStart TimeEnd DateEnd Time
09/19/2005080909/19/20051902
Subject:
TWP/SMET/C2 - ORG data incorrect
DataStreams:twpsmet60sC2.b1
Description:
Data from the ORG was incorrect due to heavy condensation on the lens.
Measurements:twpsmet60sC2.b1:
  • Precipitation maximum(precip_max)
  • Precipitation mean(precip_mean)
  • precipitation minimum(precip_min)
  • Precipitation standard deviation(precip_sd)


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DQRID : D060818.2
Start DateStart TimeEnd DateEnd Time
10/21/1998000007/06/20042359
Subject:
TWP/SMET/C2 - Reprocess: Barometric pressure units change
DataStreams:twpsmet60sC2.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:twpsmet60sC2.b1:
  • Barometric Pressure(atmos_pressure)


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DQRID : D061011.3
Start DateStart TimeEnd DateEnd Time
10/21/1998000011/29/20062014
Subject:
TWP/SMET/C2 - Reprocess: Tipping bucket rain gauge added
DataStreams:twpsmet60sC2.b1
Description:
A tipping bucket rain gauge was added to the TWP.C2 SMET suite of instruments on 20061129. 
Effective 20060926, two new variables (count and rain amount) were added to the end of 
the twpsmet60sC2.b1 datastream.  Between 9/26 and 11/29, 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 19981021-20060926 and data from 
19981021-20061129 will be filled with -9999 (missing).
Measurements:twpsmet60sC2.b1:
  • base time(base_time)


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