Data Quality Reports for Session: 109043 User: mather Completed: 11/27/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D031215.3TWP/SMET/C1 - Tower Lowered for Cal Activitiestwpsmet60sC1.b1, twpsmetC1.00
D040428.1TWP/SMET/C1 - Poor Performing Sensortwpsmet60sC1.b1
D040824.3TWP/SMET/C1 - Incorrect rainrate equation usedtwpsmet60sC1.b1
D050421.6TWP/SMET/C1 - Negative rainfall ratestwpsmet60sC1.b1
D060817.3TWP/SMET/C1 - Reprocess: Barometric Data Changed from hPa to kPatwpsmet60sC1.b1
D061011.2TWP/SMET/C1 - Reprocess: Tipping bucket rain gauge addedtwpsmet60sC1.b1


DQRID : D031215.3
Start DateStart TimeEnd DateEnd Time
12/01/2003230012/02/20030300
Subject:
TWP/SMET/C1 - Tower Lowered for Cal Activities
DataStreams:twpsmet60sC1.b1, twpsmetC1.00
Description:
Tower lowered for instrument calibration
Measurements:twpsmet60sC1.b1:
  • Wind #1 speed standard deviation(wind1_spd_sd)
  • Vapor pressure mean(vappress_mean)
  • Wind #1 speed arithmetic average(wind1_spd_arith_avg)
  • Wind #2 speed vector average(wind2_spd_vec_avg)
  • Wind #2 speed minimum(wind2_spd_min)
  • Precipitation standard deviation(precip_sd)
  • Wind #2 speed standard deviation(wind2_spd_sd)
  • Wind #1 direction vector average(wind1_dir_vec_avg)
  • Wind #2 speed maximum gust(wind2_spd_max_gust)
  • Std Dev of Relative Humidity or Hardware Error Code(relh_sd)
  • Wind #2 speed maximum(wind2_spd_max)
  • Temperature maximum(temp_max)
  • Precipitation mean(precip_mean)
  • Relative humidity minimum(relh_min)
  • Wind #1 speed maximum(wind1_spd_max)
  • Vapor pressure standard deviation(vappress_sd)
  • Mean Air Temperature or Hardware Error(temp_mean)
  • Mean Relative Humidity(relh_mean)
  • Std Dev of Air Temperature(temp_sd)
  • precipitation minimum(precip_min)
  • Relative humidity maximum(relh_max)
  • Wind #1 speed maximum gust(wind1_spd_max_gust)
  • Wind #1 direction standard deviation(wind1_dir_sd)
  • Wind #2 speed arithmetic average(wind2_spd_arith_avg)
  • Precipitation maximum(precip_max)
  • Temperature minimum(temp_min)
  • Wind #2 direction standard deviation(wind2_dir_sd)
  • Wind #2 direction vector average(wind2_dir_vec_avg)
  • Wind #1 speed minimum(wind1_spd_min)
  • Wind #1 speed vector average(wind1_spd_vec_avg)

twpsmetC1.00:
  • Raw data stream - documentation not supported(Raw data stream - documentation not supported)


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DQRID : D040428.1
Start DateStart TimeEnd DateEnd Time
04/23/2004000001/19/20051530
Subject:
TWP/SMET/C1 - Poor Performing Sensor
DataStreams:twpsmet60sC1.b1
Description:
On 4/23/2004 condensation was found inside the target area of the ORG lens. A spare was 
sent and installed but did not solve the problem of high background voltage values causing 
rainrate values to be recorded during no rainfall.  Values range anywhere from 0.06 to 
0.12 mm/hr.  

A new Optical Rain Gage was installed on 01/19/2005 @ 13:30 GMT alleviating the high 
background voltage values that lead to consistent rainfall rates of around 0.11 to 0.15 mm/hr 
on a consistent basis.  

The formula used to calculate rainfall rates from the new Optical Rain Gage is:  RR 
(mm/hr) = 25(V^1.87) - 0.15.

Older model formula = 20(V^2) - 0.05

The two formulas result in comparable data.
Measurements:twpsmet60sC1.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


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DQRID : D040824.3
Start DateStart TimeEnd DateEnd Time
08/03/2004030708/17/20042138
Subject:
TWP/SMET/C1 - Incorrect rainrate equation used
DataStreams:twpsmet60sC1.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:twpsmet60sC1.b1:
  • Precipitation mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


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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 mean(precip_mean)
  • Precipitation maximum(precip_max)
  • Precipitation standard deviation(precip_sd)
  • precipitation minimum(precip_min)


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DQRID : D060817.3
Start DateStart TimeEnd DateEnd Time
10/09/1996000007/13/20062225
Subject:
TWP/SMET/C1 - Reprocess: Barometric Data Changed from hPa to kPa
DataStreams:twpsmet60sC1.b1
Description:
Barometric pressure data was converted from hPa to kPa in order 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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