Data Quality Reports for Session: 104161 User: deslover Completed: 02/12/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D050614.1SGP/VCEIL/C1 - poor signalsgpvceil25kC1.b1
D060208.2SGP/SONDE/C1 - Mixed use of RS92-SGP and RS92-KL radiosondessgpsondewnpnC1.b1
D060227.2SGP/SONDE/C1 - Soundings done as part of dual-sonde flightssgpsondewnpnC1.b1
D060928.3SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdrysgpsondewnpnC1.b1


DQRID : D050614.1
Start DateStart TimeEnd DateEnd Time
05/05/2005184204/19/20061713
Subject:
SGP/VCEIL/C1 - poor signal
DataStreams:sgpvceil25kC1.b1
Description:
When parameters were changed (set noise_h2_compensation to "ON" and units to "METERS") to 
correct a low amplitude problem, the backscatter plots began displaying horizontal 
stripes indicating detector "ringing". However, the cloud base heights are not affected. The 
problem was corrected when the instrument was replaced.
Measurements:sgpvceil25kC1.b1:
  • Detection status. See details(detection_status)
  • Aerosol volume backscattering coefficient at 355 nm(backscatter)


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DQRID : D060208.2
Start DateStart TimeEnd DateEnd Time
02/10/2006000012/31/20062359
Subject:
SGP/SONDE/C1 - Mixed use of RS92-SGP and RS92-KL radiosondes
DataStreams:sgpsondewnpnC1.b1
Description:
Because of a manufacturer's production problem, we will be using both RS92-SGP (GPS 
windfinding and RS92-KL (Loran windfinding) radiosondes at the SGP/CF starting February 10, 
2006.  The radiosonde type used for the each sounding may be determined by looking the 
metadata variable "launch_status" in the netCDF data files.
Measurements:sgpsondewnpnC1.b1:
  • east longitude for all the input platforms.(lon)
  • model zonal wind velocity(u_wind)
  • surface wind speed(wspd)
  • model meridional wind velocity(v_wind)
  • north latitude for all the input platforms.(lat)
  • Wind Direction(deg)
  • Wind Status(wstat)


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DQRID : D060227.2
Start DateStart TimeEnd DateEnd Time
02/22/2006000002/27/20060000
Subject:
SGP/SONDE/C1 - Soundings done as part of dual-sonde flights
DataStreams:sgpsondewnpnC1.b1
Description:
The following soundings done during the subject time period were flown in dual-sonde mode 
in which the standard ARM RS92 radiosonde was attached to the same balloon with a NASA 
ATR (atmospheric temperature reference) radiosonde.  The radiosondes were separated by a 6' 
styrofoam bar.  To accommodate the additional weight, we used 1200g balloons rather than 
350g balloons.  Accordingly, we want to alert users that these soundings may reach 
higher altitudes than normal for ARM soundings and that the ascent rate may be somewhat 
higher.  The following soundings are affected:

Sequence  Date    UTC launch time
    1     2/22        0530
    2     2/22        1730
    3     2/22        2330 <---- No data: launch failure    
    4     2/23        0230
    5     2/23        0530
    6     2/23        1730    
    7     2/23        2030
    8     2/23        2330
    9     2/24        2330
   10     2/25        0215
   11     2/25        0509    
   12     2/25        1730
   13     2/25        1930
   14     2/25        2300
Measurements:sgpsondewnpnC1.b1:
  • Surface dew point temperature(dp)
  • Time offset from base_time(base_time)
  • surface wind speed(wspd)
  • model zonal wind velocity(u_wind)
  • Relative humidity scaled, by total column amount from MWR(rh)
  • north latitude for all the input platforms.(lat)
  • Ascent Rate(asc)
  • pressure at constant pressure surface(pres)
  • Wind Direction(deg)
  • Wind Status(wstat)
  • east longitude for all the input platforms.(lon)
  • Dry-Bulb Temperature(tdry)
  • Time offset of tweaks from base_time(time_offset)
  • model meridional wind velocity(v_wind)
  • altitude above sea levelaltunits(alt)


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DQRID : D060928.3
Start DateStart TimeEnd DateEnd Time
09/28/2006172812/31/99992359
Subject:
SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry
DataStreams:sgpsondewnpnC1.b1
Description:
The output precision of the following variables was increased 20060928

alt  changed from 1m to 0.1m
dp   changed from 0.1degC to 0.01degC
pres changed from 0.1 hPa to 0.01 hPa
RH   changed from 1%RH to 0.01%RH
tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase in accuracy.  
Users are cautioned to continue to use their best scientific judgement when using these or 
any other data.
Measurements:sgpsondewnpnC1.b1:
  • Surface dew point temperature(dp)
  • Dry-Bulb Temperature(tdry)
  • Relative humidity scaled, by total column amount from MWR(rh)
  • pressure at constant pressure surface(pres)
  • altitude above sea levelaltunits(alt)


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