Data Quality Reports for Session: 140534 User: kboyd Completed: 02/10/2012

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D060208.2SGP/SONDE/C1 - Mixed use of RS92-SGP and RS92-KL radiosondessgpsondewnpnC1.b1
D060928.3SGP/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdrysgpsondewnpnC1.b1
D070314.2SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flagsgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1
D100729.1SGP/WACR/C1 - Reflectivity and Height OffsetssgpwacrC1.b1, sgpwacrspeccmaskcopolC1.a0, sgpwacrspeccmaskxpolC1.a0


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:
  • wstat
  • lon
  • Mean Wind Speed(wspd)
  • Wind Direction(deg)
  • Northward Wind Component(v_wind)
  • lat
  • Eastward Wind Component(u_wind)

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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:
  • alt
  • Dry Bulb Temperature(tdry)
  • Dewpoint Temperature(dp)
  • Humidity, relative(rh)
  • Pressure, atmospheric, constant value of model level, RUC model output(pres)

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DQRID : D070314.2
Start DateStart TimeEnd DateEnd Time
01/12/2007000001/15/20070000
Subject:
SGP/MWR/C1/E14 - Freezing rain-Incorrect rain flag
DataStreams:sgpmwrlosC1.b1, sgpmwrlosE14.b1, sgpmwrtipC1.a1, sgpmwrtipE14.a1
Description:
Between 01/12 and 01/15 brightness temperatures show high values (Tb > 100 K) indicative 
of rain, however the wet_window flag is 0 (indicative of no rain). During that time there 
where freezing conditions with ice pellets that were not detected by the sensor. The high 
brightness temperatures may be due to melting ice on the window.
Measurements:sgpmwrtipE14.a1:
  • wet_window
sgpmwrtipC1.a1:
  • wet_window
sgpmwrlosE14.b1:
  • wet_window
sgpmwrlosC1.b1:
  • wet_window

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DQRID : D100729.1
Start DateStart TimeEnd DateEnd Time
12/05/2005000009/23/20082359
Subject:
SGP/WACR/C1 -  Reflectivity and Height Offsets
DataStreams:sgpwacrC1.b1, sgpwacrspeccmaskcopolC1.a0, sgpwacrspeccmaskxpolC1.a0
Description:
The instrument vendor has informed us of a range (height) offset of 13 m and has provided 
an updated reflectivity calibration.  All values reported for 'Reflectivity' are 
approximately 3 dB too low.   In addition, the Reflectivity in the first and fourth range gates 
(starting from the surface) need to be further corrected by an additional 2.7 and -0.9 dB, 
respectively. The 'height' field values are 13.33 m too low.  The data will be 
reprocessed to correct these problems.

Update:  The sgpwacrC1.b1 data were reprocessed to correct the height and reflectivity 
offsets.  The corrected data were archived 20100910-20100915.
Measurements:sgpwacrspeccmaskcopolC1.a0:
  • Cloud, reflectivity, at altitude(Reflectivity)
  • heights
sgpwacrspeccmaskxpolC1.a0:
  • Cloud, reflectivity, at altitude(Reflectivity)
  • heights
sgpwacrC1.b1:
  • Cloud, reflectivity, at altitude(Reflectivity)
  • heights

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