DQRID : D130118.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
11/04/2005000003/31/20062359Suspect
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Subject:
TWP/MICROBASE/C3  - Incorrect detection of precipitation
DataStreams:twpmicrobasepi2C3.c1
Description:
Microbase uses the CloudBasePrecipitation field from twparscl1clothC3.c1 to determine the 
occurrence of precipitation.  As noted in DQR D061220.35 for twparscl1clothC3.c1, the 
CloudBasePrecipitation is incorrect over this period due to a processing issue.  As a 
result, the values in the Microbase aqc_precip field are incorrect.  In addition, values of 
"14" to indicate precipitation in the Microbase aqc_liquid_water_content and 
aqc_liq_effective_radius fields are incorrect and should be ignored.  Because we don't know when 
precipitation occurred, values of liquid_water_content and liq_effective_radius are suspect over 
this period.
Suggestions: 
Use the precip_mean field from the twpsmet60sC3.b1 to determine if precipitation 

occurred. If precipitation has not occurred the values of liquid_water_content and 
liq_effective-radius are good.  
Note: Use these met data with caution from 12/01/2005-3/31/2006 as there was a grounding issue with the optical rain gauge over this period.  You may need to subtract a background value of up to 0.10 mm/hr from the precip_mean values. Please see DQR D060426.8 for more details on this issue.  
Use the precip_mean field from the twpsmet60sC3.b1 to determine if precipitatio
n 
occurred. If precipitation has not occurred the values of liquid_water_content and 
liq_effective-radius are good.  
Note: Use these met data with caution from 12/01/2005-3/31/2006 
as there was a grounding issue with the optical rain gauge over this period.  You may need to subtract a background value of up to 0.10 mm/hr from the precip_mean values. Please see DQR D060426.8 for more details on this issue.
Measurements:twpmicrobasepi2C3.c1:
  • liquid_water_content
  • liq_effective_radius
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