DQRID : D020805.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
04/01/2002000008/02/20021652Suspect
more
Subject:
SGP/MWR/B6 - High noise level, poor calibration
DataStreams:sgpmwrlosB6.a0, sgpmwrlosB6.b1, sgpmwrlosB6.a1
Description:
The data from this instrument (serial number 18) have become increasingly noisy, most 
likely due to a failing local oscillator.  A consequence of this increased noise level has 
been few valid calibration scans ("tip curves") since 1 April 2002: during the period 26-31 
March 2002 1496 valid tip curves were acquired, whereas only 729 were acquired during 
April, 387 during May, 143 during June, 243 during July.  As a result, the calibration was 
not as well-maintained as usual.  The measured brightness temperatures and retrieved 
precipitable water vapor and liquid water path should be regarded as suspect.  The instrument 
was replaced with serial number 04 on 2 August 2002.
Suggestions: 
The noise and suspect calibration are not correctable.  Use of these data should be 

avoided.
Measurements:sgpmwrlosB6.a0:
  • 23bb
  • 23tbsky
  • 31tbsky
  • 31unoise
  • 31bbn
  • liq
  • 31sky
  • sky23
  • temperature_correction_coef_23
  • tbsky23
  • tnd23
  • 23skyn
  • bbn23
  • temperature_correction_coef_31
  • vap
  • 23sky
  • 23unoise
  • noise_injection_temp_31
  • 23bbn
  • bbn31
  • tnd31
  • bb31
  • noise_injection_temp_23
  • 31bb
  • 31skyn
  • bb23
  • tbsky31
  • sky31
more
sgpmwrlosB6.b1:
  • bbn23
  • sky31
  • tc31
  • tnd23
  • vap
  • bb31
  • sky23
  • bbn31
  • tnd31
  • tnd_nom23
  • tnd_nom31
  • tbsky31
  • liq
  • tbsky23
  • bb23
  • tc23
more
sgpmwrlosB6.a1:
  • liq
  • tc23
  • bbn23
  • sky31
  • bb23
  • tnd23
  • vap
  • tbsky31
  • 31tbsky
  • tbsky23
  • tnd_nom31
  • tc31
  • bb31
  • sky23
  • tnd31
  • 23tbsky
  • bbn31
  • tnd_nom23
more

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