DQRID : D100830.1
Start DateStart TimeEnd DateEnd Time
07/20/2010120008/09/20101400
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Subject:
GRW/MWR/M1 - Erratic brightness temperature
DataStreams:grwmwrlosM1.b1, grwmwrtipM1.a1
Description:
Around 12 Z on 7/20 both the PWV and 23.8 GHz brightness temp values began to diverge from 
those of the MWRP. By 7/22 both the LWP and 31.4 GHz brightness temp had followed suit. 
At 0600 Z on 7/22 multiple (10-20), brief (<=1 min) data outages began appearing hourly.  
The problem persisted intermittently until 8/9.

On 8/9, changes in the settings of the computer restored the proper functionality of the 
MWR software.
Suggestions: 
Use MWRP during specified period.
Measurements:grwmwrtipM1.a1:
  • Total liquid water along zenith path using tip-derived brightness temperatures(liqtip)
  • 31.4 GHz sky brightness temperature derived from tip curve(tbsky31tip)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Noise injection temp at 23.8 GHz derived from this tip(tnd23I)
  • Noise injection temp at 31.4 GHz derived from this tip(tnd31I)
  • 23.8 GHz sky brightness temperature derived from tip curve(tbsky23tip)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Total water vapor along zenith path using tip-derived brightness temperatures(vaptip)
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
more
grwmwrlosM1.b1:
  • Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
  • Mean 31.4 GHz sky brightness temperature(tbsky31)
  • Averaged total liquid water along LOS path(liq)
  • Mean 23.8 GHz sky brightness temperature(tbsky23)
  • Temperature correction coefficient at 31.4 GHz(tc31)
  • Temperature correction coefficient at 23.8 GHz(tc23)
  • Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
  • Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
  • Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
  • Total water vapor along LOS path(vap)
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