DQRID : D080116.2
Start DateStart TimeEnd DateEnd Time
12/19/2007000012/31/20070000
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Subject:
FKB/MWRP/M1 - Periodic decrease in the 30-GHz brightness temperature
DataStreams:fkbmwrpM1.b1
Description:
Starting around 12/19 until the end of December, the 30-GHz brightness temperature started 
to show a periodic oscillation between 9 and 11 AM GMT. The cause of this is probably 
thermal instability of the radiometer since it does correspond with some larger 
oscillations of the mixer temperature. During this time external temperatures displayed large 
variations going from -10 C at night to about +5 C during the day. The corresponding liquid 
water path retrievals are affected showing periodic negative values.

Liquid water path retrievals between 12/19 and 12/31 are the most affected variable since 
they are largely affected by the 30-GHz channel. A time series plot of the data will 
clearly show the periodic fluctuation of the LWP variable.
Suggestions: 
Data should be disregarded or carefully assesses before use.
Measurements:fkbmwrpM1.b1:
  • Retrieved liquid water path using only 23.835 and 30.0 GHz(liquidWaterPath2)
  • Retrieved cloud liquid water content(liquidWaterContent)
  • Microwave brightness temperature(brightnessTemperature)
  • Retrieved liquid water path(liquidWaterPath)
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