SGP/MWR/B1 - 23.8-GHz brightness temperature slightly high

The radiometer was refurbished and tested at the central facility in 2007. During testing 
the 23.8-GHz brightness temperature was found to be about 1.5 K higher than the 
measurements of the C1 radiometer. 

On 6/19/07 the radiometer was installed at BF1. A comparison with model calculation showed 
that the measured 23.8-GHz brightness temperature is slightly higher than the model. 
This offset will affect the PWV retrieval that is on an average about 1.3 mm higher than the 
radiosonde measurements. The rms error of the retrieved PWV is about 1 mm higher than 
specified in the netcdf file.

On 10/16/2009 the radiometer was removed because of shut down of the boundary facility.

• vaptip
• tbskytip23

• Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
• Total water vapor along LOS path(vap)
• 23tbsky

• Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
• Total water vapor along LOS path(vap)

SGP/MWR/B1 - Increased noise level

The radiometer was experiencing intermittent increase in the noise level of the two 
channels. Although it looks like the radiometer was still able to calibrate, the increased 
noise level may have resulted in a reduced number of tip curves collected. The increased 
noise was intermittent and lasted for a few hours at a time.

• vaptip
• tbskytip31
• liqtip
• tbskytip23

• Total liquid water along LOS path(liq)
• Radiation, longwave, brightness temperature, 23.8 GHz(tbsky23)
• Total water vapor along LOS path(vap)
• 31.4 GHz sky brightness temperature(tbsky31)