183-GHz Radiometer Handbook - November 2006

Cadeddu, M. P.

Argonne National Laboratory

关键词: Usa;    Water Vapor;    Manuals;    Brightness;    Radiometers;   

DOI  :  10.2172/948527
RP-ID  :  DOE/SC-ARM/TR-076
RP-ID  :  DE-AC02-06CH11357
RP-ID  :  948527

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来源: UNT Digital Library

【 摘 要 】

The G-Band Vapor Radiometer (GVR) provides time-series measurements of brightness temperatures from four double sideband channels centered at ± 1, ± 3, ± 7, and ± 14 GHz around the 183.31-GHz water vapor line. Atmospheric emission in this spectral region is primarily due to water vapor, with some influence from liquid water. The 183.31 ± 14-GHz channel is particularly sensitive to the presence of liquid water. The sensitivity to water vapor of the 183.31-GHz line is approximately 30 times higher than at the frequencies of the two-channel microwave radiometer (MWR) for a precipitable water vapor (PWV) amount of less than 2.5 mm. Measurements from this nstrument are therefore especially useful during low-humidity conditions (PWV < 5 mm).