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G-band (183 GHz) Vapor Radiometer (GVR)

Instrument Categories: Radiometric

General Overview

Picture of the G-band (183 GHz) Vapor Radiometer (GVR)

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 instrument are, therefore, especially useful during low-humidity conditions (PWV < 5 mm).

Primary Measurements Taken

The following measurements are those considered scientifically relevant. Refer to the netCDF File Header Descriptions (Data Object Design Files) for the list of all available measurements, including those recorded for diagnostic or quality assurance purposes.

Available Datastreams

Sites / Facilities

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Mentor(s)

Maria Cadeddu
(630) 252-7408
mcadeddu@anl.gov