G-band (183 GHz) Vapor Radiometer profiler: 15 microwave brightness temperatures from 170.0 to 183.3 GHz - gvrp

The G-band vapor radiometer profiler (GVRP) provides time-series measurements of brightness temperatures from 15 channels between 170 and 183.31 GHz. Atmospheric emission in this spectral region is primarily due to water vapor, with some influence from liquid water. The wing channels between 170 and 175 GHz have sensitivity 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 especially useful during low-humidity conditions (PWV < 5 mm).

G波段水汽辐射计廓线仪（G-band vapor radiometer profiler, GVRP）可提供15个通道在170至183.31吉赫频段内的亮温时间序列观测数据。该光谱区域的大气辐射主要源于水汽，同时受液态水的部分影响。170至175吉赫之间的旁频通道对液态水的存在具有敏感性。当可降水量（precipitable water vapor, PWV）低于2.5毫米时，183.31吉赫谱线对水汽的敏感度约为双通道微波辐射计（two-channel microwave radiometer, MWR）的30倍。该仪器的观测数据在低湿度条件下（PWV＜5毫米）尤为实用。