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 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 GVR is approximately 30 times more sensitive to water vapor than 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).G波段水汽辐射计（G-band vapor radiometer，GVR）可针对183.31GHz水汽谱线周边的4个双边带通道，获取亮温的时间序列测量值。此光谱区域的大气辐射主要由水汽产生，同时受液态水一定程度的影响。当可降水量水汽（precipitable water vapor，PWV）小于2.5mm时，GVR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。因此，该仪器的测量结果在低湿度环境（PWV＜5mm）下尤为实用。