反演寿县TMI微波频率的地表比辐射率

摘要

利用一个微波辐射传输模式,晴天下的大气探测廓线,地面的部分观测资料以及卫星观测的亮温,计算了淮河流域能量和水循环实验(HUBEX)中,寿县地区的热带降雨观测卫星微波成像仪(TRMM/TMI)微波频率的地表比辐射率.通过比较所计算的微波地表比辐射率随地表状况的改变,发现地表微波比辐射率随地表状况的变化存在敏感性,并且其变化是合理的.本文中,地表肤温设定等于地表空气温度,并且仅计算了寿县的地表比辐射率,在HUBEX区域上的地表比辐射率的计算需要更多的观测资料.%Using a microwave radiative transfer model, atmospheric sounding profiles, satellite brightness temperatures, and some surface observed measurements under cloud-free conditions, surface emissivities at the frequencies of TRMM/TMI (Tropical Rainfall Measuring Mission Microwave Imager) at Shouxian in HUBEX (Huaihe River Basin Energy and Water Cycle Experiment) are retrieved. Compared to the microwave surface emissivities with changing conditions of the surface, it is found that the microwave emissivities have some sensitive variability with the conditions of the surface, and the variability is reasonable. In the calculation, the surface air temperatures are assumed to equal the surface skin temperatures, and only the emissivity at Shouxian is calculated; the calculation of the emissivities over the region of HUBEX needs more measurements.