Estimation of Microwave Radiation Intensity from a Multilayered Cloud Model

摘要

A direct analysis for the estimation of brightness temperatures in realistic, multilayered cloud hydrometeor profiles over a range of microwave frequencies (6.6-183 GHz) is presented. The sensitivity of microwave radiative transfer through the atmosphere with respect to its constituents is investigated with a one-dimensional numerical model. The atmosphere is modeled as nongray, absorbing, emitting, and anisotropically scattering with nonisothermal, vertically stratified layers. The governing time-independent radiative heat transfer equation through the atmosphere is solved using a finite volume method. Results of homogeneous and inhomogeneous media, in the presence and absence of scattering constituents, are compared to those published earlier. In the absence of scattering constituents, the differences in the brightness temperature values between the present study and with those published earlier never exceeded 2 K, and the differences that are caused in the presence of scattering constituents are discussed.