雪水当量是气候模型与大尺度水文模型中的一个重要参数。积雪容量对全球气候变化研究、大尺度径流估算与水资源管理等方面都有很重要的意义。因此研究积雪辐射模型模拟特征及模型验证显得极为重要。本文选用的积雪辐射模型是采用考虑多次散射的双矩阵法（Matrix Doubling Formulation）作为求解辐射传输方程的方法，利用致密介质理论来考虑积雪的近场效应，辐射传输方程的边界条件和下垫面辐射计算则采用高级积分方程模型（AIEM）。文中首先分析了辐射模型对下垫面参数特性和积雪颗粒特性的敏感性，结果表明下垫面特性和积雪颗粒大小对当前人们采用的温度梯度雪水当量反演算法有着很大影响。另外，本文利用瑞士Weissfluhjoch试验区的地面实验数据，对该积雪辐射模型在宽波段高频率和大角度的辐射信号模拟能力做了验证，验证结果表明该模型模拟值与地面实测数据吻合很好，说明积雪辐射模型能很好模拟自然地表的积雪辐射信号。

Snow is a key element in themeteorological and hydrological studies. The amountof regional snow\nplays an mi portant role in the clmi ate change and also affects themanagementofwater resources, and estmi ate\nthe runoffand flood forecasting. Thus, it isnecessary to do sensitivity analysisofdry snow emissionmode,l and\ncompare thismodelwith expermi ental data. In this study, firstly, we carried out the numerical smi ulations to\nevaluate the subsurface effects, including surface roughness and dielectric properties, on the brightness\ntemperature differences of snow covered terrain atAMSR-E frequencies. We found that the ground dielectric\nconstant and the surface roughness parameters such as RMS height and correlation length have a significant\neffecton the brightness temperature differences atAMSR-E frequencies. Then we evaluate the capability of a\nmulti-scatteringmicrowave emission model that includes the DenseMedia Radiative TransferModel(DMRT)\nandAIEM in smi ulation ofdry snow emissionwithMatrixDoubling approach. We compared the predictions of thismodelwith the ground expermi entalmeasurements on Dec. 21, 1995 atWeissfluhjoch (46°49, 83′N,\n9°48, 62′E) in Davos, Switzerland. The comparison showed that our snowmicrowave emissionmodel agreed\nwellwith the expermi entalmeasurements.