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积雪雪水当量参数是水文、气候、水资源利用与管理模型中非常重要的输入参数,积雪辐射理论模型可以模拟积雪物理参数与微波辐射的关系.因此,准确模拟积雪辐射信息,验证积雪辐射模型显得尤为重要.采用改进的基于能量守恒的干雪微波辐射传输理论模型(DMRT-AIEM-MD),利用2008年3月24日黑河地区联合实验获取的地面测量数据以及车载辐射计18.7 GHz和36.5 GHz两个频率的辐射亮温值,考虑地形的影响,分析积雪辐射散射特性以及验证该模型.结果表明:该模型模拟值与地面实测值吻合的比较好,该模型能较好的模拟中国地区自然地表积雪辐射信号.分析了部分模型模拟值和地面实测值偏差的可能原因,该积雪区是多次堆积形成,积雪垂直剖面的密度、温度不规则变化可能会引起偏差.
Snow and snow equivalent parameters are very important input parameters in the hydrology, climate and water resources utilization and management models. The snow radiation theory model can simulate the relationship between snow cover physical parameters and microwave radiation. Therefore, It is very important to validate the snow radiation model.Using improved DMRT-AIEM-MD model based on energy conservation and dry-snow microwave radiation transmission, using the measured data from the joint experiment in Heihe district on March 24, 2008, Considering the influence of terrain, the scattering characteristics of snow radiation were analyzed and the model was validated.The results show that the simulated value of this model is in good agreement with the measured value of the ground, Which is a good simulation of natural surface snow radiation signals in China.It is analyzed that the possible causes of partial model simulation value and ground measured value deviation are multiple accumulation formation.The density and temperature of snow vertical profile may change irregularly Will cause bias.