Evaluation of the Community Microwave Emission Model Coupled with the Community Land Model over East Asia  

作　　者：JIA Bing-Hao XIE Zheng-Hui 

机构地区：[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Atmospheric and Oceanic Science Letters》2011年第4期209-215,共7页大气和海洋科学快报（英文版）

基　　金：supported by the National Basic Research Program of China under Grants 2010CB951101 and 2010CB951001;the National Natural Science Foundation of China under Grant 41075062

摘　　要：The Community Microwave Emission Model (CMEM) developed by the European Centre for Me-dium-Range Weather Forecasts (ECMWF) can provide a link between surface states and satellite observations and simulate the passive microwave brightness temperature of the surface at low frequencies (from 1 GHz to 20 GHz).This study evaluated the performance of the CMEM cou-pled with the Community Land Model (CLM) (CMEM-CLM) using C-band (6.9 GHz) microwave brightness temperatures from the Advanced Microwave Scanning Radiometer on Earth Observing System (AMSR-E) over East Asia.Preliminary results support the argument that the simulated brightness temperatures of CMEM-CLM from July 2005 to June 2010 are comparable to AMSR-E observational data.CMEM-CLM performed better for vertical polarization,for which the root mean square error was approximately 15 K,compared to over 30 K for horizontal polarization.An evaluation performed over seven sub-regions in China indicated that CMEM-CLM was able to capture the temporal evolution of C-band brightness temperatures well,and the best correlation with AMSR-E appeared over western Northwest China (over 0.9 for vertical polarization).However,larger biases were found over southern North China and the middle and lower reaches of the Yangtze River.The Community Microwave Emission Model （CMEM） developed by the European Centre for Medium-Range Weather Forecasts （ECMWF） can provide a link between surface states and satellite observations and simulate the passive microwave brightness temperature of the surface at low frequencies （from 1 GHz to 20 GHz）. This study evaluated the performance of the CMEM cou- pled with the Community Land Model （CLM） （CMEM- CLM） using C-band （6.9 GHz） microwave brightness temperatures from the Advanced Microwave Scanning Radiometer on Earth Observing System （AMSR-E） over East Asia. Preliminary results support the argument that the simulated brightness temperatures of CMEM-CLM from July 2005 to June 2010 are comparable to AMSR-E observational data. CMEM-CLM performed better for vertical polarization, for which the root mean square error was approximately 15 K, compared to over 30 K for horizontal polarization. An evaluation performed over seven sub-regions in China indicated that CMEM-CLM was able to capture the temporal evolution of C-band brightness temperatures well, and the best correlation with AMSR-E appeared over western Northwest China （over 0.9 for vertical polarization）. However, larger biases were found over southern North China and the middle and lower reaches of the Yangtze River.

关 键 词：Community Microwave Emission Model Community Land Model microwave brightness temperature AMSR-E 

分 类 号：TN011[电子电信—物理电子学] TP722.6[自动化与计算机技术—检测技术与自动化装置]