ң�м�����Ӧ�� 2004, 19(5) 424-430 DOI:     ISSN: 1004-0323 CN: 62-1099/TP

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A Review of Land Data Assimilation System
HUANG Chun-lin, LI Xin
(Cold and Aird Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou730000,China)

The improvement and development of atmospheric and oceanic data assimilation system promotesthe study of land data assimilation system (LDAS). In the beginning of 21st century, with the formationof the North American Land Data Assimilation System(NLDAS) and the Global Land Data AssimilationSystem(GLDAS), the study that utilizes satellite and radar data to assimilate soil moisture, surfacetemperature and energy flux has being carried on. At the same time, the land data assimilation has beenthe hotspot of the study in land surface process and hydrology process. In this paper, the main frameworkof land data assimilation system is summarized in detail. The North American Land Data AssimilationSystem (NLDAS) and Global Land Data Assimilation System (GLDAS), European Land DataAssimilation System (ELDAS) and West China Land Data Assimilation System (WCLDAS) areintroduced. At last, some problems that need to be resolved in the study of land data assimilation systemare pointed out.

Keywords: Data Assimilation   Land Surface Model,   Kalman Filter   Simulated Annealing  
�ո����� 2004-05-07 �޻����� 2004-08-02 ����淢������ 2004-10-20 


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