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利用中国区域地面气象要素驱动数据集(China Meteorological Forcing Dataset,CMFD),驱动中国科学院大气物理研究所陆面数据同化系统(LDAS-IAP/CAS-1.0),得到了2003—2010年中国区域土壤湿度数据集,同时不考虑同化卫星遥感亮温数据,直接驱动CLM3.0模拟了2003—2010年中国区域土壤湿度时空变化。将二者土壤湿度模拟结果、地面土壤湿度观测值、美国国家环境预报中心(NCEP)气候再分析数据(CFSR)、基于主动和被动微波传感器的全球土壤湿度数据(SM-MW)进行对比分析发现,考虑同化卫星遥感亮温后与不考虑同化模拟的土壤湿度空间分布有明显差异。将模拟、同化土壤湿度值与观测值对比发现,同化后的青海、甘肃、宁夏和陕西地区土壤湿度较模拟结果有一定的改善。相对于CFSR再分析数据和SM-MW遥感反演数据,模拟和同化土壤湿度值在35°N以南对土壤湿度空间分布的细节刻画更为细致。同化卫星遥感亮温数据后,从2003—2010年土壤湿度四季和年平均空间分布看出,土壤湿度空间分布从西北向东南增加。东北、江淮地区及青藏高原为土壤湿度高值区,新疆和内蒙古为土壤湿度低值区。从变化趋势来看,内蒙古、青藏高原和新疆南部年平均土壤湿度呈增加趋势,其他地区以减小趋势为主。
Using the China Meteorological Forcing Dataset (CMFD) data set and driving the Land Surface Data Assimilation System (LDAS-IAP / CAS-1.0) from the Institute of Atmospheric Physics, Chinese Academy of Sciences, the soil moisture Dataset without considering the assimilation satellite remote sensing temperature data, directly driven CLM3.0 to simulate the spatial and temporal changes of soil moisture in China in 2003-2010. The results of soil moisture simulation, surface soil moisture observations, NCEP climate reanalysis data (CFSR), and global soil moisture data (SM-MW) based on active and passive microwave sensors were compared , There is a clear difference in the spatial distribution of soil moisture after assimilating satellite remote sensing with or without assimilation simulation. Comparing the simulated and assimilated soil moisture values with the observed values, it was found that the assimilated soil moisture in Qinghai, Gansu, Ningxia and Shaanxi regions had a certain improvement compared with the simulation results. Compared with the CFSR reanalysis data and the SM-MW remote sensing data, the details of the spatial distribution of soil moisture are simulated more accurately by simulating and assimilating the soil moisture values to the south of 35 ° N. After assimilating satellite remote sensing brightness temperature data, from the four seasons and the annual average spatial distribution of soil moisture from 2003 to 2010, the spatial distribution of soil moisture increased from northwest to southeast. Northeast China, the Yangtze River Huaihe area and the Qinghai-Tibet Plateau are high soil moisture areas, while Xinjiang and Inner Mongolia are low soil moisture areas. According to the change trend, annual average soil moisture in Inner Mongolia, Qinghai-Tibet Plateau and southern Xinjiang tended to increase, while in other regions, the trend of decrease was mainly dominated.