Spatial Distribution and Temporal Variation of Soil Moisture over China Part I: Multi-data Intercomparison
Spatial Distribution and Temporal Variation of Soil Moisture over China Part I: Multi-data Intercomparison
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发表时间：
2008
影响因子：
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通讯作者：
Z. Wen;Z. Tian;Y. Ru
中科院分区：
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作者：
Z. Wen;Z. Tian;Y. Ru
土壤湿度是影响气候的重要因子之一，但由于资料覆盖率的不足，限制了土壤湿度在气候中作用的研究进展。本文收集了欧洲中期天气预报中心（ECMWF）40年再分析资料（ERA 40）、国家环境预测中心/国家大气研究中心（NCEP/NCAR）再分析数据，全球土壤湿度项目产品，利用观测资料对这四套中国大陆土壤湿度资料的质量进行了评价，结果表明：结果表明，4个土壤水分数据集的空间格局与观测结果基本一致，其中GSWP 2数据的空间格局最好，土壤湿度由西北向东北和东南逐渐增加，东北和南方湿润，结果表明，在中国西北部和北方地区，土壤湿度的季节变化规律最好，而ERA 40资料与观测资料的相关性最好，降水与土壤湿度的年际变化均呈显著的正相关，而降水与ERA 40资料的相关性最好，降水与ERA 40资料的相关性最好，降水与ERA 40资料的相关性最好。降水量与前期土壤湿度无显著相关性，土壤湿度与气温的关系复杂，且存在区域差异。
Soil moisture is one of the most important factors affecting the climate.However,deficiency of data coverage has limited the progress of soil moisture studies in terms of its role in climate.In this paper,four sets of widely-used soil moisture data are collected,i.e.the European Centre for Medium Range Weather Forecasting(ECMWF) 40-year reanalysis(ERA40),the National Centers for Environmental Prediction/National Center for Atmospheric Research(NCEP/NCAR) reanalysis data,Global Soil Wetness Project product,and the output of the Community Land Model forced by observational atmospheric conditions.Qualities of these four sets of soil moisture data over mainland China are evaluated by using observational evidences.The results show that the spatial patterns of the four soil moisture data sets generally agree well with the observation.The GSWP2 data are the best one among four datasets in producing the observational pattern,i.e.,the soil moisture gradually increases from northwestern to northeastern and southeastern China,with northeastern and southern China being wet,northern and northwestern China being dry.The seasonal cycle of GSWP2 soil moisture is also better than any of the others.The ERA40 data have the highest correlation with the observation in producing the interannual variability of the soil moisture.All data show significant positive correlation between the precipitation and later time soil moisture,while no significant correlation can be found between precipitation and preceding soil moisture.The relationship between the soil moisture and air temperature is complex and the results are region-dependent.