综合利用3组AMSR-E地表土壤水数据产品,运用集合分析的方法,生成中亚20032010年410月月均地表含水量数据,而后结合Climatic Research Unit(CRU)数据,分析了中亚8 a来地表土壤水变化特征及其对降水、气温等气候变化的响应。研究结果表明:1中亚地区地表土壤水含量从西南向东、向北逐渐降低。2中亚地区植物生长季及春、夏季地表土壤水均以变干为主,而秋季则以变湿为主。3集合分析数据时空分布与降水类似,与气温相反。在时间变化趋势上,中亚大部分地区降水减少、气温升高。夏季降水急剧减少而气温显著上升对中亚地区植物的生长是很不利的。4相关性分析结果表明,降水减少、气温升高是导致中亚植物生长季土壤干化的主导因素之一。
英文摘要:
An ensemble method was used to combine three AMSR-E SSM (surface soil moisture) products to reconstruct a monthly mean soil moisture data set from April to October of 2003 - 2010 for Central Asia.Using the ensemble data set and CRU (Climatic Research Unit) data,the temporal-spatial variations of SSM and its responses to the precipitation and air temperature in 8 years were analyzed.Results showed that: ① The SSM increased gradually from southwest to east and north of Central Asia.② The SSM in autumn was dominated by wetting trend, while it was dominated by drying trend in plant growth season,spring and summer.③ The spatial patterns of averaged ensemble SSM in growing season was similar to precipitation while it was opposite to air temperature,and most parts of Central Asia became drier and warmer.The precipitation of summer decreased dramatically and temperature increased significantly,which was unfavorable to the vegetation growth in Central Asia.④ The correlation analysis showed that decreased precipitation and increased temperature is one of the main factors that led to the SSM in growth season decreasing in Central Asia.