The Adaptation Estimate Of The Surface Humid Index In Jianghuai Area Of China

The drought, being the most Threaten serious environmental problems of human survival, the most severe and the most destructible meteorological disasters at same time. In recent year, the drought disasters was severe than the past not only in north China, but also south China showed the trend of wet to dry on the global climate warming background.In this dissertation, based on the160observational station’s data of monthly precipitation and mean monthly temperature over China from1951to2009, monthly mean temperature, monthly precipitation of60meteorological stations in Jianghuai area from1961to2005, by use of the surface humid Index computed from the data, the inter annual variation and decadal variation of the surface humid index, precipitation and temperature have been analyzed. By amend the surface humid index lead into SPEI to describe the time of occurrence drought intensity and duration of drought disasters. Because meteorological drought and agricultural drought can not reunification. Use drought monitoring observational data of the United of drought monitoring scientific and experimental base in Nanjing University of information Science&Technology, investigate the loss of atmospheric moisture in periods of drought and moisture in the soil supplementary atmospheric moisture by winter and spring drought in2011as example simultaneously.The results indicated:(1). South China, Southwestern China, Tibet area showed the trend of wet to dry in early90’s. Yangtze Plain, Middle and Lower showed the trend of wet to dry in early90’s, and keep conspicuous drying although showed the trend of dry to wet in early70’s.(2). It scientific and accurate by use SPEI to evaluation Yangtze&Huaihe River basin of drought disasters. In the semi-arid and semi-humid area of Yangtze&Huaihe River basin, the drought simulation results using SPEI index were scientifically similar with the actual record in most cases, particularly in the severe drought periods; however, there were a few of periods in which the SPEI simulation result do not match with the record as well.(3). In recent years, temperature continued rises, and the lack of precipitation lower than normal years. The drought began as early as october in2010of Nanjing. During late March until may precipitation minimum value of the history of the same period. Potential evaporation enhancement and large number of surface moisture evaporation. The deep moisture of soil constantly supply to the surface, but still lack of precipitation recharge. So loss of water Seriously and the increase of drought mainly. until the greatest fluctuate of rainfall late of June. Nanjing showed the trend of dry to wet and outbreak floods.