多源土壤濕度數(shù)據(jù)的比較及土壤濕度對降水的影響研究
[Abstract]:Based on the observed data of soil moisture in the China region from 1992 to 2010, The reliability of two sets of soil moisture data from European Space Agency (European Space Agency) satellite remote sensing retrieval (ESA) and ERA-Interim reanalysis (ERA) in typical regions was evaluated. The results show that; Both soil moisture and soil moisture can well describe the change of soil moisture in the observed area, but there are temporal and spatial differences in mean and trend consistency. ESA and ERA data can well describe the spring and summer in China. Dry and wet distribution pattern of soil moisture in three seasons of autumn. In the degree of dry and wet, ESA is drier than observation in northern area, wetter than observation in Jianghuai and southwest, ERA is wetter than observation in north and southwest, and drier than observation in Jianghuai. In some regions of Jianghuai and North China, the correlation between ERA and observed data is higher than that of ESA.. In the three seasons, the correlation between ESA,ERA and observed data is high, and in autumn, the correlation is the best. In most regions of China, the deviation of ESA is smaller than that of ERA, and the variation trend is consistent with observation in most areas. In space, the spatial range of the variation trend of ERA in Northeast, North China and Southwest China is obviously different from that observed, and the range of drying is obviously larger than that of observation. However, ERA can better reflect the interannual variation of observed soil moisture. Compared with the western region, the ERA of the eastern region is the best agreement with the observation, and the ESA is the best agreement with the observation in the period or region which is less affected by precipitation, vegetation, topography and so on. The description of soil moisture in autumn is more accurate than that in spring and summer, and the soil moisture in autumn is more accurate than that in spring and summer. In addition, the effects of soil moisture on land precipitation are discussed by using the numerical simulation results of the drought working Group of the Climate variability and predictability Program in the United States. Six main arid regions in the world are analyzed. The results are as follows: the arid regions of North America and South America are most affected by sea temperature type, the soil moisture of PcAw is wetter and the difference of precipitation is bigger, and the difference of precipitation is also larger in arid region of North Africa, the soil humidity of PwAc is wetter and the difference of precipitation is bigger. The Bonn ratio difference does not represent the change of precipitation in North Africa, the soil moisture of PwAc in Australia is wetter, the precipitation difference is smaller than PcAw, the seasonal variation is the largest in the arid area of South Africa, but it is also affected by SST, but there is no seasonal rule. In arid areas of northwest China, the greater the soil moisture difference is, the greater the precipitation difference is except in winter.
【學(xué)位授予單位】:成都信息工程大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S152.71
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