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- W2365173713 abstract "Based on daily precipitation data from 50 meteorological stations in Southwest China(including Yunnan,Guizhou,Guangxi,Sichuan,and Chongqing) from 1960 to 2009 and NCEP/NCAR reanalysis data,harmonics analysis,biharmonic spline interpolation,and correlation methods were used to analyze the characteristics of autumn rainfall with climate change and its impact factors in the study area over the last 50 years.The results show the following: Autumn rainfall in Southwest China is declining,and the inter-annual variation of rainfall is predominant.Rainfall in the autumn of 2009 was the minimum amount for the last 50 years,due to a linear decreasing trend,and inter-annual and inter-decadal variations.The changes of the impact factors due to climate change,and their correlation with rainfall varied with different atmospheric layers.The surface air temperature in autumn in Southwest China showed a significant warming trend,and had an insignificant correlation with rainfall.The autumn temperature had no warming trend in the middle troposphere of 500 hPa,and had a significant negative correlation with rainfall,with a correlation coefficient of-0.34.The specific humidity at 600 hPa had a linearly decreasing trend,and a positive correlation with rainfall,with a correlation coefficient of 0.30.The horizontal divergence at 700 hPa had no linear trend,and a significant negative correlation with rainfall.The coefficients of similarity between the anomalous spatial distribution of autumn rainfall in Southwest China in 2009 and the anomalously high temperature at 500 hPa,the anomalously small specific humidity at 600 hPa,and the anomalously high horizontal divergence at 700 hPa were-0.95,0.85,and-0.46,respectively.The anomalous decrease of autumn rainfall in the study area in 2009 was caused by the coaction of thermodynamic and kinetic factors,of which the thermodynamic factors had more significant effects." @default.
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- W2365173713 date "2012-01-01" @default.
- W2365173713 modified "2023-09-24" @default.
- W2365173713 title "Characteristics of autumn rainfall with climate change and its impact factors in Southwest China" @default.
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