Characteristics of precipitation and its spatiotemporal evolution in southeast Tibet in the last two decades
In the background of global warming,changes in precipitation in southeast Tibet will not only influence the distribution of regional water resources,but will also have an important impact on the regional water cycle and the evolution of permafrost.In this paper,we analyze the spatial and temporal distributions as well as the characteristics of evolution of precipitation recorded at 76 meteorological stations in southeast Tibet from 2000 to 2021 by using inverse distance weighted interpolation,the rotational empirical orthogonal function(REOF),Sen's method of slope estimation,Manne-Kendall trend test,and Morlet wavelet analysis.The results show that precipitation in southeast Tibet was generally high in the east and low in the west,while raining and hot during the same peroid occurred in the same season.We used the REOF,to divide the study area into 10 sub-regions.The precipitation in different sub-regions exhibited prominent regional characteristics.It showed a trend of in creases in the eastern regions Ⅰ,Ⅱ,Ⅳ,Ⅵ and Ⅹ trendvarying degrees.The annual average precipitation and period sub-region.The results can provide support for the formulation of ecological and environmental protection in southeast Tibet.
万方数据
维普
