Abstract
In this paper, the daily precipitation data of 19 meteorological stations in Guizhou Province from 1961 to 2015 are used. Using GIS spatial analysis method and linear trend analysis method, the distribution characteristics of annual and seasonal precipitation in Guizhou province were analyzed from space and time. The results show that: (1) From the perspective of spatial distribution, annual precipitation is generally less in the south and north and less in the east and west. The precipitation in winter and spring is east-west distribution and decreases from east to west in the four seasons. The precipitation in summer is roughly north-south and south-north less. The precipitation in autumn is mainly concentrated in southwest Guizhou and Chishui valley. (2) From the time distribution point of view, the precipitation in Guizhou Province showed a general downward trend, of which the precipitation in spring, autumn and winter showed a decreasing trend, the downward trend in autumn was more obvious, and the precipitation in summer increased but not obviously.
Highlights
Precipitation is an important element that reflects the climatic characteristics of a region and is an important climatic factor affecting or reflecting the ecological environment[1]
Most foreign experts and scholars believe that the average precipitation in the world and the northern hemisphere is a periodical change, but the trend of change in each stage is different
Zuo Hongchao et al Conducted a study on the precipitation in our country, showing that the regional average precipitation characteristics are obvious and the trend of change is not obvious[8]; Wang Yanjiao et al The regional precipitation and decadal variation characteristics of precipitation in China during 1960-2010 show the precipitation There are obvious stages of change[9]; Li Yonghua et al Analyzed the spatio-temporal features of the summer precipitation in the eastern part of Southwest China
Summary
Precipitation is an important element that reflects the climatic characteristics of a region and is an important climatic factor affecting or reflecting the ecological environment[1]. Most foreign experts and scholars believe that the average precipitation in the world and the northern hemisphere is a periodical change, but the trend of change in each stage is different. Diaz et al Obtained the study on the precipitation in the southern hemisphere, and the trend of precipitation in the mid-high latitudes and low latitudes showed consistent[7]. Zuo Hongchao et al Conducted a study on the precipitation in our country, showing that the regional average precipitation characteristics are obvious and the trend of change is not obvious[8]; Wang Yanjiao et al The regional precipitation and decadal variation characteristics of precipitation in China during 1960-2010 show the precipitation There are obvious stages of change[9]; Li Yonghua et al Analyzed the spatio-temporal features of the summer precipitation in the eastern part of Southwest China. The summer precipitation in the eastern part of Southwest China is mainly consistent with the whole region, and the frequency of occurrence is above 60%[10]
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