Temporal And Spatial Variation Characteristics And Causes Of Local Contemporaneous Correlation Between Temperature And Precipitation In My Countr

Under the background of global warming,the global climate system is undergoing profound changes.Air temperature and precipitation,as important climatic state parameters that characterize the heat and moisture characteristics of a single station,have undergone significant interdecadal scale changes,which in turn have caused significant changes in the correlation between the two.A large number of studies have shown that the temperature and precipitation in East Asia showed a significant turning point around 1987/88.Therefore,this paper uses the temperature and precipitation data,reanalysis data,and sea ice data of Chinese stations to analyze the local temperature and precipitation related to the same period in my country in the first 30 years(1958-1987)and the next 30 years(1988-2017).The spatiotemporal variation characteristics and their causes were analyzed.The main conclusions are as follows:(1)There are obvious seasonal differences and interdecadal variation characteristics in the correlation between temperature and precipitation over the same period in my country.The four seasons in the first and last 30 years are mainly negatively correlated,and this feature is weakest in autumn and strongest in summer.Compared with the previous 30 years,in the next 30 years,the positive correlation areas in my country’s eastern coastal and northeastern regions have shrunk significantly in winter;in spring,the positive correlation areas in East China and Northeast China have decreased,while those in western China have expanded significantly;The correlation area extends to the southwest;a huge positive correlation area appears in the west in the last 30 years of autumn.Except for autumn,the negative correlation stability of stations in other seasons showed regional differences;the positive correlation stability of stations in four seasons was poor.(2)In the Northeast and East China regions in winter,and in the Jianghuai region and Northeast China region in summer,there are significant changes in temperature and precipitation over the same period.The results of the rank sum test show that the winter temperature in Northeast China changed significantly in the first and last 30 years,and the temperature and precipitation in East China changed significantly.Significant changes occur.(3)For the typical winter regions(Northeast China and East China),interdecadal variations of SST,East Asian winter monsoon,and Arctic Oscillation have a significant impact on the interdecadal significant differences in temperature in Northeast China;The wind and Pacific decadal oscillation are closely related to the significant interdecadal transition of temperature and precipitation in East China.The research results in typical summer regions(Jianghuai region,Northeast region)show that interdecadal changes in sea temperature,sea ice,and Pacific interdecadal oscillation are significantly affected by interdecadal changes in air temperature in Northeast region;East Asian summer monsoon,Arctic Oscillation and Pacific decadal The interdecadal oscillation is closely related to the significant interdecadal transition of temperature and precipitation in East China.It is precisely because of the above-mentioned changes in these influencing factors that the temperature or precipitation in the relevant regions of my country has changed,resulting in the interdecadal transition of the two around 1987/88,which in turn led to significant temporal and spatial changes in the local contemporaneous correlation of temperature and precipitation in my country..