Spatial Analysis Of Accumulated Temperature In China Based On Multiful Linear Regression Interpolation

In the past 100 years,the phenomenon of global warming caused by human activities has already had a wide impact on the human life and the natural environment.In the context of global warming,this paper uses the daily average temperature data from 749 Weather stations in China from 1961 to 2012,carried out the following work:(1)The trend of the national average temperature was analyzed,the climate tendency of air temperature change is 0.225 ?/10a in 52a.The temperature in China is on the rise.Under the background of global warming and temperature rise in China,the trend of the accumulated temperature,duration,initial date and ending date was analyzed.It was found that the ?10? accumulated temperature showes an increasing trend,the duration showes an increasing trend,the initial date shows the trend in advance,the end date shows a delayed trend.(2)The accumulated temperature data are interpolated using the multiple regression linear equation.Compare the results of direct interpolation and subregional interpolation.After the interpolation based on the multiple linear regression method,the difference between the simulated value and the actual observation value is taken into account,the difference is interpolated using the Kriging method.Verification of the accuracy of the rasterization method,select 10%of the sites do not participate in the calculation,the verification result shows that the correlation coefficient between the simulated value and the actual observation value is 0.954.It is proved that the interpolated method has high correlation between the accumulated temperature and the actual accumulated temperature.The method can be used for accumulated temperature interpolation.(3)Based on the spatiotemporal distribution analysis of the average accumulated temperature from 1961 to 2010,it is found that the area of>8000?·d and 4500?8000 ?·d has increased in China.16000?·d,3400?·d,4500 ?·d and 8000 ?·d accumulated temperature contour has a tendency to move northward.Compared with the average accumulated temperature between 1981-2010 period and 1961-1990 period,the accumulated temperature was increased in most areas,and the accumulated temperature was reduced in the Sichuan Basin.