Research on Change Characteristics and Future Trend of Climate of Kaifeng City from 1951 to 2018

According to the meteorological data of Kaifeng city from 1951 to 2018, the climate change characteristics and future trends of Kaifeng city were analyzed by using the 5-year moving average method, linear trend method, Mann-Kendall trend test, variable scale range analysis method and sliding T test method. The results show that :(1) before 1970, the annual precipitation of Kaifeng city showed an insignificant decreasing trend; After 1970, the precipitation showed a significant decrease trend, and the precipitation will continue to decrease significantly in the future. The annual precipitation of Kaifeng city changed around 2011. (2) Over the years, the annual average temperature of Kaifeng and the average temperature of spring, summer, autumn and winter have all shown a significant increase trend. Among them, warming in winter and spring contributed the most to Kaifeng climate warming. In the future, the temperature in Kaifeng area will continue to increase year by year. The average temperature changed abruptly around 1993. (3) The sunshine hours showed a significant decrease trend. In the future, the average sunshine hours of the month in Kaifeng area will continue to decrease year by year. The average sunshine hours of the month changed abruptly around 1997.