Abstract:

Abstract:Utilizing the temperature and precipitation date of 14 stations in Heilongjiang Province from 1954 to 2009,climate trend coefficient and simple regression analysis,the trend of climate change was analyzed.The results showed that the general temperature change tendency was increasing,yet the general precipitation tendency was decreasing;seasonal temperature showed upward trend,the biggest temperature heat was spring;the spring precipitation was increasing,but autumn,summer and winter were declining,the most obvious downward trend in precipitation appeared in autumn.On this basis,using climate elements cumulative test curve and test signal of noise ratio(S/N) to analyze climate mutation.The result showed that the temperature mutation appeared in 1987 and the precipitation mutation appeared in 1963、1979 and 1994,but all of them were not obvious.