Climatic Changes of Different Level Precipitation in the East of Gansu Province
Using the daily precipitation observational data at Xifeng meteorological station located in the east of Gansu Province from 1951 to 2010,the climate change characteristics of the precipitation and its spectrum in recent 60 years were analyzed,and the climate mutation of precipitation was detected by using cumulative anomaly and Mann-Kendall test.The results show that the annual precipitation presented an obviously decreasing trend,and light,moderate and heavy rain had positive contribution to the total rainfall,while rainstorm had negative contribution in recent 60 years.The annual precipitation displayed a weak increasing trend during 1986-2010 due to the increasing rainfall,increasing rain days and enhancing rainfall intensity of heavy rain.These changes still belong to the category of annual variation.Therefore,it is believed that the mutation of precipitation hadn' t occurred yet,but the precipitation since 1986 showed increasing signs.
the east of Gansuprecipitation spectrumclimate changetendency
NETL
NSTL
万方数据
维普
