Influence of the Evaporation on the Temperature and Precipitation in Benxi Cold Mountainous Area from 1953 to 2009

Based on the monthly average temperatures,precipitation and small evaporation data in Caohekou from 1953 to 2009,the method of liner tendency rate and Mann-Kendall(i.e.M-K) are used to conduct mutation test the of evaporation.The result shows that annual evaporation has a volatile increase tendency in cold mountainous area and the linear tendency rate is 30.16 mm/10a of linear tendency rate.The evaporation of four seasons tends to increase.The annual evaporation increases along with temperature increment.The annual evaporation reduces along with the increases of precipitation.The maximum value of the evaporation of water surface appears in May,and the minimum value appears in January.