SPATIO-TEMPORAL VARIATION OF EVAPORATION UNDER A WARMING CLIMATE IN SOUTHWEST GUIZHOU PLATEAU OF CHINA

Despite the observed a warming climate, observations across many regions show that the rate of evaporation at a regional scale has been decreasing over the past 50 years, the changes of evaporation have attracted widespread attention due to it is important for understanding the global hydrological cycle and agricultural production. It is necessary to explain the spatio-temporal variation of evaporation due to the Southwest Guizhou Plateau strongly influences climatic and environmental changes in China. In this paper, we present an analysis of changes in the spatio-temporal variation and the abrupt changes of evaporation with a warming climate based on time series data from 1961 to 2015. The results showed that the mean annual evaporation decreased from 1961 to 2015 with the linear trend of -1.86 mm/year, the seasonal evaporation is estimated to decrease 1.26, -1.09, -0.27, and -0.24 mm/year for spring, summer, and autumn. The annual evaporation was largest in the south and southwest, while significantly lower in the north and northeast. The evaporation of annual and seasonal have abrupt change with a decreasing trend despite under a warming climate, and the annual, spring, and summer evaporation all exceeds the confidence level of 99%. Incontrovertible, Southwest Guizhou Plateau has occurred a pan evaporation paradox, which was thought to be affected by global warming and climate change and this effect will continue. Evaporation should be continuously measured and monitoring programs should be established to help further understand the regional responses of agricultural production and sustainable use and management of water resources.