Abstract:

In order to provide the scientific basis and background of climate change to the rational development of water resources use, the author analyzed the trends and impacts of evaporation of main climate factors in Chaoyang by using linear correlation analysis method and meteorological data during nearly 58 years were used. The result showed that: the trends in evaporation were significant decreased, the annual evaporation rate was -110.54 mm/10 a and the evaporation decreased 641 mm during 58 years. The climate change evaporation rates in spring, summer and autumn were -45.92 mm/10 a, -47.98 mm/10 a and -14.76 mm/10 a, respectively. And the evaporation decreased in spring, summer and autumn were 266 mm, 278 mm and 86 mm, respectively. The changes in winter were shown a slight decreased trend. The change of evapotranspiration was affected by many factors, such as diumal temperature range, sunshine duration, wind speed, relative humidity, vaporpressure and minimum temperature. The thermodynamic factors of sunshine hours, diurnal temperature and minimum temperature were closely correlated with wind speed and evaporation.