Climate Change and Inter-decadal Fluctuation of Dry and Wet Climate in Western Liaoning Province

Western Liaoning Province is the frailty area of ecological environment and climate,which made it the hotspot.In this paper we have studied the changes on climate of western Liaoning Province and the dry-wet climate boundary shifting under the background of global warming.Based on the temperature,precipitation,humidity,wind,and solar radiation data of the 52 stations in Liaoning Province during 1961-2004,the potential evapotranspiration was calculated using the integrated Penman formula,and its temporal and spatial distribution was discussed.Furthermore,we have calculated the aridity index and analyzed the inter-decadal fluctuation of dry and wet climate.The results show that the climate boundary of dry and wet fluctuated markedly and differentiated greatly in this area over the past 44 years.The dry and wet climate had changed abruptly in 1990's.The boundary between semi-humid and humid moved towards East,but the boundary between semi-arid and semi-humid moved towards West.The dimensions of semi-arid and humid were shortened,and the dimensions of semi-humid were enlarged obviously.The status of dry and wet climate in the west of Liaoning Province was mainly controlled by West Pacific Subtropical High and Southeast Monsoon,whereas that in the east controlled by either these or the topography precipitation.