Analysis on the Climate Change from Warming-drying Trend to Warming-wetting Trend in Northwest China
BAI Ai-juan~(1,2,3),LIU Xiao-dong~1(1 Institute of Earth Environment Research,Chinese Academy of Sciences,Xi' an 710075,China; 2 Shaanxi Meteorological Observatory,Xi'an 710015;3 Graduate School,Chinese Academy of Sciences,Beijing 100039,China)
In this paper,the difference of climate change in northwest China during the periods of 1960-1990 and 1970-2000 is compared based on the data of ten-day precipitation and air temperature observed by 122 meteorological stations in northwest China,and the regional characteristics of climate change are analyzed.The results are as follows:(1) Precipitation increases in the western part of northwest China,especially in Xinjiang,but it decreases in the eastern part of northwest China,especially in Shaanxi Province.Therefore,the anomaly of precipitation decreases in the western part of northwest China but increases in the eastern part of northwest China.The precipitation in the recent 30 years has increased comparing with that in early 30 years,especially during the period from December to next early spring.The precipitation increases in some regions but decreases in some other regions in the northwestern part of northwest China;(2) The average ten-day air temperature has been significantly increased since recent 30 years comparing with that in early 30 years,which will result in a reduction of the anomaly of air temperature.The temperature increase is the most significant in winter;(3) The average values of both precipitation and air temperature in northwest China during the period of 1960-1990 were significantly different comparing with that during the period of 1970-2000 due to the difference of climate status in the 1960s and 1990s.The difference of the average precipitation in northwest China was mainly caused by the precipitation reduction in the 1990s,and that of average air temperature was mainly caused by the temperature decrease in the 1960s and the temperature increase in the 1990s.The difference of average climatic values will affect significantly the meteorological statistics,analysis,evaluation and prediction.
【Fund】： 国家重点基础研究发展规划项目(2004CB720208);; 中国科学院知识创新项目(KZCX3-SW-339);; 陕西省气象科技创新基地青年科学基金共同资助
【CateGory Index】： P467
【CateGory Index】： P467