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《Journal of Glaciology and Geocryology》 2008-02
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The Response to Two Global Warming Periods in the 20th Century over the Arid Central Asia

WANG Jin-song1,2,CHEN Fa-hu2,JIN Li-ya2,WEI Feng1(1.Institute of Arid Meteorology,China Meteorological Administration,Key Open Laboratory of Arid climatic Change and DisasterReduction,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Lanzhou Gansu 730020,China;2.Center for Arid Environment and Paleoclimate Research,National Laboratory of West China's EnvironmentalSystem,Lanzhou University,Lanzhou Gansu 730000,China)  
Based on the data of temperature in the arid Central Asia,the North Hemispheric sea level pressure(SLP),the winter index of Siberian high and the westerly(zonal) index(ZI-M) from 1901 to 2002,the response to global warming in this area in the 20th century and the main meteorological factors resulting in temperature anomaly are analyzed.The analyses show that there are significant discrepancies of the response character between the two global warming periods in the 20th century over the arid Central Asia.For the first warming period from the 1920s to the 1940s,there was no single response in the whole arid area,except for the eastern marginal area,where monsoon is dominant.However,for the second warming period after 1970s,the whole arid area has an overall response.The abnormally deepened Icelandic depression,the substantially intensified high in the North Atlantic Azores,the anomalously reinforced Ural high's ridge,the obviously weakened index of the Siberian high and the singularly strengthened ZI-M are the factors causing the higher temperature in the arid Central Asia.The above-mentioned factors can be used to explain the difference in the impacts of global warming on the arid central Asia between the 1920s-1940s and the 1970s-1990s.As one of the influencing non-atmosphere factors,the sun activity has periodic impact on the temperature over the arid Central Asia.But,there is no pronounced correlation between the sun activity and the temperature over the arid Central Asia in a century time scale.
【Fund】: 国家重点基础研究发展规划(973计划)项目(2002CB714004);; 国家自然科学基金创新群体项目(40421101);; 国家自然科学基金项目(40775057)资助
【CateGory Index】: P467
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