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《Climatic and Environmental Research》 2010-01
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Preliminary Assessment on Changes of Fog in the Region around Three Gorges Reservoir after Water Pounding

YU Jun1,2,WANG Zunya3,and ZHANG Qiang31 Department of Atmospheric Sciences,School of Physics,Peking University,Beijing 1008712 Department of International Cooperation,China Meteorological Administration,Beijing 1000813 National Climate Center,Beijing 100081,China  
Climatic variation characteristics of fog days in the region around the Three Gorges Reservoir since 1954,especially the changes after water pounding in 2003,are analyzed based on the daily observation dataset of fog days,relative humidity,and visibility at the six stations around the Three Gorges Reservoir. It is found that the numbers of fog days show a weak increasing trend from 1954 to 2007,while they had a significant decreasing trend after water pounding in 2003. The possible reason for the obvious decrease of fog days after water pounding is discussed. The mean temperature has significant negative correlation with relative humidity,and strong positive correlation with the number of fog days in the region around the Three Gorges Reservoir. It's the important factor of fog variation in the region aroud the Three Gorges Reservoir that the temperature change has an impact on relative humity,and affects the frequency of fog further. The mean temperature has increased greatly since the 1990s,and the relative humidity as well as the fog frequncy has decreased obviously since the 2000s in the region around the Three Gorges Reservoir. These changes result from both the climate warming and the urbanization. Additionally,analyse shows that both the number of fog days and relative humidity have obvious and similar interdecadal oscillations,with relative high values from the 1960s to the 1970s and in the early 21st century but low from the 1980s to the 1990s. This significant interdecadal oscillation affected the decrease of relative humidity and then fog days after water pounding,as the years after 2003 belong to the downward phase of the interdecadal oscillation. The comparison analysis shows that the local effect of the water pounding is limited,with the climatic background being dominant.
【Fund】: 国家自然科学基金40905036;; 国家科技支撑计划课题2007BAC29B02;; 中国气象局基本建设项目“三峡库区气候监测、预警、评估业务运行和改进”2008-2012208
【CateGory Index】: P426.43
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