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Climatic Characteristics and Change Laws of Fog and Haze Days in Shanghai

JIN Li-mei,SHI Jun(Shanghai Climate Center,Shanghai 200030,China)  
Based on the fog and haze data from 11 meteorological stations in Shanghai,the temporal and spatial climatic characteristics and change laws of fog and haze days in recent 50 years were analyzed.The results indicate that from 1951 to 2007,the fog days in urban area of Shanghai was significantly decreased.Fog days in exurban area of Shanghai were the most in 1970s and 1980s,the least in the first 7 years of the 21st centuries.Haze days in urban and exurban areas of Shanghai were increased from 1954 to 2007 as a whole,and such increase was mainly occurred after 1980.During the period of 2001 to 2003,haze days were the most in Shanghai.In winter,Shanghai has the most fog and haze days,and in summer,it has the least fog and haze days.From 1960 to 2007,fog days were decreased in most regions of Shanghai,but haze days were increased in all regions of Shanghai,especially the haze days increased rapidly in urban.
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