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Analysis of Climatic Characteristics and Weather Conditions for Fog over the JingJinTang Expressway

Tian Hua1 Wang Yawei2(1.National Meteorological Centre Beijing 100081;2.The Office of China Meteorological Administration)  
Using fog data and weather observation data around Beijing,Tianjin,Tanggu stations from 1949 to 2002,the characteristic and weather conditions of fog over JingJinTang expressway are analyzed.Results show that the annual mean fog days are between 15 and 19 days along the JingJinTang expressway.The inter-annual changes of fog between Beijing and Tianjin stations are same.But there is a little downtrend for fog days in Beijing,while a little uptrend in TianJin and Tanggu.The fog appears easily from wee hours to the time around sunrise,and disappers gradually after sunrise over Jing-Jin-Tang expressway.There is an index degression correlation between the duration of fog and time.The weather factors such as the surface temperature,relative humidity,wind speed and so on have good indications for fog forecasting over the JingJinTang expressway.When the surface temperature is between-5℃ and 5℃,the wind speed is less than 4m·s-1 and the relative humidity is between 90% and 100%,fog appears more easily.
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