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Meteorological conditions for the persistent severe fog and haze event over eastern China in January 2013

查看全文 作　　者：ZHANG [1]RenHe;LI [2]Qiang;ZHANG [3]RuoNan 高影响力作者 机构地区：[1]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences;[2]Audio and Video Center, China Meteorological Administration;[3]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics,Chinese Academy of Sciences高影响力机构 出　　处：《Science China Earth Sciences》索引2014年第57卷第1期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant No.41221064);the International S&T Cooperation Project othe Ministry of Science and Technology of China(Grant No.2009-DFA21430) 摘　　要：In January 2013,a severe fog and haze event(FHE)of strong intensity,long duration,and extensive coverage occurred in eastern China.The present study investigates meteorological conditions for this FHE by diagnosing both its atmospheric background fields and daily evolution in January 2013.The results show that a weak East Asian winter monsoon existed in January2013.Over eastern China,the anomalous southerly winds in the middle and lower troposphere are favorable for more water vapor transported to eastern China.An anomalous high at 500 hPa suppresses convection.The weakened surface winds are favorable for the fog and haze concentrating in eastern China.The reduction of the vertical shear of horizontal winds weakens the synoptic disturbances and vertical mixing of atmosphere.The anomalous inversion in near-surface increases the stability of surface air.All these meteorological background fields in January 2013 were conducive to the maintenance and development of fog and haze over eastern China.The diagnosis of the daily evolution of the FHE shows that the surface wind velocity and the vertical shear of horizontal winds in the middle and lower troposphere can exert dynamic effects on fog and haze.The larger(smaller)they are,the weaker(stronger)the fog and haze are.The thermodynamic effects include stratification instability in middle and lower troposphere and the inversion and dew-point deficit in near-surface.The larger(smaller)the stratification instability and the inversion are,the stronger(weaker)the fog and haze are.Meanwhile,the smaller(larger)the dewpoint deficit is,the stronger(weaker)the fog and haze are.Based on the meteorological factors,a multi-variate linear regression model is set up.The model results show that the dynamic and thermodynamic effects on the variance of the fog and haze evolution are almost the same.The contribution of the meteorological factors to the variance of the daily fog and haze evolution reaches 0.68,which explains more than 2/3 of the variance. 关 键 词：中国东部地区 天气演变 气象条件 事件 霾 异常反演 水汽输送 不稳定性
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