Title: Diagnostic and Analysis of Consecutive Fog Process on Large-Scale in East China Region
Abstract: Using the surface observation data,upper probe data and NCEP/NCAR reanalysis data,the characteristic,property and circulation of consecutive fog process on large-scale in East China from 30 January to 10 February 2009 are analyzed,and the water vapor and dynamic conditions are diagnosed,then the difference between the processes of fog and haze in middle-east China in the first ten days of January 2008 is briefly compared.The progress mainly belongs to radiation fog,and the fog is the most serious during 05:00~08:00 in the morning.The whole process is divided three stages,while it is the more serious on January 31,February 1,5,10.There is zonal-type circulation in middle-high latitudes,and westerly flow is relative flat and straight,so it is difficult for cold air moving southward to middle-east China.East China is basically controlled by the equal high pressure field,so the pressure gradient force and near-surface wind are very small,and it is beneficial to the formation and maintenance of fog.Interpretation of the physical quantity distribution is very good for the occurrence and maintenance conditions of fog.1~3 m·s-1 surface wind,divergence,negative vorticity,weak vertical movement in lower level are the dynamical conditions of fog formation.The configurations of small relative humidity,little difference of dew point to air temperature on lower level,and relative dry in middle troposphere constitutes water vapor condition of the fog.Inversion layer on lower level and stratified stable atmospheric stratification stability compose of stable condition.The process is significant different to the fog and haze in middle-east China in the first ten days of January 2008.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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