Meteorological Causes of a Regional Persistent Fog and Haze Event in Liaoning
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Abstract:
Foggy and hazy weather occurred frequently and worsened air quality dramatically during recent yearsInvestigating the causes and improving the prediction for fog and haze are essential to guide the public and protect public healthThis paper utilizes the observational data from 62 nationallevel automatic weather stations in Liaoning and the reanalysis data from NCEP to analyze the generalcirculation background, forming conditions and persistency causes for the fog and haze process occurred from 7 to 14 November 2015 in LiaoningResults indicate: (1) The general circulation, including an upperlevel westsouthwest flow, a lowlevel warm ridge, a reversed surface trough, and a weakened surface pressure, provided favorable synoptic conditions for the fog and haze event(2) Temperature inversion was the critical cause for this persistent fog and haze eventThe inversion had different structures for foggy and hazy stages, with a lower top and thinner layer for intense fog but a higher top, a thicker layer and even multiple simultaneous inversion layers for haze〖JP2〗(3) Water vapor content was the key factor for the conversion between fog and hazeA 95% relative humidity near the surface favors fog genesis, while a 60% to 70% is optimal for hazeThe specific humidity increased when fog turns into haze, whilst it decreased with a reversed conversion(4) The weak rising motion near the surface and the weak sinking at middleupper layers dynamically intensified this foghaze event(5) The characteristics of meteorological elements differ substantially before and after the fog and haze, which provides references for predicting fog and haze
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.