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The characteristics of atmospheric boundary layer during tropical cyclone process and its influence on air quality over Pearl River Delta region |
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Abstract Based on the sounding data at 3 stations from the boundary layer observation experiment over Pearl River Delta (PRD) region during July 2006 and the corresponding hourly wind data from other 9 meteorological stations, the influences of tropical cyclone process on air quality over PRD region were discussed by analyzing the gradient and fluctuation of wind and temperature measured in the observation experiment, and the variation characteristics of atmospheric boundary layer in haze weather which affected by tropical cyclone process were also analyzed. It was found that, the air quality was strong influenced by the tropical cyclone when typhoon center was near coastland of East Guangdong and Fujian provinces. During the haze weather which impacted by peripheral subsidence flow of tropical cyclone process, the PRD region was under the control of uniform pressure field, and the wind was light in most parts of PRD, the wind speed was small in boundary layer and sea-land breeze had significant influence on air quality. Before tropical cyclone landing, temperature inversion layer occurred in 200~500m, the maximum mixing layer height decreased to lower than 500m dramatically.
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Received: 21 January 2013
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