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| A study of 2 cases of typical hazy weather in guangzhou during 2012 |
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Abstract Two typical hazy weather events which occurred in the Pearl River Delta (PRD) cities from Mar. 18 to Mar. 21 and from Oct. 13 to Oct. 15, 2012respectively were selected in this paper. A comprehensive analysis of the causes of the events was made by using the in-situ measurement of visibility (VIS), aerosol mass concentration (PM10/PM2.5/PM1), the concentration of black carbon (BC) at an integrated observation base for atmospheric composition in Panyu, Guangzhou, the weather type, meteorological elements and backward airflow trajectory during these events. The results are shown as follows: Daily visibility was as low as 5.3km, black carbon’s hourly concentration value was up to 19.0μg/m3, PM2.5’s hourly concentration was 163.0μg/m3at its highest. These two events were affected by the weather conditions which weren’t conducive to the transport or spread of pollutants. In PRD, low visibility of haze weather occurs mainly in condition of high relative humidity. It is deduced that aerosol has greater hygroscopicity in the dry season than in the wet season in this region.
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Received: 04 November 2013
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