|关键词: 天气形势 空气污染 气象特征 数值模拟 杭州
|Analysis of the Characteristics of Different Weather Condition Impact on Air Quality in Hangzhou by Case Studies
WANG Xueyuan，JIANG Yaping，LIU Hongnian，ZHANG Ning
School of Atmospheric Sciences，Nanjing University，Nanjing，Jiangsu 210023，China
|Using the observation data of Hangzhou meteorological bureau，final reanalysis data provided by NCEP and the WRF model results，the meteorological and pollution characteristics of four cases by different weather types in each season （spring，summer，autumn，winter） from 2011 to 2012 were analyzed. By contrast，another case in the summer of 2012 which was propitious to the spread of pollutants also was analyzed. The results showed that there had four kinds of weather types（the forepart of high pressure，the bottom of high pressure，high pressure control and the back of high pressure）easily occurred light air pollution. The result indicated by the synoptic situation showed that when the 500 hPa level synoptic maps had stable high pressure system and simultaneously was affected by the southwest airflow，and the 850 hPa level synoptic maps had worm advection，and 1000hPa level synoptic maps had low wind speed would easily cause the accumulation of the pollutants，and occur air pollution episode. The WRF model results showed that the northerly direction and small wind speed was easily leading to the air pollution incidents. On the other hand，under the southerly direction and larger wind speed condition，the air quality was generally good. The analysis of the temperature stratification showed that the deep inversion layer and the neutral or stable temperature stratification at the surface layer and upper air would cause to the accumulation of pollutants at the bottom layer，and meanwhile leading to the air pollution.
|Key words: Synoptic situation Air pollution Meteorological conditions Model simulation Hangzhou