【摘要】 利用MM5-CMAQ模式系统,对2011年12月8—16日长江三角洲一次大气污染过程进行模拟.在NO x排放源影响下,上海和杭州是NO2高值区.杭州西南部,安徽、浙江和江西3省交界处O3质量浓度较高,在40 ppb以上.受SO2排放源影响,上海和南京的SO2浓度较高,高值中心在50 ppb以上.过程分析结果表明,污染扩散过程减弱时,平流输入和排放的SO2、排放和化学转化的NO2逐渐累积;污染过程出现时,夜间排放的NO也逐渐累积,NO2的化学转化过程变慢,O3质量浓度下降.更多还原

【Abstract】 An air pollution episode over the Yangtze River Delta( YRD) during the period from 8to 16 Dec 2011 was investigated using MM5-CMAQ model system. There were high NO2concentrations in Shanghai and Hangzhou. Ozone concentrations were greater than 40 ppb in the southeast of Hangzhou and on the borders between Anhui,Zhejiang,and Jiangxi provinces. The SO2concentrations in Shanghai and Nanjing were high. The pollution episode occurred when SO2from emission and NO2from chemical and emission processes accumulated under weak diffusionconditions. NO also accumulated consuming ozone and resulting in a decrease of O3concentration.更多还原