Classification of air pollution synoptic patterns and air pollutants transport/purification effect by cold front over Hangzhou
YU Bu1,2, ZHU Bin1, DOU Jing-jing3, ZHANG Wei-wei4, HU De-yun2
1. Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. Hangzhou Meteorological Bureau, Hangzhou 310051, China; 3. Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China; 4. Zhejiang Meteorological Bureau, Hangzhou 310051, China
Abstract：In this paper, the seasonal atmospheric circulation patterns over Hangzhou were classified, based on the Lamb-Jenkinson weather classification method. Meanwhile, we summarized the seasonal air pollution characteristics of the typical atmospheric circulation patterns with the aid of PM2.5 dataset from the national climate station in Hangzhou. Because the uncertainty of PM2.5 levels were large under cold front synoptic condition, the pollution transport and purification characteristics were analysed in autumn and winter. The results showed that in Hangzhou, winter, dominated by anticyclone and warm zone in front of cold front, was the worst polluted season. Spring and autumn are secondary. Serious air pollution was almost impossibly occured in summer. In addition, identifying by the features of temperature variability and wind speed, we found that the weak cold front was favour of pollution transport in the conditions of negative temperature variability in 24hours within 0℃ and 2℃, or the average wind speed below 2m/s. It was conducive to purify the pollution for the strong cold front which was in the condition of negative temperature variability in 24hours larger than 4℃, or the average wind speed higher than 4m/s.
俞布, 朱彬, 窦晶晶, 张玮玮, 胡德云. 杭州地区污染天气型及冷锋输送清除特征[J]. 中国环境科学, 2017, 37(2): 452-459.
YU Bu, ZHU Bin, DOU Jing-jing, ZHANG Wei-wei, HU De-yun. Classification of air pollution synoptic patterns and air pollutants transport/purification effect by cold front over Hangzhou. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(2): 452-459.
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