湖北省PM_(2.5)重污染过程天气分型研究  

Study on Weather Classification of PM_(2.5) Heavy Pollution in Hubei Province

作　　者：陈璇[1] 王晓玲[1] 岳言裕 陈赛男[1] 柳草[1] 李银娥[1] 王艳杰[1] CHEN Xuan;WANG Xiaoling;YUE Yanyu;CHEN Sainan;LIU Cao;LI Yin'e;WANG Yanjie(Wuhan Central Meteorological Observatory,Wuhan 430074,China)

机构地区：[1]武汉中心气象台,湖北武汉430074

出　　处：《环境科学与技术》2018年第11期54-64,共11页Environmental Science & Technology

基　　金：国家重点研发计划项目(2017YFC0212603);湖北省气象局科技发展基金重点项目(2014Z03)

摘　　要：基于2015-2016年湖北省细颗粒物PM_(2.5)监测数据,研究了湖北省17个重点城市PM_(2.5)的空间分布特征,结果表明:细颗粒物污染事件在西部和东部山区出现频率相对较小,在中部江汉平原地区出现频率较高,严重污染事件在襄阳、宜昌和武汉出现最多。结合2015-2016年天气环流背景,将影响湖北省PM_(2.5)重污染过程的天气类型分为6种:冷锋前部型(北路型、西北路型)、暖倒槽型(东高西低型、北高南低型)、均压场型和入海高压底后部型。湖北省特殊的地理构造,对不同天气类型的污染分布有一定的影响:冷锋前部型(北路型)主要影响鄂北及江汉平原地区;冷锋前部型(西北路型)主要污染区域为鄂东地区;暖倒槽型(东高西低型)主要影响江汉平原和鄂东北;暖倒槽型(北高南低型)和入海高压底后部型主要污染鄂西北、江汉平原、鄂东北西部;均压场型主要影响湖北省大部地区。不同类型的环流背景下,气流轨迹也有明显的差别。Based on the PM2.5 monitoring data of fine particles in Hubei Province from 2015 to 2016,the spatial distribution characteristics of PM2.5 in 17 key cities in Hubei Province were studied.The results showed that the occurrence frequency of pollution was relatively small in the western and eastern mountainous regions.The frequency of occurrence in Jianghan Plain area was relatively high,and serious pollution incidents occurred most in Xiangyang,Yichang and Wuhan.Combined with the background of the weather circulation in 2015-2016,the weather types affecting the heavy pollution process of PM2.5 in Hubei Province are divided into 6 types,including cold front front type (north road,northwest road),warm inverted trough type(high- er in east and lower in west,higher in north and lower in south),uniform pressure field type and high pressure approaching to sea type.The special geographic structure of Hubei Province has a certain influence on the pollution distribution of different weather types:the cold front front type (north road)mainly affects the northern Hubei and Jianghan Plain areas;the cold front front type (northwest road)is the main pollution area.In eastern Hubei,the warm inverted trough (higher in east and lower in west)mainly affects Jianghan Plain and northeastern Hubei;the warm inverted trough (higher in north and lower in south)and high pressure approaching to sea type mainly contaminates northwest Hubei,Jianghan Plain,and west of northeast Hubei,uni- form pressure field mainly affects most of Hubei Province.There are also significant differences in airflow trajectories in dif- ferent types of circulation backgrounds.

关 键 词：细颗粒物PM2.5 天气类型 后向轨迹 聚类分析 

分 类 号：X513[环境科学与工程—环境工程]