2011年10月珠江三角洲一次区域性空气污染过程特征分析  

Characteristics of a regional air pollution process over the Pearl River Delta during October 2011

作　　者：肖娴[1] 范绍佳[1] 苏冉[1] 

机构地区：[1]中山大学环境科学与工程学院大气科学系,广州510275

出　　处：《环境科学学报》2014年第2期290-296,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.41275017);高等学校博士学科点基金专项基金(No.20120171110028);公益性行业(气象)科研专项(No.GYHY201306042)~~

摘　　要：2011年10月18—25日珠江三角洲地区出现了一次区域性空气污染过程,重污染区域集中在西部,后期向中部转移,PM10为首要污染物.针对本次空气污染过程的研究发现,此次珠江三角洲地区空气污染过程主要受大尺度冷高压活动的影响,一直为下沉气流所控制,500 m以下近地层风速很小,边界层高度较低,存在贴地逆温层,非常不利于污染物的输送和扩散.PM10浓度与风速、能见度呈显著的负相关关系,与温度相关性不显著;且与风速和温度的相关性存在滞后性.稳定天气形势、大范围下沉气流、近地层静小风和贴地逆温是导致这次区域性空气污染过程的气象原因,PM10浓度增加导致珠江三角洲能见度下降.A regional air pollution process occurred over the Pearl River Delta （PRD） Region during 18th to 25th October, 2011. The heavily polluted region tended to move from the west to the central region of PRD and the PMlo was found to be the primary pollutant. Result showed that this pollution process was mainly affected by the large-scale activities of cold high, when the PRD was dominated by the downdraft of cold high, with weak wind at the levels lower than 500 m of the surface layer and thin boundary layer and the inversion layer close to the ground. These factors limited transportation and diffusion of pollutants. The PM10 concentration had significantly negative correlations with wind speed and visibility and a weak positive correlation with relative humility and temperature. There was a time lag for correlations between PM10 and wind speed as well as temperature. The atmospheric condition, large-scale downdraft, small wind speed and inversion layer close to the ground are the main meteorological reasons of this regional air pollution process, and the increasing PMI0 concentration led to the decreased visibility of PRD.

关 键 词：区域空气污染过程 气象影响因素 珠江三角洲 

分 类 号：X513[环境科学与工程—环境工程]