安顺市8次持续2天的PM_(2.5)污染气象成因分析  

Meteorological cause analysis of 8 PM_(2.5) pollution lasting for 2 days in Anshun

作　　者：蒙军[1] 徐良军[1] 吴哲红[1] 曾妮 王冉熙 MENG Jun;XU Liangjun;WU Zhehong;ZENG Ni;WANG Ranxi(Anshun Meteorological Bureau,Anshun 561000,China)

机构地区：[1]贵州省安顺市气象局,贵州安顺561000

出　　处：《贵州科学》2022年第3期50-57,共8页Guizhou Science

基　　金：安顺市科学技术局项目(安市科社[2020]01号):安顺市重污染天气预报预警研究;贵州省气象局科研业务项目(黔气科登[2021]11-07号);安顺城区空气污染的气象成因研究。

摘　　要：利用2017年—2018年安顺城区4个空气质量监测点逐小时监测数据、安顺国家基本气象站地面逐小时观测数据、NECP1*1逐6小时再分析数据等分析了2017年—2018年安顺城区8次连续2天PM_(2.5)空气污染期间PM_(2.5)浓度与天气形势、气象要素、大气层结条件等的关系及造成空气污染的气象成因,结果表明:(1)安顺城区连续2天的PM_(2.5)空气污染大都出现在秋冬季,且出现空气污染期间无降水或降水很弱;(2)逆温层强度越强,厚度越厚,就越有利于PM_(2.5)浓度的增加,如果逆温持续时间长,PM_(2.5)维持高浓度的时间也会增长,从而导致空气污染;(3)相对湿度、温度露点差、0~3 km垂直风切变、0~6 km垂直风切变与PM_(2.5)浓度之间有显著的相关性,且PM_(2.5)的浓度和垂直风切变呈正相关;(4)整层大气温度上升时有利于PM_(2.5)的扩散,700 hPa以下风速小于4 m/s时有利于PM_(2.5)的积累。Based on the hourly monitoring data of pollutants at 4 air quality monitoring points in Anshun from 2017 to 2018,the hourly ground observation data of Anshun National Meteorological Station, and the NECP1*1 every-6-hour reanalysis data, we analyzed the relationship between PM_(2.5)concentration and weather situation, meteorological elements and atmospheric conditions during 8 PM_(2.5)pollution lasting for 2 days in Anshun from 2017 to 2018.The results showed that:(1)PM_(2.5)pollution lasting for 2 days mostly occurred in autumn and winter, and there was no precipitation or weak precipitation during the pollution;(2)the stronger and thicker the inversion layer was, the more conducive to the increase of PM_(2.5)concentration it would be;the longer the inversion lasted, the longer the high PM_(2.5)concentration would be maintained;(3)there was significant correlation between relative humidity, temperature dew point difference, 0 to 3 km vertical wind shear, 0 to 6 km vertical wind shear and PM_(2.5)concentration, and PM_(2.5)concentration was positively correlated with vertical wind shear;(4)when the atmospheric temperature of the whole layer rose, it was conducive to the diffusion of PM_(2.5),and when the wind speed below 700 hPa was less than 4 m/s, it was conducive to the accumulation of PM_(2.5).

关 键 词：空气污染 垂直风切变 PM_(2.5) 相关性 

分 类 号：P4[天文地球—大气科学及气象学] X1[环境科学与工程—环境科学]