宿迁市PM_(2.5)积累机制及重污染天气过程分析  

Accumulation Mechanism of PM_(2.5)and the Causes of Serious Pollution Weather in Suqian City,China

作　　者：刘玲 殷华 仲杰 王舒欣 LIU Ling;YIN Hua;ZHONG Jie;WANG Shuxin(Siyang County Meteorological Bureau,Suqian 223700,China;Suqian Municipal Meteorological Bureau,Suqian 223800,China)

机构地区：[1]泗阳县气象局,江苏宿迁223700 [2]宿迁市气象局,江苏宿迁223800

出　　处：《沙漠与绿洲气象》2024年第1期156-164,共9页Desert and Oasis Meteorology

基　　金：宿迁市自立科研项目(SQ202210);淮河流域气象开放研究基金(HRM201702)。

摘　　要：统计宿迁市2017—2021年秋冬季PM_(2.5)数据以及同期常规气象观测资料,基于PM_(2.5)日变化特征,根据15—23时的浓度变化将其分为快速积累、慢速积累、消散三种过程,从积累速率的角度分析宿迁市PM_(2.5)的积累特征,并将其应用于重污染天气过程下的环流形势与积累速率相关性的探讨。结果表明:发生快速积累过程的平均积累速率为7.14μg·m^(-3)·h^(-1);慢速积累过程平均积累速率为3.27μg·m^(-3)·h^(-1);发生消散过程的PM_(2.5)平均消散速率为5.42μg·m^(-3)·h^(-1)。PM_(2.5)慢速积累过程中气温高,风速大,湿度小,逆温强度弱,快速积累则与之相反。慢速积累过程的PM_(2.5)潜在源区主要位于苏北地区及山东、河北,快速积累过程的PM_(2.5)主要潜在源区则位于安徽、湖北地区。快速积累过程以高空槽后配地面高压前部型为主,慢速积累过程以纬向环流配合地面均压场为主。Through the statistics of PM_(2.5)data of Suqian in the autumn and winter of 2017-2021 and the conventional meteorological observation data of the same period,based on the daily variation characteristics of PM_(2.5),it is divided into three processes:rapid accumulation,slow accumulation and dissipation according to the concentration change from 15:00 to 23:00.The accumulation characteristics of PM_(2.5)in Suqian are analyzed from the perspective of the accumulation rate.It is also applied to study the correlation between circulation situation and accumulation rate under the process of heavy pollution weather.The results show that the average accumulation rate of PM_(2.5)in the rapid accumulation process is 7.14μg·m^(-3)·h^(-1);the average accumulation rate of PM_(2.5)in the slow accumulation process is 3.27μg·m^(-3)·h^(-1);the average dissipation rate of PM_(2.5)in the dissipation process is 5.42μg·m^(-3)·h^(-1).The slow accumulation of PM_(2.5)is characterized by high temperature,high wind speed,low humidity and weak inversion intensity,while the rapid accumulation is the opposite.The potential source areas of PM_(2.5)during the slow accumulation process are mainly located in northern Jiangsu,Shandong and Hebei,while the main potential source areas of PM_(2.5)during the fast accumulation process are mainly located in Anhui and Hubei.The fast accumulation process is dominated by the high altitude trough followed by the ground high-pressure front,and the slow accumulation process is dominated by the latitudinal circulation with the homogeneity surface pressure field.

关 键 词：PM_(2.5)积累速率 快速积累 慢速积累 消散 潜在源区 环流形势 

分 类 号：X51[环境科学与工程—环境工程]