银川2次PM_(2.5)重污染过程逆温及其影响因素分析  

Analysis of Inversion and Influencing Factors of Two PM_(2.5)Heavy Pollution Cases in Yinchuan

作　　者：邓敏君 张卫红 田林锋 顾驭程 左正艳 DENG Minjun;ZHANG Weihong;TIAN Linfeng;GU Yucheng;ZUO Zhengyan(Ningxia Hui Autonomous Region Meteorological Service Center,Yinchuan 750002,China;Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,CMA,Yinchuan 750002,China;Ningxia Key Laboratory of Meteorological Disaster Prevention and Reduction,Yinchuan 750002,China;Ecological Environment Monitoring Center of Ningxia Hui Autonomous Region,Yinchuan 750004,China;Ningxia Hui Autonomous Region Key Laboratory for Monitoring and Assessment of Water and Atmospheric Environment Quality,Yinchuan 750004,China)

机构地区：[1]宁夏回族自治区气象服务中心,宁夏银川750002 [2]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,宁夏银川750002 [3]宁夏气象防灾减灾重点实验室,宁夏银川750002 [4]宁夏回族自治区生态环境监测中心,宁夏银川750004 [5]宁夏回族自治区水生态与大气环境质量监测评估重点实验室,宁夏银川750004

出　　处：《环境科学与技术》2025年第3期55-66,共12页Environmental Science & Technology

基　　金：宁夏回族自治区水生态与大气环境质量监测评估重点实验室项目:边界层逆温对银川都市圈PM_(2.5)污染的影响及大气环境监测评估技术研究(2023ZDJS004);宁夏自然科学基金项目(2023AAC03795)。

摘　　要：文章选取银川市2020年和2022年1月2次典型PM_(2.5)重污染过程,利用探空和地面气象观测资料、空气污染监测数据及欧洲中心(ECMWF)第五代全球大气ERA5再分析资料,基于数理统计和流场分析等方法,对比分析2次过程积累、持续和清除阶段近地层逆温及风、相对湿度、混合层高度、垂直风切变、垂直速度等气象因子变化特征和高低空环流场配置特点。结果显示,2次过程最大逆温强度分别达3.6℃/hm和2.6℃/hm,逆温厚度达525 m和368 m,且存在多层逆温。地面至近地层小风、高湿、低混合层高度、偏南转偏西的垂直风切变,上升-下沉的垂直速度分布及不利于扩散的高低空环流场配置,是造成逆温维持加强进而导致银川市冬季PM_(2.5)重污染的主要原因。This paper selected two typical heavy air pollution cases of PM_(2.5)occurred in January 2020 and January 2022 respectively in Yinchuan as the objectives.By use of radiosonde measured and surface meteorological observation data,air pollution monitoring data and the fifth generation global atmospheric ERA5 reanalysis data from European Centre for Medium-Range Weather Forecasts(ECMWF),applying mathematical statistics and circulation analysis,the variation charac⁃teristics of near-ground inversion,wind,relative humidity,mixed layer height,vertical wind shear,vertical velocity and other meteorological factors as well as the characteristics of high and low air circulation field configuration were compared and analyzed in accumulation,persistence and removal stages of the two processes.Multi-layer inversions were found in analyzing the two cases,of which the strongest inversion intensity reached up to 3.6℃/hm and 2.6℃/hm respectively,and the largest inversion layer thickness reached up to 525 meters and 368 meters respectively.In addition,low speed,highest relative humidity,lowest mixed layer height,south to west wind shear and rise-subsidence distribution of vertical velocity from surface to lower atmosphere,overlay high and low air circulation field configuration which are not conducive to the diffusion of pollutants are the primary root causes of the maintenance and strengthen of inversion,resulting in the PM_(2.5)heavy pollution over Yinchuan City in winter.

关 键 词：银川市 PM_(2.5)重污染过程 逆温特征 气象因子 影响分析 

分 类 号：X513[环境科学与工程—环境工程]