基于过程分析的京津冀地区气象条件变化对PM_(2.5)浓度改善的影响  

Impact of Change in Meteorological Conditions on PM_(2.5) Air Quality Improvement in Beijing-Tianjin-Hebei Region Using Process Analysis

作　　者：张国斌 曹靖原 邱雄辉 彭林 ZHANG Guo-bin;CAO Jing-yuan;QIU Xiong-hui;PENG Lin(Key Laboratory of Resources and Environmental System Optimization,Ministry of Education,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China;Engineering Research Center of Clean and Low-carbon Technology for Intelligent Transportation,Ministry of Education,School of the Environment,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]华北电力大学环境科学与工程学院,资源环境系统优化教育部重点实验室,北京102206 [2]北京大学环境科学与工程学院,北京100871 [3]北京交通大学环境学院,智能交通绿色低碳技术教育部工程研究中心,北京100044

出　　处：《环境科学》2024年第11期6219-6228,共10页Environmental Science

基　　金：中央高校基本科研业务费专项(2023JBRC002);国家自然科学基金项目(22106043,42273086)。

摘　　要：自2013年以来,由于大气污染防治行动计划的实施,中国空气质量得到显著改善.气象条件的变化对空气质量改善的作用十分复杂,包括影响空气污染物的排放、输送、扩散和化学转化等过程,已有研究单纯评估气象条件影响,其影响机制不清.基于WRF-CMAQ模型及过程分析(PA)工具,评估了2013~2020年气象要素变化对京津冀地区PM_(2.5)浓度改善的影响,并进一步分析了气象条件对于大气污染物在传输、扩散和转化过程中的作用,为深入认识我国环境空气质量改善提供了技术支撑.结果表明,2013~2017年气象因素使得ρ(PM_(2.5))降低5.4μg·m^(-3),2017~2020年使ρ(PM_(2.5))升高11.6μg·m^(-3).2013~2017年,气溶胶化学过程、垂直传输和水平传输过程,是影响PM_(2.5)的主要过程;2017~2020年,主要受到气溶胶化学过程、水平传输和垂直传输影响.The air quality has significantly improved since the implementation of the Air Pollution Prevention and Control Action Plan in 2013.The effect of meteorological conditions on air quality improvement is complex,including affecting the emission,transport,diffusion,chemical transformation,and other processes of air pollutants.Based on the WRF-CMAQ model and process analysis(PA)tool,this study evaluates the impact of meteorological factor changes on the improvement of PM_(2.5) concentration in the Beijing-Tianjin-Hebei Region from 2013 to 2020 and further analyzes the role of meteorological conditions on the diffusion,transport,and transformation of atmospheric pollutants.The results provided the technical support for improving air quality in China.The changed meteorological conditions resulted in the PM_(2.5) concentration decreasing by 5.4μg·m^(-3)during the 2013-2017 period and increasing by 11.6μg·m^(-3)from 2017-2020.From 2013 to 2017,aerosol chemical processes,vertical transmission,and horizontal transmission processes were the main processes affecting the PM_(2.5) improvement.Conversely,the change in meteorological conditions contributed little to the reduction of PM_(2.5) level,which is mainly affected by aerosol chemical processes,horizontal transmission,and vertical transmission.

关 键 词：京津冀 PM_(2.5) WRF-CMAQ模型 气象条件 过程分析 

分 类 号：X513[环境科学与工程—环境工程]