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武汉市冬季重污染过程中PM2.5组分特征与区域来源解析
Analysis of PM2.5 Components and Regional Sources During a Heavy Winter Air Pollution Process in Wuhan
投稿时间:2022-12-14  修订日期:2023-06-17
DOI:10.19316/j.issn.1002-6002.2024.03.06
中文关键词:  PM2.5  污染过程  区域传输  武汉市
英文关键词:PM2.5  pollution process  regional transport  Wuhan
基金项目:国家自然科学基金资助项目(41875164)
作者单位
王健颖 成都信息工程大学大气科学学院, 四川 成都 610225
中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029 
唐晓* 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029 
陈科艺 成都信息工程大学大气科学学院, 四川 成都 610225 
胡柯 湖北省武汉市环境监测中心, 湖北 武汉 430015 
王瑶 贵州省台江县气象局, 贵州 台江 556300 
丁宁 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029 
韩雨阳 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029 
通讯作者:唐晓*  中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029  
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中文摘要:
      随着《大气污染防治行动计划》和《打赢蓝天保卫战三年行动计划》的相继实施,在高强度的污染治理下,中东部地区PM2.5污染改善效果显著。为探讨在PM2.5浓度不断降低的背景下,仍时有发生的武汉冬季重污染过程的成因及特征,以2020年12月武汉地区一次长达10 d的重污染过程为例,利用多种观测数据和嵌套网格空气质量预报模式系统(NAQPMS)分析污染过程中PM2.5的化学组分特征和区域贡献等。结果表明:污染日二次无机盐SNA (SO42-、NO3-和NH4+)和碳质组分(EC和OC)在PM2.5中的占比高(分别为78%和18%),NO3-的占比从清洁日的36%上升到污染日的46%,是污染过程中占比最高的化学组分。污染期间,NO3-和SO42-的浓度比为2.9~6.1,因此二次无机盐的主要来源可能是移动源;OC和EC的浓度比为3.0~9.8,因此碳质组分的主要来源可能是燃煤源。污染期间主要有河南-孝感-武汉和安徽-黄冈-武汉2条污染传输带,污染物传输以武汉周边城市的近距离输送为主,随着污染程度加重,武汉本地及武汉城市圈的区域贡献增加。重度污染天是静稳天气下持续的偏弱东风和西北风输送的污染气团在不易扩散的天气条件下累积形成的。
英文摘要:
      With the successive implementation of the Air Pollution Prevention and Control Action Plan and the Three-Year Action Plan to Fight Air Pollution,PM2.5 pollution in the central and eastern regions has been significantly improved under the intensive pollution control. In order to explore the causes and characteristics of the heavy pollution process that still happens occasionally in Wuhan in winter under the background of decreasing PM2.5 concentration,taking a 10 day heavy pollution process in Wuhan in December 2020 as an example,the chemical composition characteristics and regional contribution of fine particles in the pollution process are analyzed by using a variety of observation data and the Nested Air Quality Prediction Modeling System (NAQPMS). The results showed that the proportion of secondary inorganic salts SNA (SO42-, NO3- and NH4+) and carbonaceous components (EC and OC) in PM2.5 on the pollution day was high,respectively 78% and 18%; The proportion of NO3- increased from 36% on the clean day to 46% on the polluted day, which is the chemical component with the highest proportion of pollution process. During the pollution period,the concentration ratio of NO3- and SO42- is 2.9-6.1. Therefore,the main source of secondary inorganic salts may be mobile sources. The concentration ratio of OC and EC is 3.0-9.8. Therefore,the main source of carbon components may be coal-fired sources. During the pollution period,there are mainly two pollution transmission belts:Henan-Xiaogan-Wuhan and Anhui-Huanggang-Wuhan. The pollutant transmission is dominated by the short distance transport of the cities around Wuhan. With the aggravation of pollution, the regional contribution of Wuhan local and Wuhan city circle increases. The occurrence of severe pollution days is due to the accumulation of pollution air mass transported by continuous weak easterly and northwest winds under the weather conditions that are not easy to spread.
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