高溫熱浪下江蘇省典型臭氧污染過程的特征及成因分析

doi:10.12306/2022jms.0087

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高溫熱浪下江蘇省典型臭氧污染過程的特征及成因分析
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                        10.12306/2022jms.0087
                    
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中圖分類號:X51
基金項目:國家重點研發(fā)計劃項目(2022YFE0106600);國家自然科學(xué)基金資助項目(41505059;41775074);江蘇省環(huán)境監(jiān)測科研基金項目(2111);江蘇省PM2.5與臭氧協(xié)同控制重大專項(2019023)

Characteristics and mechanisms of typical ozone pollution episode during heat waves in Jiangsu Province

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基于環(huán)境空氣質(zhì)量監(jiān)測數(shù)據(jù),本文分析了2022年6月14—18日高溫熱浪期間江蘇省臭氧污染過程的時空變化特征,并結(jié)合天氣形勢、WRF-CMAQ模擬和典型城市大氣超級站揮發(fā)性有機物(VOCs)在線監(jiān)測數(shù)據(jù)進行了成因分析。結(jié)果表明:高溫熱浪期間,江蘇省13個地級城市臭氧污染超標率達96.9%,中度污染超標率為27.6%,臭氧日最大8 h(MDA8 O₃)峰值質(zhì)量濃度高達260.0 μg·m^-3。南通市、無錫市、蘇州市3個典型城市臭氧質(zhì)量濃度的日變化特征顯示,07—13時臭氧質(zhì)量濃度增長率在27.9%~46.7%,多個時段凈增量超過40.0 μg·m^-3。利用WRF-CMAQ模型對污染過程進行了數(shù)值模擬、過程分析和溯源分析。結(jié)果顯示,典型城市白天小時平均光化學(xué)貢獻在24.5~33.0 μg·m^-3之間,穩(wěn)定高值的光化學(xué)貢獻,疊加持續(xù)穩(wěn)定或突發(fā)的傳輸貢獻,導(dǎo)致此次高溫熱浪下臭氧質(zhì)量濃度爆發(fā)式升高,出現(xiàn)峰值污染。在偏南風(fēng)的影響下,省外污染源來自浙江省貢獻最高,在13.9%~33.8%,其中無錫市和蘇州市受浙江省外源影響較大。此外南通市大氣超級站VOCs在線監(jiān)測結(jié)果顯示,臭氧污染期間逐日VOCs體積分數(shù)在45.5×10^-9~83.6×10^-9之間,整體處于高值水平,臭氧生成潛勢(OFPs)貢獻排名前十的物種以烯烴和芳香烴物質(zhì)為主。

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Based on air monitoring data, this study analyzes characteristics of the ozone pollution episode during heat waves on June 14 to 18, 2022. Combined with synoptic situation, WRF-CMAQ model sensitivity experiments, and online monitoring data of Volatile Organic Compounds (VOCs) from urban atmospheric chemical super site, the study investigates mechanisms of the pollution episode. The results show that 96.9% of cities exceed O₃ pollution standards, 27.6% of cities exceed moderate standard, the peak of daily maximum 8-hour average O₃ (MDA8 O₃) reaches 260.0 μg·m^-3. The ozone concentration growth rate during 07∶00 BST-13∶00 BST in heavily polluted cities of Nantong, Wuxi and Suzhou ranges from 27.9%-46.7%, with net increasing of more than 40.0 μg·m^-3 in several hours. According to WRF-CMAQ simulation results, daytime photochemical contribution in typical city is between 24.5-33.0 μg·m^-3. Stable and high photochemical contribution, combined with continuous or sudden transport contribution, leads to rapid increase of ozone concentration and emergence of peak pollution during heat waves. Under mainly southerly wind, emission sources outside the province come from Zhejiang with the highest contribution, ranging from 13.9%-33.8%. Wuxi and Suzhou are the most severely affected cities by Zhejiang pollution transport. In addition, online VOCs monitoring data from Nantong Atmospheric chemical super site performs that daily VOCs volume fraction is between 45.5×10^-9-83.6×10^-9 during ozone pollution, at a high level overall. The top 10 species of OFPs contribution are mainly olefin and aromatic hydrocarbons.

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楚翠姣,梁進,孫旭光,鐘聲,房佳蓓,陸維青.高溫熱浪下江蘇省典型臭氧污染過程的特征及成因分析.氣象科學(xué),2022,42(6):742-753 CHU Cuijiao, LIANG Jin, SUN Xuguang, ZHONG Sheng, FANG Jiabei, LU Weiqing. Characteristics and mechanisms of typical ozone pollution episode during heat waves in Jiangsu Province. Journal of the Meteorological Sciences,2022,42(6):742-753

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收稿日期:2022-07-16
最后修改日期:2022-09-11
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在線發(fā)布日期: 2023-03-03
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