广东省夏秋季光化学反应活性空间分布表征

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摘要于夏末秋初在深圳市城市和郊区开展了大气OH自由基观测,结果显示OH自由基日间峰值平均浓度分别为6.0×10⁶cm^-3和5.9×10⁶cm^-3,与国内外其他地区相比处于中等水平.基于实测数据构建了拟合效果较好的本地化OH自由基参数化公式,应用于广东省OH自由基空间分布的表征,并进一步利用日间OH和NO₂浓度之积反映光化学反应活性(AP).结果发现,2018年夏秋季广东省大气光化学反应活性总体上呈现珠江三角洲较高,AP达10.1×10⁷μg/(m³·cm³),粤东、粤西、粤北地区较低的分布态势,AP分别为5.4×10⁷, 5.9×10⁷和7.7×10⁷μg/(m³·cm³);同期的PM_2.5和O₃高值区域也集中在珠江三角洲,说明了调控光化学反应活性对珠江三角洲协同控制PM_2.5和O₃污染的关键作用.空间分布特征还表明,粤北地区显著受到来自北方内陆的PM_2.5区域传输影响,而粤东地区更易受到来自东南沿海的O₃区域传输影响,体现了跨省区域联防联控的重要性.

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	唐梦雪
	黄晓锋
	程勇
	林晓玉
	姚沛廷
	胡仁志
	邓涛
	何凌燕

关键词 ：光化学反应活性, OH自由基, 前体物, 臭氧(O₃), 细颗粒物(PM_2.5)

Abstract：OH radicals were observed at urban and rural sites in the late summer and early autumn in Shenzhen, China. The daytime peak average concentrations of OH radicals were 6.0×10⁶cm^-3 and 5.9×10⁶cm^-3, which were at a moderate level compared to other regions around the world. Based on the observed data, a parameterized formula of OH radicals, with good fitting, was constructed to characterize the spatial distribution of OH radicals in Guangdong Province. The activity of photochemistry (AP) was reflected by the product of daytime OH and NO₂ concentrations. Generally, higher AP (10.1×10⁷μg/(m³·cm³)) was found in the Pearl River Delta (PRD) and the lower AP in eastern, western and northern Guangdong (5.4×10⁷,5.9×10⁷ and 7.7×10⁷μg/(m³·cm³)). Higher concentrations of PM_2.5 and O₃ were also found in the PRD, indicating a key role of regulating AP in the coordinated control of PM_2.5 and O₃ pollution in the PRD. The spatial distribution characteristics also showed that northern Guangdong and eastern Guangdong were significantly affected by the regional transport of PM_2.5 from the northern inland and the regional transport of O₃ from the southeast coast, respectively, reflecting the importance of regional joint control to jointly mitigate PM_2.5 and O₃ pollution.

Key words： activity of photochemistry OH radical precursor ozone (O₃) fine particulate matter (PM_2.5)

收稿日期: 2022-06-09

PACS:

X513

基金资助:国家重点研发计划项目(2018YFC0213901);深圳市科技计划项目(JCYJ20200109110625819)

通讯作者: 何凌燕,教授,hely@pku.edu.cn E-mail: hely@pku.edu.cn

作者简介: 唐梦雪(1996-),女,安徽池州人,北京大学博士研究生,主要从事大气氧化性和二次污染物研究.发表论文6篇.

引用本文:

唐梦雪, 黄晓锋, 程勇, 林晓玉, 姚沛廷, 胡仁志, 邓涛, 何凌燕. 广东省夏秋季光化学反应活性空间分布表征[J]. 中国环境科学, 2023, 43(1): 1-6. TANG Meng-xue, HUANG Xiao-feng, CHENG yong, LIN Xiao-yu, YAO Pei-ting, HU Ren-zhi, DENG Tao, HE Ling-yan. Study on characterizing the spatial distribution of activity of photochemistry in summer and autumn in Guangdong Province, China. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 1-6.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I1/1

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