Formation mechanism of HCHO pollution in the suburban Yangtze River Delta region, China: A box model study and policy implementations
Formation mechanism of HCHO pollution in the suburban Yangtze River Delta region, China: A box model study and policy implementations
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中国长三角郊区HCHO污染形成机制：箱体模型研究与政策实施
DOI：
10.1016/j.atmosenv.2021.118755
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发表时间：
2021-12
影响因子：
5
通讯作者：
Li Li
中科院分区：
文献类型：
--
作者：
Kun Zhang;Yusen Duan;Juntao Huo;Ling Huang;Yangjun Wang;Qingyan Fu;Yuhang Wang;Li Li
在人口稠密、发展迅速的中国长江三角洲地区，春夏季节经常检测到高浓度的甲醛（HCHO）。然而，HCHO污染的详细形成机制仍不清楚。基于对位于长三角郊区的超级站淀山湖（DSL）站进行的综合现场调查，分析了VOCs对HCHO形成的影响，以及HCHO在ROx自由基回收中的作用。结果表明，HCHO污染过程中最大大气氧化能力（AOC）范围为0.65×108到1.29×108分子cm−3s−1，高AOC值有利于HCHO的二次形成。同时，HCHO的光解占初级ROx的21.2%，表明HCHO在ROx回收中的重要作用。异戊二烯被认为是 HCHO 的关键前体，来自异戊二烯的 RO 占日间 HCHO 总产率 (PHCHO) 的约 15%。灵敏度分析表明，当切断异戊二烯、二甲苯或乙烯时，模拟的甲醛浓度可分别降低50%、15%或13%。根据不同VOCs/NOx还原比下的HCHO等值线，我们发现VOCs/NOx还原比应在1.03以上才能减轻HCHO污染。应减少反应性挥发性有机物（如异戊二烯、二甲苯和烯烃），以抑制长三角地区的甲醛污染。
High levels of formaldehyde (HCHO) have been frequently detected during spring-summertime in the densely populated and rapidly developing Yangtze River Delta (YRD) region, China. However, the detailed formation mechanism of HCHO pollution remains unclear. Based on a comprehensive field campaign conducted at Dianshan Lake (DSL) station, a supersite located in the suburban YRD region, the influence of VOCs on HCHO formation, as well as the role of HCHO in the ROxradical recycling was analyzed. Results indicate that the maximum atmospheric oxidation capability (AOC) during HCHO pollution episodes varies from 0.65 × 108to 1.29 × 108molecules cm−3s−1, and high AOC value favors the secondary formation of HCHO. Meanwhile, the photolysis of HCHO accounts for 21.2% of the primary ROx, suggesting the significant role of HCHO in ROxrecycling. Isoprene was identified to be a key precursor of HCHO, and the RO from isoprene contributed ∼15% to the total daytime HCHO production rate (PHCHO). Sensitivity analysis reveal that when isoprene, xylene or ethylene was cut off, the simulated HCHO concentration could be reduced by 50%, 15%, or 13%, respectively. Based on the isopleth of HCHO under different VOCs/NOxreduction ratios, we found that the VOCs/NOxreduction ratio should be above 1.03 to mitigate the HCHO pollution. Reactive VOCs (such as isoprene, xylene and alkenes) should be reduced to suppress HCHO pollution in the YRD region.
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影响因子：
6.3
作者：
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影响因子：
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作者：
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