NO3 and N2O5 chemistry at a suburban site during the EXPLORE-YRD campaign in 2018
NO3 and N2O5 chemistry at a suburban site during the EXPLORE-YRD campaign in 2018
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DOI：
10.1016/j.atmosenv.2019.117180
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发表时间：
2020-03
影响因子：
5
通讯作者：
Haichao Wang;Xiaorui Chen;K. Lu;Renzhi Hu;Zhi-yan Li;Hongli Wang;Xuefei Ma;Xinping Yang
中科院分区：
文献类型：
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作者：
Haichao Wang;Xiaorui Chen;K. Lu;Renzhi Hu;Zhi-yan Li;Hongli Wang;Xuefei Ma;Xinping Yang
在2018年5 - 6月的“长江三角洲地区大气氧化能力和气溶胶形成及其影响研究”（EXPLORE-YRD）活动中，我们在江苏省泰州市的一个区域站点测量了N2 O 5、NO2、O3等相关参数。夜间平均NO3产生速率为1.01 ± 0.47 ppbv h−1，但N2 O 5的混合比率较低，1分钟内最大值为220 pptv，表明NO3和N2 O 5的快速损失。N_2O_5的夜间稳态寿命平均为43 ± 52 s，这可能与单萜含量增加和N_2O_5吸收快有关。NO3的日损失以VOCs为主，占36.4%，N2 O 5的日吸收占14.4%。结果表明，在长江三角洲地区，白天单萜的NO3氧化作用是不可忽视的，它有助于白天有机硝酸盐和二次有机气溶胶的形成。通过快速NO3反应的日平均NOx消耗率达到0.63 ppbv h−1，与该站点的OH氧化途径相比，相当于57.3%的NOx损失，突出了NO3和N2 O 5在YRD区域的NOx去除和随后的光化学中的关键作用。
During the EXPLORE-YRD campaign (EXPeriment on the eLucidation of the atmospheric Oxidation capacity and aerosol foRmation, and their Effects in Yangtze River Delta) in May–June 2018, we measured N2O5, NO2, O3and relevant parameters at a regional site in Taizhou, Jiangsu Province. The nocturnal average NO3production rate was 1.01 ± 0.47 ppbv h−1, but the mixing ratio of N2O5was low, with a maximum of 220 pptv in 1 min, suggesting rapid loss of NO3and N2O5. The nocturnal steady-state lifetime of N2O5was 43 ± 52 s on average, which may be attributed to the elevated monoterpene and fast N2O5uptake. VOCs (mainly monoterpenes) dominated daily NO3loss with the percentage of 36.4% and N2O5uptake accounted for 14.4%, when taking NO + NO3and NO3photolysis into consideration. We demonstrated that the nonnegligible daytime NO3oxidation of monoterpene in YRD region, which contributes to the daytime formation of organic nitrate and secondary organic aerosol. The daily average NOxconsumption rate via rapid NO3reaction reached 0.63 ppbv h−1, corresponding to 57.3% NOxloss in comparison with the OH oxidation pathway at this site, highlighting the key role of NO3and N2O5in NOxremoval and subsequent photochemistry in the YRD region.