Significant contribution of lightning NO to summertime surface O3 on the Tibetan Plateau
Significant contribution of lightning NO to summertime surface O3 on the Tibetan Plateau
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闪电NO对青藏高原夏季地表O3的显着贡献
DOI：
10.1016/j.scitotenv.2022.154639
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发表时间：
2022
影响因子：
9.8
通讯作者：
Pengfei Yu
中科院分区：
文献类型：
--
作者：
Minglu Li;Jingying Mao;Shuqing Chen;Jianchun Bian;Zhixuan Bai;Xuemei Wang;Weihua Chen;Pengfei Yu
闪电在对流层产生氮氧化物（NOx），这是对流层臭氧（O3）的重要前体。然而，观测到的夏季TP表面臭氧浓度比高污染地区（如中国南方）高25%。先前的研究表明，闪电产生的氮氧化物（LNOx）可以影响表面O3的浓度。我们利用气象研究与预报耦合化学（WRF-Chem）模式，结合卫星、地面和航空观测，评估了lnox对TP地表o3收支的贡献。结果表明，在夏季，lnox贡献了TP上约15%的表面nox排放。因此，lnox对夏季地表最大8 h平均值（MDA8） O3的贡献为9.3±7.1 ppb，占地表MDA8 O3总浓度的17.5%±14.5%。此外，我们的研究发现，每次闪电产生的NO的摩尔数（lnox产生效率）显著影响NOx、OH和mda8o3的表面浓度。将lnox生成效率（PE）从0 mol NO flash - 1提高到330 mol NO flash - 1，可使TP上的mda8o3浓度提高20%。我们的研究表明，闪电对TP上涉及o3的大气化学过程有显著影响。
Lightning generates nitrogen oxides (NOx) in the troposphere, an important precursor of tropospheric ozone (O3). The Tibetan Plateau (TP) is considered to be a global atmospheric background location with limited anthropogenic influences. However, the observed summertime surface O3concentration on the TP is 25% higher than that in highly polluted regions (e.g., southern China). Previous studies have suggested that lightning-produced NOx(LNOx) can affect the concentration of surface O3. We used the Weather Research and Forecasting coupled with chemistry (WRF-Chem) model combined with satellite, ground-based, and airborne observations to evaluate the contribution of LNOxto the surface O3budget on the TP. Our results showed that LNOxcontributed approximately 15% of the surface NOxemission on the TP in summer. Accordingly, the contribution of LNOxto the summertime surface daily maximum 8-h average (MDA8) O3on the TP was 9.3 ± 7.1 ppb, which was 17.5% ± 14.5% of the total concentration of the surface MDA8 O3. In addition, our study found that the number of moles of NO produced per lightning flash (LNOxproduction efficiency) significantly affected the surface concentration of NOx, OH, and MDA8 O3. Increasing the LNOxproduction efficiency (PE) from 0 to 330 mol NO flash−1increased the concentration of MDA8 O3by up to 20% on the TP. Our study revealed that lightning significantly affects the atmospheric chemical processes involving O3on the TP.