Anthropogenic Impacts on Tropospheric Reactive Chlorine Since the Preindustrial
Anthropogenic Impacts on Tropospheric Reactive Chlorine Since the Preindustrial
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DOI：
10.1029/2021gl093808
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发表时间：
2021-07
影响因子：
5.2
通讯作者：
S. Zhai;Xuan Wang;J. McConnell;L. Geng;J. Cole‐Dai;M. Sigl;N. Chellman;T. Sherwen;R. Pound-R.-Pou
中科院分区：
文献类型：
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作者：
S. Zhai;Xuan Wang;J. McConnell;L. Geng;J. Cole‐Dai;M. Sigl;N. Chellman;T. Sherwen;R. Pound-R.-Pou
对流层活性气态氯（Cly）影响大气的氧化能力，并对甲烷等化学还原气体产生影响。在这里，我们使用格陵兰冰芯的氯，钠和酸度记录，以及全球模型模拟来显示对流层Cly自20世纪40年代以来如何受到人为排放的影响。我们发现，非海盐氯的人为贡献显着影响总氯及其在20世纪40年代后的趋势。从工业化前到20世纪70年代，模拟的区域170%Cly增加是由海盐气溶胶的酸置换、燃烧中盐酸（HCl）的直接排放以及人为氮氧化物（NOx）排放驱动的化学反应驱动的。自20世纪70年代以来，模拟的6%Cly下降主要是由于空气污染缓解政策减少了人为HCl排放。我们的研究结果表明，人为排放的酸性气体及其排放控制策略有重大影响的对流层氧化剂，甲烷和汞的影响。
Tropospheric reactive gaseous chlorine (Cly) impacts the atmosphere's oxidation capacity with implications for chemically reduced gases such as methane. Here we use Greenland ice‐core records of chlorine, sodium, and acidity, and global model simulations to show how tropospheric Cly has been impacted by anthropogenic emissions since the 1940s. We show that anthropogenic contribution of nonsea‐salt chlorine significantly influenced total chlorine and its trends after the 1940s. The modeled regional 170% Cly increase from preindustrial to the 1970s was driven by acid displacement from sea‐salt‐aerosol, direct emission of hydrochloric acid (HCl) from combustion, and chemical reactions driven by anthropogenic nitrogen oxide (NOx) emissions. Since the 1970s, the modeled 6% Cly decrease was caused mainly by reduced anthropogenic HCl emissions from air pollution mitigation policies. Our findings suggest that anthropogenic emissions of acidic gases and their emission control strategies have substantial impacts on Cly with implications for tropospheric oxidants, methane, and mercury.