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Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry: Implications for Radiative Forcing

机译:海盐气溶胶排放对海洋云的增亮对大气化学的影响:辐射强迫的意义。

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摘要

Marine cloud brightening (MCB) is proposed to offset global warming by emitting sea salt aerosols to the tropical marine boundary layer, which increases aerosol and cloud albedo. Sea salt aerosol is the main source of tropospheric reactive chlorine (Cl ) and bromine (Br ). The effects of additional sea salt on atmospheric chemistry have not been explored. We simulate sea salt aerosol injections for MCB under two scenarios (212–569 Tg/a) in the GEOS‐Chem global chemical transport model, only considering their impacts as a halogen source. Globally, tropospheric Cl and Br increase (20–40%), leading to decreased ozone (−3 to −6%). Consequently, OH decreases (−3 to −5%), which increases the methane lifetime (3–6%). Our results suggest that the chemistry of the additional sea salt leads to minor total radiative forcing compared to that of the sea salt aerosol itself (~2%) but may have potential implications for surface ozone pollution in tropical coastal regions.
机译:提出海洋云增亮(MCB)可以通过向热带海洋边界层排放海盐气溶胶来抵消全球变暖,这会增加气溶胶和云的反照率。海盐气溶胶是对流层反应性氯(Cl)和溴(Br)的主要来源。尚未探索额外的海盐对大气化学的影响。我们在GEOS-Chem全球化学传输模型中的两种情况下(212-569 Tg / a)模拟了MCB的海盐气溶胶注入,仅考虑了其作为卤素源的影响。在全球范围内,对流层的Cl和Br增加(20-40%),导致臭氧减少(-3至6%)。因此,OH降低(-3至-5%),从而延长了甲烷的寿命(3-6%)。我们的结果表明,与海盐气溶胶本身(〜2%)相比,其他海盐的化学成分导致总辐射强迫较小,但可能会对热带沿海地区的表面臭氧污染产生潜在影响。

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