Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019GL085838 |
Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry: Implications for Radiative Forcing | |
Horowitz, Hannah M.1,2,3; Holmes, Christopher4; Wright, Alicia2; Sherwen, Tomas5,6; Wang, Xuan7,8; Evans, Mat5,6; Huang, Jiayue2; Jaegle, Lyatt2; Chen, Qianjie2,9; Zhai, Shuting2; Alexander, Becky2 | |
2020-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2020 |
卷号 | 47期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; England; Peoples R China |
英文摘要 | 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-y) and bromine (Br-y). 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 Cly and Bry 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 (similar to 2%) but may have potential implications for surface ozone pollution in tropical coastal regions. Plain Language Summary In light of global warming, hypothetical geoengineering methods have been proposed to try to counteract rising temperatures. One involves spraying sea salt particles into the air above the oceans in the tropics. This would reduce temperatures by reflecting sunlight away from the Earth. Sea salt particles can also release halogens to the air. Their resulting chemical reactions affect the amount of ozone and methane, both greenhouse gases, which may further impact temperatures. We investigate this for the first time using a computer model of the atmosphere and its chemistry. We find that additional sea salt for geoengineering would reduce ozone, especially at the surface where it is an air pollutant, while increasing methane. Overall, these results suggest that the net effect of the sea salt chemistry on the energy balance of the Earth is near zero, but it may have potential implications for air quality. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000529120100019 |
WOS关键词 | OZONE DESTRUCTION ; MODEL ; CONSTRAINTS ; TRANSPORT ; METHANE ; SURFACE ; ALBEDO ; DEPOSITION ; MECHANISM ; OXIDANTS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279693 |
专题 | 气候变化 |
作者单位 | 1.Univ Washington, JISAO, Seattle, WA 98195 USA; 2.Univ Washington, Dept Atmospher Sci, Seattle, WA 98195 USA; 3.Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA; 4.Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA; 5.Univ York, Dept Chem, York, N Yorkshire, England; 6.Univ York, Dept Chem, Wolfson Atmospher Chem Labs, York, N Yorkshire, England; 7.City Univ Hong Kong, Sch Energy & Environm, Hong Kong, Peoples R China; 8.Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA; 9.Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA |
推荐引用方式 GB/T 7714 | Horowitz, Hannah M.,Holmes, Christopher,Wright, Alicia,et al. Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry: Implications for Radiative Forcing[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(4). |
APA | Horowitz, Hannah M..,Holmes, Christopher.,Wright, Alicia.,Sherwen, Tomas.,Wang, Xuan.,...&Alexander, Becky.(2020).Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry: Implications for Radiative Forcing.GEOPHYSICAL RESEARCH LETTERS,47(4). |
MLA | Horowitz, Hannah M.,et al."Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry: Implications for Radiative Forcing".GEOPHYSICAL RESEARCH LETTERS 47.4(2020). |
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