Effects of Sea Salt Aerosol Emissions for Marine Cloud Brightening on Atmospheric Chemistry : Implications for Radiative Forcing
© 2020. The Authors.
| Veröffentlicht in: | Geophysical research letters. - 1984. - 47(2020), 4 vom: 28. Feb., Seite e2019GL085838 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2020
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| Zugriff auf das übergeordnete Werk: | Geophysical research letters |
| Schlagworte: | Journal Article atmospheric chemistry geoengineering marine cloud brightening reactive halogens sea salt aerosols |
| Zusammenfassung: | © 2020. The Authors. 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 Cl y and Br y 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 |
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| Beschreibung: | Date Revised 31.07.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 0094-8276 |
| DOI: | 10.1029/2019GL085838 |