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

Horowitz, Hannah M.; Holmes, Christopher; Wright, Alicia; Sherwen, Tomás; Wang, Xuan; Evans, Mat; Huang, Jiayue; Jaeglé, Lyatt; Chen, Qianjie; Zhai, Shuting; Alexander, Becky

doi:10.1029/2019gl085838

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

2020
By Horowitz, Hannah M. ; Holmes, Christopher ; Wright, Alicia ; ...
Source: Geophysical Research Letters, 47(4)

[PDF-2.37 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Horowitz, Hannah M. ; Holmes, Christopher ; Wright, Alicia ; Sherwen, Tomás ; Wang, Xuan ; ... More +

Horowitz, Hannah M. ; Holmes, Christopher ; Wright, Alicia ; Sherwen, Tomás ; Wang, Xuan ; Evans, Mat ; Huang, Jiayue ; Jaeglé, Lyatt ; Chen, Qianjie ; Zhai, Shuting ; Alexander, Becky Less -
NOAA Program & Office:

JISAO (Joint Institute for the Study of the Atmosphere and Ocean)
Description:

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 (Cly) and bromine (Bry). 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 (~2%) but may have potential implications for surface ozone pollution in tropical coastal regions.
Keywords:

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General Earth And Planetary Sciences Geophysics
Source:

Geophysical Research Letters, 47(4)
DOI:

https://doi.org/10.1029/2019gl085838
ISSN:

0094-8276;1944-8007;
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc-nd/4.0/
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CC BY-NC-ND
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Library
Main Document Checksum:

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urn:sha256:d75760768252459ef741cb210dc5906a13873b993753d64c69a5771798f44362
Download URL:

https://repository.library.noaa.gov/view/noaa/59314/noaa_59314_DS1.pdf
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