Marine emissions of methanethiol increase aerosol cooling in the Southern Ocean.

Autor: Wohl C; Department of Marine Biology and Oceanography, Institut de Ciències del Mar, CSIC, Barcelona, Catalonia, Spain.; Centre of Ocean and Atmospheric Sciences, University of East Anglia, Norwich, UK., Villamayor J; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, CSIC, Madrid, Spain., Galí M; Department of Marine Biology and Oceanography, Institut de Ciències del Mar, CSIC, Barcelona, Catalonia, Spain., Mahajan AS; Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, India., Fernández RP; Institute for Interdisciplinary Science (ICB), National Research Council (CONICET), FCEN-UNCuyo, Mendoza, Argentina., Cuevas CA; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, CSIC, Madrid, Spain., Bossolasco A; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, CSIC, Madrid, Spain.; Physics Institute of Northwest Argentina (INFINOA), National Research Council (CONICET), Tucumán, Argentina., Li Q; Environment Research Institute, Shandong University, Qingdao, China., Kettle AJ; Météo France, Lannion, France., Williams T; Old Dominion University, Norfolk, VA, USA., Sarda-Esteve R; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CNRS-CEA-UVSQ, IPSL, Gif sur Yvette, France.; Climate and Atmosphere Research Center (CARE-C), the Cyprus Institute, Nicosia, 2121, Cyprus., Gros V; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), CNRS-CEA-UVSQ, IPSL, Gif sur Yvette, France., Simó R; Department of Marine Biology and Oceanography, Institut de Ciències del Mar, CSIC, Barcelona, Catalonia, Spain., Saiz-Lopez A; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, CSIC, Madrid, Spain.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2024 Nov 29; Vol. 10 (48), pp. eadq2465. Date of Electronic Publication: 2024 Nov 27.
DOI: 10.1126/sciadv.adq2465
Abstrakt: Ocean-emitted dimethyl sulfide (DMS) is a major source of climate-cooling aerosols. However, most of the marine biogenic sulfur cycling is not routed to DMS but to methanethiol (MeSH), another volatile whose reactivity has hitherto hampered measurements. Therefore, the global emissions and climate impact of MeSH remain unexplored. We compiled a database of seawater MeSH concentrations, identified their statistical predictors, and produced monthly fields of global marine MeSH emissions adding to DMS emissions. Implemented into a global chemistry-climate model, MeSH emissions increase the sulfate aerosol burden by 30 to 70% over the Southern Ocean and enhance the aerosol cooling effect while depleting atmospheric oxidants and increasing DMS lifetime and transport. Accounting for MeSH emissions reduces the radiative bias of current climate models in this climatically relevant region.
Databáze: MEDLINE
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