Global airborne sampling reveals a previously unobserved dimethyl sulfide oxidation mechanism in the marine atmosphere
103008 Experimental physics
SDG 14 – Leben unter Wasser
103008 Experimentalphysik
103039 Aerosol physics
01 natural sciences
Atmospheric Sciences
Climate Action
marine aerosols
autoxidation
13. Climate action
103037 Environmental physics
SDG 13 – Maßnahmen zum Klimaschutz
Earth Sciences
SDG 13 - Climate Action
SDG 14 - Life Below Water
14. Life underwater
marine sulfur
103039 Aerosolphysik
dimethyl sulfide
aerosol sulfate
103037 Umweltphysik
0105 earth and related environmental sciences
DOI:
10.1073/pnas.1919344117
Publication Date:
2020-02-18T23:14:27Z
AUTHORS (42)
ABSTRACT
Dimethyl sulfide (DMS), emitted from the oceans, is the most abundant biological source of sulfur to the marine atmosphere. Atmospheric DMS is oxidized to condensable products that form secondary aerosols that affect Earth’s radiative balance by scattering solar radiation and serving as cloud condensation nuclei. We report the atmospheric discovery of a previously unquantified DMS oxidation product, hydroperoxymethyl thioformate (HPMTF, HOOCH2SCHO), identified through global-scale airborne observations that demonstrate it to be a major reservoir of marine sulfur. Observationally constrained model results show that more than 30% of oceanic DMS emitted to the atmosphere forms HPMTF. Coincident particle measurements suggest a strong link between HPMTF concentration and new particle formation and growth. Analyses of these observations show that HPMTF chemistry must be included in atmospheric models to improve representation of key linkages between the biogeochemistry of the ocean, marine aerosol formation and growth, and their combined effects on climate.
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