A new marine biogenic emission: methane sulfonamide (MSAM), dimethyl sulfide (DMS), and dimethyl sulfone (DMSO<sub>2</sub>) measured in air over the Arabian Sea-Reference-Cited by-同舟云学术

A new marine biogenic emission: methane sulfonamide (MSAM), dimethyl sulfide (DMS), and dimethyl sulfone (DMSO<sub>2</sub>) measured in air over the Arabian Sea

Published:2020-05-25 Issue:10 Volume:20 Page:6081-6094
ISSN:1680-7324
Container-title:Atmospheric Chemistry and Physics
language:en
Short-container-title:Atmos. Chem. Phys.

Author:

Edtbauer Achim,Stönner Christof^ORCID,Pfannerstill Eva Y.^ORCID,Berasategui Matias,Walter David^ORCID,Crowley John N.^ORCID,Lelieveld Jos^ORCID,Williams Jonathan

Abstract

Abstract. We present the first ambient measurements of a new marine emission methane sulfonamide (MSAM: CH5NO2S), along with dimethyl sulfide (DMS) and dimethyl sulfone (DMSO2) over the Arabian Sea. Two shipborne transects (W → E, E → W) were made during the AQABA (Air Quality and Climate Change in the Arabian Basin) measurement campaign. Molar mixing ratios in picomole of species per mole of air (throughout this paper abbreviated as ppt) of DMS were in the range of 300–500 ppt during the first traverse of the Arabian Sea (first leg) and 100–300 ppt on the second leg. On the first leg DMSO2 was always below 40 ppt and MSAM was close to the limit of detection. During the second leg DMSO2 was between 40 and 120 ppt and MSAM was mostly in the range of 20–50 ppt with maximum values of 60 ppt. An analysis of HYSPLIT back trajectories combined with calculations of the exposure of these trajectories to underlying chlorophyll in the surface water revealed that most MSAM originates from the Somalia upwelling region, known for its high biological activity. MSAM emissions can be as high as one-third of DMS emissions over the upwelling region. This new marine emission is of particular interest as it contains both sulfur and nitrogen, making it potentially relevant to marine nutrient cycling and marine atmospheric particle formation.

Publisher

Copernicus GmbH

Subject

Atmospheric Science

Link

https://acp.copernicus.org/articles/20/6081/2020/acp-20-6081-2020.pdf

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