The influence of air-sea fluxes on atmospheric aerosols during the summer monsoon over the tropical Indian Ocean.

Zavarsky, Alexander , Booge, Dennis, Fiehn, Alina, Krüger, Kirstin, Atlas, Elliot and Marandino, Christa A. (2018) The influence of air-sea fluxes on atmospheric aerosols during the summer monsoon over the tropical Indian Ocean. Open Access Geophysical Research Letters, 45 (1). pp. 418-426. DOI 10.1002/2017GL076410.

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Abstract

During the summer monsoon, the western tropical Indian Ocean is predicted to be a hot spot for dimethylsulfide emissions, the major marine sulfur source to the atmosphere, and an important aerosol precursor. Other aerosol relevant fluxes, such as isoprene and sea spray, should also be enhanced, due to the steady strong winds during the monsoon. Marine air masses dominate the area during the summer monsoon, excluding the influence of continentally derived pollutants. During the SO234-2/235 cruise in the western tropical Indian Ocean from July to August 2014, directly measured eddy covariance DMS fluxes confirm that the area is a large source of sulfur to the atmosphere (cruise average 9.1 μmol m−2 d−1). The directly measured fluxes, as well as computed isoprene and sea spray fluxes, were combined with FLEXPART backward and forward trajectories to track the emissions in space and time. The fluxes show a significant positive correlation with aerosol data from the Terra and Suomi-NPP satellites, indicating a local influence of marine emissions on atmospheric aerosol numbers.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/603557
Keywords: gas transfer; eddy covariance; Indian Ocean; CCN; aerosol; DMS
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017GL076410
ISSN: 0094-8276
Projects: StratoClim
Expeditions/Models/Experiments:
Date Deposited: 09 Jan 2018 14:24
Last Modified: 27 May 2019 09:19
URI: http://oceanrep.geomar.de/id/eprint/41343

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