Dimethylsulphide (DMS) emissions from the West Pacific Ocean: a potential marine source for the stratospheric sulphur layer.

Marandino, Christa, Tegtmeier, Susann, Krüger, Kirstin, Zindler, Cathleen , Atlas, E. L., Moore, F. and Bange, Hermann W. (2013) Dimethylsulphide (DMS) emissions from the West Pacific Ocean: a potential marine source for the stratospheric sulphur layer. Open Access Atmospheric Chemistry and Physics, 13 (16). pp. 8427-8437. DOI 10.5194/acp-13-8427-2013.

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Abstract

Sea surface and atmospheric measurements of dimethylsulphide (DMS) were performed during the TransBrom cruise in the western Pacific Ocean between Japan and Australia in October 2009. Air–sea DMS fluxes were computed between 0 and 30 μmol m−2 d−1, which are in agreement with those computed by the current climatology, and peak emissions of marine DMS into the atmosphere were found during the occurrence of tropical storm systems. Atmospheric variability in DMS, however, did not follow that of the computed fluxes and was more related to atmospheric transport processes. The computed emissions were used as input fields for the Lagrangian dispersion model FLEXPART, which was set up with actual meteorological fields from ERA-Interim data and different chemical lifetimes of DMS. A comparison with aircraft in situ data from the adjacent HIPPO2 campaign revealed an overall good agreement between modelled versus observed DMS profiles over the tropical western Pacific Ocean. Based on observed DMS emissions and meteorological fields along the cruise track, the model projected that up to 30 g S per month in the form of DMS, emitted from an area of 6 × 104 m2, can be transported above 17 km. This surprisingly large DMS entrainment into the stratosphere is disproportionate to the regional extent of the area of emissions and mainly due to the high convective activity in this region as simulated by the transport model. Thus, if DMS can cross the tropical tropopause layer (TTL), we suggest that the considerably larger area of the tropical western Pacific Ocean can be a source of sulphur to the stratosphere, which has not been considered as yet.

Document Type: Article
Additional Information: WOS:000323626500020 Achtung: 10.5194/acp-13-8813-2013 Corrigendum to "Dimethylsulphide (DMS) emissionsfrom the West Pacific Ocean: a potential marine source for stratospheric sulphur?" published in Atmos. Chem. Phys., 13, 8427–8437, 2013
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/acp-13-8427-2013
ISSN: 1680-7316
Projects: SOPRAN, DMS, TRANSBROM, SHIVA, Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 26 Nov 2012 14:01
Last Modified: 09 Jan 2014 11:37
URI: http://oceanrep.geomar.de/id/eprint/19316

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