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| Titel |
Dimethylsulphide (DMS) emissions from the western Pacific Ocean: a potential marine source for stratospheric sulphur? |
| VerfasserIn |
C. A. Marandino, S. Tegtmeier, K. Krüger, C. Zindler, E. L. Atlas, F. Moore, H. W. Bange |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 16 ; Nr. 13, no. 16 (2013-08-26), S.8427-8437 |
| Datensatznummer |
250085650
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| Publikation (Nr.) |
 copernicus.org/acp-13-8427-2013.pdf |
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| Zusammenfassung |
| 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. |
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