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| Titel |
The use of algorithms to predict surface seawater dimethyl sulphide concentrations in the SE Pacific, a region of steep gradients in primary productivity, biomass and mixed layer depth |
| VerfasserIn |
A. J. Hind, C. D. Rauschenberg, J. E. Johnson, M. Yang, P. A. Matrai |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 8, no. 1 ; Nr. 8, no. 1 (2011-01-03), S.1-16 |
| Datensatznummer |
250005341
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| Publikation (Nr.) |
 copernicus.org/bg-8-1-2011.pdf |
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| Zusammenfassung |
| Dimethyl sulphide (DMS) is an important precursor of cloud condensation
nuclei (CCN), particularly in the remote marine atmosphere. The SE Pacific
is consistently covered with a persistent stratocumulus layer that increases
the albedo over this large area. It is not certain whether the source of CCN
to these clouds is natural and oceanic or anthropogenic and terrestrial.
This unknown currently limits our ability to reliably model either the cloud
behaviour or the oceanic heat budget of the region. In order to better
constrain the marine source of CCN, it is necessary to have an improved
understanding of the sea-air flux of DMS. Of the factors that govern the
magnitude of this flux, the greatest unknown is the surface seawater DMS
concentration. In the study area, there is a paucity of such data, although
previous measurements suggest that the concentration can be substantially
variable. In order to overcome such data scarcity, a number of climatologies
and algorithms have been devised in the last decade to predict seawater DMS.
Here we test some of these in the SE Pacific by comparing predictions with
measurements of surface seawater made during the Vamos
Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx) in
October and November of 2008. We conclude that none of the existing
algorithms reproduce local variability in seawater DMS in this region very
well. From these findings, we recommend the best algorithm choice for the SE
Pacific and suggest lines of investigation for future work. |
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