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| Titel |
Relationship between DMS concentration and the upper mixed layer solar radiation dose |
| VerfasserIn |
S. Belviso, G. Caniaux |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020618
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| Zusammenfassung |
| Dimethylsulfide (DMS) is a natural sulfur compound arising from algal
dimethylsulfoniopropionate (DMSP) but through complex biotic and abiotic
processes. It is an important natural source of atmospheric sulfur
providing new and/or bigger hygroscopic particles for cloud formation over
the ocean. One recent study (Vallina and Simo, Science, 2007) suggests
the existence of a close quantitative link, at the global scale but also
locally, between DMS and the solar radiation dose (SRD), a measure of
available radiation inside the mixed layer. Joint data including CTDs,
DMS concentration and solar radiation data, collected all along the
year 2001 in the northeastern Atlantic during the POMME experiment are
analyzed. Contrary to the observations in the Sargasso Sea and Blanes Bay
(Mediterranean Sea) presented by Vallina and Simo (2007), this new data
set clearly indicates that SRD and DMS are only weakly correlated, and
this whatever the numerous sensitivity tests performed (i.e. the solar
irradiance, the optical properties of surface waters, the mixed layer
depth criteria). Additionally, the DMS versus SRD relationship appears
quite sensitive to the irradiance attenuation law. Hence, it appears
that SRD cannot be used to understand DMS dynamics at the scale of the
north Atlantic basin. |
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