 |
| Titel |
DMS cycle in the marine ocean-atmosphere system – a global model study |
| VerfasserIn |
S. Kloster, J. Feichter, E. Maier-Reimer, K. D. Six, P. Stier, P. Wetzel |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 3, no. 1 ; Nr. 3, no. 1 (2006-01-11), S.29-51 |
| Datensatznummer |
250000729
|
| Publikation (Nr.) |
 copernicus.org/bg-3-29-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
A global coupled ocean-atmosphere modeling system is established to study the
production of dimethylsulfide (DMS) in the ocean, the DMS flux to the
atmosphere, and the resulting sulfur concentrations in the atmosphere. The
DMS production and consumption processes in the ocean are simulated in the
marine biogeochemistry model HAMOCC5, embedded in a ocean general circulation
model (MPI-OM). The atmospheric model ECHAM5 is extended by the microphysical
aerosol model HAM, treating the sulfur chemistry in the atmosphere and the
evolution of the microphysically interacting internally- and externally mixed
aerosol populations.
We simulate a global annual mean DMS sea surface concentration of 1.8 nmol l−1,
a DMS emission of 28 Tg(S) yr−1, a DMS burden
in the atmosphere of 0.077 Tg(S), and a DMS lifetime of 1.0 days. To quantify
the role of DMS in the atmospheric sulfur cycle we simulate the relative
contribution of DMS-derived SO2 and SO42− to the total atmospheric sulfur
concentrations. DMS contributes 25% to the global annually averaged
SO2 column burden. For SO42− the contribution is 27%.
The coupled model setup allows the evaluation of the simulated DMS quantities
with measurements taken in the ocean and in the atmosphere. The simulated
global distribution of DMS sea surface concentrations compares reasonably
well with measurements. The comparison to SO42− surface concentration
measurements in regions with a high DMS contribution to SO42− shows an
overestimation by the model. This overestimation is most pronounced in the
biologically active season with high DMS emissions and most likely caused by
a too high simulated SO42− yield from DMS oxidation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|