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| Titel |
Water isotope variations in the global ocean model MPI-OM |
| VerfasserIn |
X. Xu, M. Werner, M. Butzin, G. Lohmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 3 ; Nr. 5, no. 3 (2012-06-05), S.809-818 |
| Datensatznummer |
250002618
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| Publikation (Nr.) |
 copernicus.org/gmd-5-809-2012.pdf |
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| Zusammenfassung |
| The stable water isotopes H218O and HDO are incorporated as
passive tracers into the oceanic general circulation model MPI-OM, and a
control simulation under present-day climate conditions is analyzed in
detail. Both δ18O and δD distributions at the ocean
surface and deep ocean are generally consistent with available observations
on the large scale. The modelled δD-δ 18O relations in
surface waters slightly deviates from the slope of the global meteoric water
line in most basins, and a much steeper slope is detected in Arctic Oceans.
The simulated deuterium excess of ocean surface waters shows small
variations between 80° S and 55° N, and a strong decrease north of
55° N. The model is also able to capture the quasi-linear relationship
between δ18O and salinity S, as well as δD and S, as
seen in observational data. Both in the model results and observations, the
surface δ−S relations show a steeper slope in extra-tropical regions
than in tropical regions, which indicates relatively more addition of
isotopically depleted water at high latitudes. |
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