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| Titel |
Simulated Southern Ocean response to forcing with climate model output |
| VerfasserIn |
Ralph Timmermann, Hartmut H. Hellmer, Frank Kauker |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250054633
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| Zusammenfassung |
| In the framework of the EU-funded project ICE2SEA (Contribution of Land Ice to Sea Level
Rise) we forced a regional (south of 50°S) coupled sea ice—ice shelf—ocean model with the
atmospheric output from the climate models HadCM3 (MOHC) and MPEH5C
(MPI-Hamburg). The skills of the climate models with regard to conditions in the
Southern Ocean were investigated by comparing the results from three regional model
simulations, two forced with the 20th-century climate model outputs, the other with NCEP
reanalysis products. The comparison shows significant differences in Southern Ocean
hydrography and sea ice characteristics, and thus allows for an identification of the most
suitable climate scenario forcing product. We found that using MPEH5C output
causes maximum temperatures on the southeast Pacific continental shelf being
too high and too variable in time, and sea ice extent being too large for the whole
Southern Ocean. The analysis of the climate models’ atmospheric outputs indicates the
reasons for the diverse responses. Representation of the ENSO signal, e. g., is much
more pronounced in MPEH5C, while inter-decadal variability in the 20th-century
appears to be underestimated when using the HadCM3 product. In view of the
differences between the climate model projections, we also present results from
the regional model forced with the climate change scenario A1B for the period
2000-2100. |
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