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| Titel |
Can sparse proxy data constrain the strength of the Atlantic meridional overturning circulation? |
| VerfasserIn |
T. Kurahashi-Nakamura, M. Losch, A. Paul |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2014-02-26), S.419-432 |
| Datensatznummer |
250115550
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| Publikation (Nr.) |
 copernicus.org/gmd-7-419-2014.pdf |
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| Zusammenfassung |
| In a feasibility study, the potential of proxy data for the temperature and
salinity during the Last Glacial Maximum (LGM, about 19 000 to
23 000 years before
present) in constraining the strength of the Atlantic meridional overturning
circulation (AMOC) with a general ocean circulation model was explored. The
proxy data were simulated by drawing data from four different model
simulations at the ocean sediment core locations of the Multiproxy Approach
for the Reconstruction of the Glacial Ocean surface (MARGO) project, and
perturbing these data with realistic noise estimates. The results suggest
that our method has the potential to provide estimates of the past strength
of the AMOC even from sparse data, but in general, paleo-sea-surface
temperature data without additional prior knowledge about the ocean state
during the LGM is not adequate to constrain the model. On the one hand,
additional data in the deep-ocean and salinity data are shown to be highly
important in estimating the LGM circulation. On the other hand, increasing
the amount of surface data alone does not appear to be enough for better
estimates. Finally, better initial guesses to start the state estimation
procedure would greatly improve the performance of the method. Indeed, with
a sufficiently good first guess, just the sea-surface temperature data from
the MARGO project promise to be sufficient for reliable estimates of the
strength of the AMOC. |
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