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| Titel |
On the relation between Meridional Overturning Circulation and sea-level gradients in the Atlantic |
| VerfasserIn |
H. Kienert, S. Rahmstorf |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 3, no. 2 ; Nr. 3, no. 2 (2012-09-24), S.109-120 |
| Datensatznummer |
250001003
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| Publikation (Nr.) |
 copernicus.org/esd-3-109-2012.pdf |
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| Zusammenfassung |
| On the basis of model simulations, we examine what information on changes in
the strength of the Atlantic Meridional Overturning Circulation (AMOC) can be
extracted from associated changes in sea surface height (SSH), specifically
from a broad Atlantic north–south gradient as has been suggested previously
in the literature. Since a relation between AMOC and SSH changes can only be
used as an AMOC diagnostic if it is valid independently of the specific
forcing, we consider three different forcing types: increase of CO2
concentration, freshwater fluxes to the northern convection sites and the
modification of Southern Ocean winds. We concentrate on a timescale of
100 yr. We find approximately linear and numerically similar relations
between a sea-level difference within the Atlantic and the AMOC for
freshwater as well as wind forcing. However, the relation is more complex in
response to atmospheric CO2 increase, which precludes this sea-level
difference as an AMOC diagnostic under climate change. Finally, we show
qualitatively to what extent changes in SSH and AMOC strength, which are caused
by simultaneous application of different forcings, correspond to the sum of
the changes due to the individual forcings, a potential prerequisite for more
complex SSH-based AMOC diagnostics. |
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