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| Titel |
Can oceanic paleothermometers reconstruct the Atlantic Multidecadal Oscillation? |
| VerfasserIn |
D. Heslop, A. Paul |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 7, no. 1 ; Nr. 7, no. 1 (2011-03-02), S.151-159 |
| Datensatznummer |
250004403
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| Publikation (Nr.) |
 copernicus.org/cp-7-151-2011.pdf |
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| Zusammenfassung |
| Instrumental records of the North Atlantic sea surface temperature reveal a
large-scale low frequency mode of variability that has become known as the
Atlantic Multidecadal Oscillation (AMO). Proxy and modelling studies have
demonstrated the important consequences of the AMO on other components of the
climate system both within and outside the Atlantic region. Over longer time
scales, the past behavior of the AMO is predominantly constrained by
terrestrial proxies and only a limited number of records are available from
the marine realm itself. Here we use an Earth System-Climate Model of
intermediate complexity to simulate AMO-type behavior in the Atlantic with a
specific focus placed on the ability of ocean paleothermometers to capture
the associated surface and subsurface temperature variability. Given their
lower prediction errors and annual resolution, coral-based proxies of sea
surface temperature appear to be capable of reconstructing the temperature
variations associated with the past AMO with an adequate signal-to-noise
ratio. In contrast, the relatively high prediction error and low temporal
resolution of sediment-based proxies, such as the composition of
foraminiferal calcite, limits their ability to produce interpretable records
of past temperature anomalies corresponding to AMO activity. Whilst the presented
results will inevitably be model-dependent to some degree, the statistical framework
is model-independent and can be applied to a wide variety of scenarios. |
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