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| Titel |
Mismatch between the depth habitat of planktonic foraminifera and the calibration depth of SST transfer functions may bias reconstructions |
| VerfasserIn |
R. J. Telford, C. Li, M. Kucera |
| 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 ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-22), S.859-870 |
| Datensatznummer |
250018024
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| Publikation (Nr.) |
 copernicus.org/cp-9-859-2013.pdf |
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| Zusammenfassung |
We demonstrate that the temperature signal in the planktonic foraminifera
assemblage data from the North Atlantic typically does not originate from
near-surface waters and argue that this has the potential to bias sea
surface temperature reconstructions using transfer functions calibrated
against near-surface temperatures if the thermal structure of the upper few
hundred metres of ocean changes over time. CMIP5 climate models indicate
that ocean thermal structure in the North Atlantic changed between the Last
Glacial Maximum (LGM) and the pre-industrial (PI), with some regions, mainly
in the tropics, of the LGM ocean lacking good thermal analogues in the PI.
Transfer functions calibrated against different depths reconstruct a marked
subsurface cooling in parts of the tropical North Atlantic during the last
glacial, in contrast to previous studies that reconstruct only a modest
cooling. These possible biases in temperature reconstructions may affect
estimates of climate sensitivity based on the difference between LGM and
pre-industrial climate. Quantifying these biases has the potential to alter
our understanding of LGM climate and improve estimates of
climate sensitivity. |
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