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| Titel |
Can we use δ¹⁸O and temperature reconstructions to confidently estimate paleo-density? |
| VerfasserIn |
Andre Paul, Stefan Mulitza, Trond Dokken, Thorsten Kiefer, Claire Waelbroeck, Mara Weinelt |
| 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 |
250053837
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| Zusammenfassung |
| Identical twin experiments with an ocean general circulation model and its adjoint indicate
that data sparsity does not appear to be the limiting factor for reconstructing the Atlantic
meridional overturning circulation at the Last Glacial Maximum (LGM; see Takasumi et al.,
EGU2011-7259). Rather, information on paleo-sea surface density is needed. Here we
present a new attempt to combine sea-surface δ18O measurements on planktic foraminifera
with the published MARGO sea-surface temperature reconstruction for the LGM, to “‘back
out”’ estimates of sea-surface δ18O of sea water, salinity and density, including their
errors.
We find, for example, higher δ18Ow values in the subtropics and lower δ18Ow values in
the mid-to-high latitudes of the Atlantic Ocean. We discuss the implications for the glacial
hydrological cycle, as well as for surface water hydrology.
Furthermore, we address the question whether the large-scale gradients (gradients
between large regions over which averages are computed) can be used to confidently infer
changes in large-scale ocean circulation. |
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