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| Titel |
Pliocene three-dimensional global ocean temperature reconstruction |
| VerfasserIn |
H. J. Dowsett, M. M. Robinson, K. M. Foley |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2009-12-03), S.769-783 |
| Datensatznummer |
250002704
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| Publikation (Nr.) |
 copernicus.org/cp-5-769-2009.pdf |
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| Zusammenfassung |
| The thermal structure of the mid-Piacenzian ocean is obtained by combining
the Pliocene Research, Interpretation and Synoptic Mapping Project (PRISM3)
multiproxy sea-surface temperature (SST) reconstruction with bottom water
temperature estimates from 27 locations produced using Mg/Ca paleothermometry
based upon the ostracod genus Krithe. Deep water temperature
estimates are skewed toward the Atlantic Basin (63% of the locations) and
represent depths from 1000 m to 4500 m. This reconstruction, meant to serve
as a validation data set as well as an initialization for coupled numerical
climate models, assumes a Pliocene water mass framework similar to that which
exists today, with several important modifications. The area of formation of
present day North Atlantic Deep Water (NADW) was expanded and extended
further north toward the Arctic Ocean during the mid-Piacenzian relative to
today. This, combined with a deeper Greenland-Scotland Ridge, allowed a
greater volume of warmer NADW to enter the Atlantic Ocean. In the Southern
Ocean, the Polar Front Zone was expanded relative to present day, but shifted
closer to the Antarctic continent. This, combined with at least seasonal
reduction in sea ice extent, resulted in decreased Antarctic Bottom Water
(AABW) production (relative to present day) as well as possible changes in
the depth of intermediate waters. The reconstructed mid-Piacenzian
three-dimensional ocean was warmer overall than today, and the hypothesized
aerial extent of water masses appears to fit the limited stable isotopic data
available for this time period. |
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