Changes in Caribbean surface hydrography during the Pliocene shoaling of the Central American Seaway
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- Silke Steph
- Leibniz Institute of Marine Sciences IFM‐GEOMAR Kiel Germany
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- Ralf Tiedemann
- Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany
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- Matthias Prange
- Deutsche Forschungsgemeinschaft Research Center Ocean Margins and Department of Geosciences University of Bremen Bremen Germany
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- Jeroen Groeneveld
- Leibniz Institute of Marine Sciences IFM‐GEOMAR Kiel Germany
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- Dirk Nürnberg
- Leibniz Institute of Marine Sciences IFM‐GEOMAR Kiel Germany
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- Lars Reuning
- Leibniz Institute of Marine Sciences IFM‐GEOMAR Kiel Germany
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- Michael Schulz
- Deutsche Forschungsgemeinschaft Research Center Ocean Margins and Department of Geosciences University of Bremen Bremen Germany
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- Gerald H. Haug
- GeoForschungsZentrum Potsdam Potsdam Germany
書誌事項
- 公開日
- 2006-12
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2004pa001092
- 公開者
- American Geophysical Union (AGU)
この論文をさがす
説明
<jats:p>Pliocene<jats:italic>δ</jats:italic><jats:sup>18</jats:sup>O records of shallow and deep dwelling planktonic foraminifers from the Caribbean (Ocean Drilling Program sites 999 and 1000), the tropical east Pacific (sites 1241 and 851), and the Atlantic (site 925, Ceara Rise, and site 1006, western Great Bahama Bank) were used to examine Atlantic‐Caribbean‐Pacific atmospheric and oceanic linkages associated with the progressive closure of the Central American Seaway (5.5–3 Ma). Comparisons indicate the development of an inner‐Caribbean salinity gradient in the mixed layer and salinity changes on precessional periodicities after 4.4 Ma (site 1000), when the Pacific‐Caribbean throughflow became significantly restricted. The high‐amplitude variability in salinity is also observed at site 1006, monitoring the Caribbean outflow into the Atlantic. Comparisons of Caribbean and Atlantic planktonic<jats:italic>δ</jats:italic><jats:sup>18</jats:sup>O records suggest the North Atlantic subtropical gyre as a major source for high‐salinity surface waters. Precession‐induced variations in the volume transport of Pacific surface water masses through the Panamanian Seaway are considered a main factor to explain the Caribbean salinity minima. Results from a coupled climate model point to changes in the El Niño–Southern Oscillation state as a potential trigger for changes in the amount of Pacific inflow into the Caribbean.</jats:p>
収録刊行物
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- Paleoceanography
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Paleoceanography 21 (4), PA4221-, 2006-12
American Geophysical Union (AGU)