| PALEOCEANOGRAPHY |
Paleocene-Eocene Thermal Maximum(~55MyrBP) Isotope and Mg/Ca Data
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Tripati, A. and H. Elderfield. 2005. Deep-Sea Temperature and Circulation Changes at the Paleocene-Eocene Thermal Maximum.
Science, Vol. 308, pp. 1894.
| Data Coverage |
North: 32.65 * South: -28.03 |
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West: -17.55 * East: 158.5 |
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Altitude: -4428 m |
Start Year: 55850000 14C yr BP
* End Year: 55266000 14C yr BP
Data: Please Cite Data Contributors!
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Summary: A rapid increase in greenhouse gas levels is thought to have fueled global warming at the Paleocene-Eocene Thermal Maximum
(PETM). Foraminiferal magnesium/calcium ratios indicate that bottom waters warmed by 4 to 5C, similar to tropical and subtropical
surface ocean waters, implying no amplification of warming in high-latitude regions of deep-water formation under ice-free
conditions. Intermediate waters warmed before the carbon isotope excursion, in association with downwelling in the North Pacific
and reduced Southern Ocean convection, supporting changing circulation as the trigger for methane hydrate release. A switch
to deep convection in the North Pacific at the PETM onset could have amplified and sustained warming.
More Info on Paleoceanography Data |
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Parameters: Magnesium/Calcium ratio; delta O18 PDB (Benthic Foraminifers); delta C13 PDB (Benthic Foraminifers); radiocarbon years before 1950AD
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Complete XML Record: noaa-ocean-2637
(Last Revised: 2007-12-21 )
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DOC/NOAA/NESDIS/NCDC (National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce )
325 Broadway, E/CC23
Boulder, CO 80305
USA
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| http://www.ncdc.noaa.gov/paleo/ |
| E-mail: bruce.a.bauer@noaa.gov |
| E-mail: paleo@noaa.gov |
Phone: 303-497-6280
Fax: 303-497-6513
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