| PALEOCEANOGRAPHY |
350 KYr Sea Level Reconstruction and Foraminifer Isotope Data
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Lea, D.W., P.A. Martin, D.K. Pak, and H.J. Spero. 2002. Reconstructing a 350 ky history of sea level using planktonic Mg/Ca
and oxygen isotopic records from a Cocos Ridge core. Quaternary Science Reviews 21(1-3):283-293.
| Data Coverage |
North: 2.25 * South: 2.25 |
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West: -90.95 * East: -90.95 |
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Altitude: -2348 m |
Start Year: 361500 14C yr BP
* End Year: 1000 14C yr BP
Data: Please Cite Data Contributors!
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Summary: The record of oxygen isotopic variations in foraminifer shells from deep-sea cores preserves a continuous record of ice volume
and sea level oscillations. To extract the ice volume record, however, it is necessary to remove the temperature and local
hydrological influence on delta18O. We employ the strategy of estimating calcification temperatures from Mg/Ca and removing
this signal from an observed delta18O record of planktonic foraminifera from a core on the Cocos Ridge, eastern equatorial
Pacific. The residual, delta18Owater, reveals a pattern of changes that appears to be consistent with known ice volume and
sea level variations. Over the last four glacial terminations, delta18Owater decreases by 1.2+/-0.1%%. The magnitude of high
stands appears to be consistent with modern sea level during MIS 5.5 (5e), 7.1 and 7.5 but somewhat lower during MIS 9.1.
The magnitude of low stands is similar (~-120m) for MIS 2.2 (LGM), 6.2, 8.2 and 10.2. The Cocos Ridge record also shows a
period of intermediate sea level (~-30m) during MIS 6.5. At present it is not possible to validate these estimates for those
periods of time in which coral reef based estimates of sea level are unavailable.
More Info on Paleoceanography Data |
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Parameters: radiocarbon years before 1950AD; delta O18 PDB (Uvigerina sp.); delta O18 PDB (water); sea level in meters below sea level
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Complete XML Record: noaa-ocean-2614
(Last Revised: 2008-04-10 )
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DOC/NOAA/NESDIS/NCDC (National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce )
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USA
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| http://www.ncdc.noaa.gov/paleo/ |
| E-mail: bruce.a.bauer@noaa.gov |
| E-mail: paleo@noaa.gov |
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