350 KYr Sea Level Reconstruction and Foraminifer Isotope Data Lea, D.W.; Martin, P.A.; Pak, D.K.; Spero, H.J. Lea, D.W. Martin, P.A. Pak, D.K. Spero, H.J. Sea Level Reconstruction earth science/paleoclimate/paleoceanography (delta 18O,Uvigerina sp.,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil PDB,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea level,delta 18O|magnesium/calcium,null,meter,null,climate reconstructions|paleoceanography,null,null,N,meters above modern sea level) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (TR163-19>LATITUDE 2.25>LONGITUDE -90.95) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lea, D.W. Investigator : Martin, P.A. Investigator : Pak, D.K. Investigator : Spero, H.J. 2002-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2614 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/tr16319l-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lea2002 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/tr16319l-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lea2002 English https://www.ncdc.noaa.gov/paleo/study/2614 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/tr16319l-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lea2002 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. START YEAR: 361500 cal yr BP * END YEAR: 1000 cal yr BP -90.95 2.25 -90.95 2.25