Tropical Pacific Paleocene-Eocene Thermal Maximum(~55Ma) Isotope and Mg/Ca Data Zachos, J.C.; Wara, M.W.; Bohaty, S.M.; Delaney, M.L.; Petrizzo, M.R.; Brill, A.; Bralower, T.J.; Premoli-Silva, I. Zachos, J.C. Wara, M.W. Bohaty, S.M. Delaney, M.L. Petrizzo, M.R. Brill, A. Bralower, T.J. Premoli-Silva, I. earth science/paleoclimate/paleoceanography (magnesium/calcium,planktic foraminifer,null,dimensionless,null,paleoceanography,null,null,N,Morozovella velascoensis) earth science/paleoclimate/paleoceanography (delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,Morozovella velascoensis) earth science/paleoclimate/paleoceanography (delta 13C,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,Acarinina soldadoensis) earth science/paleoclimate/paleoceanography (delta 13C,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,Morozovella velascoensis) earth science/paleoclimate/paleoceanography (delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,Acarinina soldadoensis) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,planktic foraminifer,null,dimensionless,null,paleoceanography,null,null,N,Acarinina soldadoensis) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP1209B>LATITUDE 32.65>LONGITUDE 158.5) The Paleocene-Eocene Thermal Maximum (PETM) has been attributed to a rapid rise in greenhouse gas levels. If so, warming should have occurred at all latitudes, although amplified toward the poles. Existing records reveal an increase in high-latitude sea surface temperatures (SSTs) (8° to 10°C) and in bottom water temperatures (4° to 5°C). To date, however, the character of the tropical SST response during this event remains unconstrained. Here we address this deficiency by using paired oxygen isotope and minor element (magnesium/calcium) ratios of planktonic foraminifera from a tropical Pacific core to estimate changes in SST. Using mixed-layer foraminifera, we found that the combined proxies imply a 4° to 5°C rise in Pacific SST during the PETM. These results would necessitate a rise in atmospheric pCO2 to levels three to four times as high as those estimated for the late Paleocene. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Zachos, J.C. Investigator : Wara, M.W. Investigator : Bohaty, S.M. Investigator : Delaney, M.L. Investigator : Petrizzo, M.R. Investigator : Brill, A. Investigator : Bralower, T.J. Investigator : Premoli-Silva, I. 2003-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2652 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/zachos2003 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o1209b-z-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/zachos2003 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o1209b-z-tab.txt English https://www.ncdc.noaa.gov/paleo/study/2652 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/zachos2003 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o1209b-z-tab.txt Zachos, J.C., M.W. Wara, S. Bohaty, M.L. Delaney, M.R. Petrizzo, A. Brill, T.J. Bralower, I. Premoli-Silva. 2003. A Transient Rise in Tropical Sea Surface Temperature During the Paleocene-Eocene Thermal Maximum. Science, Vol. 302, 1551-1554. 158.5 32.65 158.5 32.65