Eastern Equatorial Pacific d18O and d13C Data from the Last Glacial Maximum Ford, H.L.; McChesney, C.L.; Hertzberg, J.E.; McManus, J.F. Ford, H.L. McChesney, C.L. Hertzberg, J.E. McManus, J.F. Last Glacial Maximum earth science/paleoclimate/paleoceanography (delta 13C,Trilobatus sacculifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globorotalia tumida,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,site name) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,reference for sample) earth science/paleoclimate/paleoceanography (delta 18O,Trilobatus sacculifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Neogloboquadrina dutertrei,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,LGM-Holocene subsurface d18O values) earth science/paleoclimate/paleoceanography (delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,differenced,null,N,LGM-Holocene subsurface-surface d18O gradient) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,Time years of sample) earth science/paleoclimate/paleoceanography (sample identification,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (longitude,null,null,degree east,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globorotalia menardii,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (collection water depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globorotalia inflata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Pulleniatina obliquiloculata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Pulleniatina obliquiloculata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,LGM-Holocene surface d18O values) earth science/paleoclimate/paleoceanography (delta 13C,Neogloboquadrina dutertrei,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globorotalia inflata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globorotalia menardii,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (latitude,null,null,degree north,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globorotalia tumida,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 849, 07MC-08JC, 09MC-17JC>LATITUDE >LONGITUDE ) (Eastern Equatorial Pacific Synthesis Set>LATITUDE >LONGITUDE ) The mean state and variability of the tropical Pacific is influenced by the depth of the thermocline. During the Last Glacial Maximum (~21,000 years ago), the zonal sea surface temperature gradient across the equatorial Pacific was reduced and productivity was generally lower than modern. To understand the thermocline depth's role in determining the Last Glacial Maximum tropical mean state, we reconstruct the upper ocean d18O profile from multiple species of planktic foraminifera. We synthesize existing records of surface and subsurface dwelling foraminifera to reconstruct the vertical d18O gradient throughout the eastern equatorial Pacific. We find the thermocline was deeper during the Last Glacial Maximum than the Holocene throughout the eastern equatorial Pacific region. The thermocline depth's role in the dynamic forcing of the cold tongue contributed to the reduced zonal SST gradient across the equatorial Pacific, decreased productivity, and presumably impacted El Niño-Southern Oscillation variability relative to the Holocene. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Ford, H.L. Investigator : McChesney, C.L. Investigator : Hertzberg, J.E. Investigator : McManus, J.F. 2018-11-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25611 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2018/ford2018-849-08jc-17jc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2018/ford2018-synthesis.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2018/ford2018-849-08jc-17jc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2018/ford2018-synthesis.txt English https://www.ncdc.noaa.gov/paleo/study/25611 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2018/ford2018-849-08jc-17jc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/ford2018/ford2018-synthesis.txt Ford, H.L., C.L. McChesney, J.E. Hertzberg, and J.F. McManus2018A Deep Eastern Equatorial Pacific Thermocline During the Last Glacial MaximumGeophysical Research Letters4510.1029/2018GL079710 START YEAR: 24734 cal yr BP * END YEAR: 0 cal yr BP -110.5197 -5.517 -81.583 8.2055