Subpolar North Atlantic (ODP984) Holocene Planktic d18O and Mg/Ca Data Came, R.E.; Oppo, D.W.; McManus, J.F. Came, R.E. Oppo, D.W. McManus, J.F. Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (delta 18O,Neogloboquadrina pachyderma dextral,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Neogloboquadrina pachyderma dextral,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (weight,foraminifer,null,microgram,null,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/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 984>LATITUDE 61.43>LONGITUDE -24.08) Paired planktic foraminiferal {delta}18O and Mg/Ca data reveal trends of increasing temperatures (~3 °C) and salinities in the subpolar North Atlantic over the course of the Holocene, which were punctuated by abrupt events. The trends likely reflect an insolation-forced northward retreat of the boundary between polar and North Atlantic subsurface waters. The superimposed variability does not appear to be periodic, but tends to recur within a broad millennial band. The records provide convincing evidence of open-ocean cooling (nearly 2 °C) and freshening during the 8.2 ka event, and suggest similar conditions at 9.3 ka. However, the two largest temperature oscillations in our record (~2 °C) occurred during the past 4 k.y., suggesting a recent increase in temperature variability relative to the mid-Holocene, perhaps in response to neoglaciation, which began at about this time. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Came, R.E. Investigator : Oppo, D.W. Investigator : McManus, J.F. 2007-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5593 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/came2007 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/came2007 English https://www.ncdc.noaa.gov/paleo/study/5593 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp984-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/came2007 Came, R.E., D.W. Oppo, and J.F. McManus. 2007. Amplitude and timing of temperature and salinity variability in the subpolar North Atlantic over the past 10 k.y. Geology, 35(4), 315ŋ318. START YEAR: 11099 14C yr BP * END YEAR: 446 14C yr BP -24.08 61.43 -24.08 61.43