High-resolution (decadal-scale) deglacial planktonic oxygen isotope records from the Gulf of Alaska Praetorius, S.K.; Mix, A.C. Praetorius, S.K. Mix, A.C. earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (EW0408-26TC/JC, 66JC, 85JC>LATITUDE >LONGITUDE ) (EW0408-85JC>LATITUDE 59.555>LONGITUDE -144.1535) (EW0408-26TC/JC>LATITUDE 56.96>LONGITUDE -136.43) (EW0408-66JC>LATITUDE 57.872382>LONGITUDE -137.10446) Oxygen isotope data from planktonic and benthic foraminifera, on a high-resolution age model (44 14C dates spanning 17,400 years), document deglacial environmental change on the southeast Alaska margin (59°33.32'N, 144°9.21'W, 682 m water depth). Surface freshening (i.e., d18O reduction of 0.8‰) began at 16,650 ± 170 cal years B.P. during an interval of ice proximal sedimentation, likely due to freshwater input from melting glaciers. A sharp transition to laminated hemipelagic sediments constrains retreat of regional outlet glaciers onto land circa 14,790 ± 380 cal years B.P. Abrupt warming and/or freshening of the surface ocean (i.e., additional d18O reduction of 0.9‰) coincides with the Bølling Interstade of northern Europe and Greenland. Cooling and/or higher salinities returned during the Allerød interval, coincident with the Antarctic Cold Reversal, and continue until 11,740 ± 200 cal years B.P., when onset of warming coincides with the end of the Younger Dryas. An abrupt 1‰ reduction in benthic d18O at 14,250 ± 290 cal years B.P. likely reflects a decrease in bottom water salinity driven by deep mixing of glacial meltwater, a regional megaflood event, or brine formation associated with sea ice. Two laminated opal-rich intervals record discrete episodes of high productivity during the last deglaciation. These events, precisely dated here at 14,790 ± 380 to 12,990 ± 190 cal years B.P. and 11,160 ± 130 to 10,750 ± 220 cal years B.P., likely correlate to similar features observed elsewhere on the margins of the North Pacific and are coeval with episodes of rapid sea level rise. Remobilization of iron from newly inundated continental shelves may have helped to fuel these episodes of elevated primary productivity and sedimentary anoxia. STUDY NOTES: Gulf of Alaska planktonic oxygen isotope records. The data for Neogloboquadrina pachyderma sinistral (Nps) and Globigerina bulloides (Gb) for each of the three core sites is tabulated in separate excel sheets, along with the composite records on the original and tuned age models. Data is listed as depth in core. The age controls based on the calibrated radiocarbon dates and the age controls for the tuned age model are listed in separate excel sheets. No tuning was applied to the age model of EW0408-85JC for the composite records presented here. Marine reservoir ages applied to the Marine13 radiocarbon calibration are 595 + 50 yrs for EW0408-66JC, 735 + 50 yrs for EW0408-26JC, and 800 + 50 yrs for EW0408-85JC. Data from core EW0408-85JC are previously published in Davies et al. (2011). The d18O of core EW0408-66JC was corrected with an offset of +0.3 o/oo from 4-11 ka and +0.4 o/oo from 11-13.5 ka in order to adjust for differences in the d18O of seawater (related to salinity) between sites. Data was linearly interpolated on a 25 yr timestep to make the composite records. Provided Keywords: North Pacific, deglacial, abrupt climate change NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Praetorius, S.K. Investigator : Mix, A.C. 2019-04-15 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26630 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-composite-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-composite-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-85jc-plank.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-agecontrol.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-26tc_jc-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-66jc-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-26tc_jc-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-66jc-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-composite-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-composite-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-85jc-plank.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-agecontrol.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-26tc_jc-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-66jc-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-26tc_jc-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-66jc-gbull.txt English https://www.ncdc.noaa.gov/paleo/study/26630 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-composite-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-composite-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-85jc-plank.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-agecontrol.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-26tc_jc-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-66jc-nps.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-26tc_jc-gbull.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/praetorius2014/praetorius2014-66jc-gbull.txt Praetorius, S.K. and A.C. Mix2014Synchronization of North Pacific and Greenland climates preceded abrupt deglacial warmingScience345444-44810.1126/science.1252000 Davies, M.H., A.C. Mix, J.S. Stoner, J.A. Addison, J. Jaeger, B. Finney, and J. Wiest2011The deglacial transition on the southeastern Alaska Margin: Meltwater input, sea level rise, marine productivity, and sedimentary anoxiaPaleoceanography26PA222310.1029/2010PA002051 START YEAR: 18170 cal yr BP * END YEAR: 400 cal yr BP -144.1535 56.96 -136.43 59.555