Gulf of Alaska Radiocarbon data from benthic and planktonic foraminifera during the Late Glacial to the Holocene Davies-Walczak, M.H.; Mix, A.C.; Stoner, J.S.; Southon, J.R.; Cheseby, M.; Xuan, C. Davies-Walczak, M.H. Mix, A.C. Stoner, J.S. Southon, J.R. Cheseby, M. Xuan, C. earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,null,per mil,null,paleoceanography,null,null,N,calculated on Age Model 1) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year,null,paleoceanography,differenced,null,N,age difference benthic-planktonic foraminifera) earth science/paleoclimate/paleoceanography (age,null,null,year,null,paleoceanography,null,null,N,projection age calculated for benthic foraminiferal 14C relative to Intcal13 on Age Model 1) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,year,null,paleoceanography,null,null,N,Projection age calculated for planktonic foraminiferal 14C relative to Intcal13 on Age Model 2) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,radiocarbon year,null,paleoceanography,differenced,null,N,age difference benthic-planktonic foraminifera) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,year,null,paleoceanography,null,null,N,Projection age calculated for benthic foraminiferal 14C relative to Intcal13 on Age Model 2) earth science/paleoclimate/paleoceanography (Delta 14C,planktic foraminifer,null,per mil,null,paleoceanography,null,null,N,calculated on Age Model 2) earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,null,per mil,null,paleoceanography,null,null,N,calculated on Age Model 2) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,year,null,paleoceanography,null,null,N,projection age calculated for benthic foraminiferal 14C relative to Intcal13 on Age Model 1) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,year,null,paleoceanography,null,null,N,Projection age calculated for benthic foraminiferal 14C relative to Intcal13 on Age Model 2) earth science/paleoclimate/paleoceanography (age,null,null,year,null,paleoceanography,null,null,N,Projection age calculated for planktonic foraminiferal 14C relative to Intcal13 on Age Model 2) earth science/paleoclimate/paleocean (EW0408-85JC>LATITUDE 59.555>LONGITUDE -144.1535) Radiocarbon reconstructions of past ocean ventilation rates constrain oceanic sources and sinks of CO2 and mechanisms of subsurface hypoxia. Here, 14C in coexisting benthic and planktonic foraminifera from a sediment core 682 m deep off Southeast Alaska documents paleoventilation over the past ~17,000 years. A chronology based on calibrated planktonic foraminiferal dates, consistent with independent terrestrial dates for regional glacial retreat, yields deglacial projection ages moderately greater than those of the Holocene, suggesting comparatively limited ventilation. The observed Holocene increase of apparent ventilation at intermediate depths tracks inundation of the Bering Strait between ~11,800 and 13,200 years ago, suggesting that flooding of continental shelves and export of low salinity surface waters to the Arctic enhanced intermediate water formation in the North Pacific. An abrupt increase in the benthic–planktonic radiocarbon age gradient, implying homogenization of abyssal radiocarbon in deep and intermediate waters, aligns with the younger of two episodes of rapid rise of atmospheric CO2 and depletion of atmospheric D14C during deglaciation ~11,500–13,000 years ago, suggesting the North Pacific as a possible pathway for venting of oceanic CO2 to the atmosphere during the second half of the deglacial transition. STUDY NOTES: Radiocarbon data from benthic and planktonic foraminifera at continental slope site EW0408-85JC in the Gulf of Alaska. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Davies-Walczak, M.H. Investigator : Mix, A.C. Investigator : Stoner, J.S. Investigator : Southon, J.R. Investigator : Cheseby, M. Investigator : Xuan, C. 2017-03-15 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21690 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/davies-walczak2014/davies-walczak2014.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/davies-walczak2014/davies-walczak2014.txt English https://www.ncdc.noaa.gov/paleo/study/21690 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/davies-walczak2014/davies-walczak2014.txt Davies-Walczak, M.H., A.C. Mix, J.S. Stoner, J.R. Southon, M. Cheseby, and C. Xuan2014Late Glacial to Holocene radiocarbon constraints on North Pacific Intermediate Water ventilation and deglacial atmospheric CO2 sourcesEarth and Planetary Science Letters39757-6610.1016/j.epsl.2014.04.004http://www.sciencedirect.com/science/article/pii/S0012821X14002301 START YEAR: 17400 cal yr BP * END YEAR: -54 cal yr BP -144.1535 59.555 -144.1535 59.555