noaa-ocean-21690 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. Gulf of Alaska Radiocarbon data from benthic and planktonic foraminifera during the Late Glacial to the Holocene 2017-03-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21690 Investigator M.H. Davies-Walczak Investigator A.C. Mix Investigator J.S. Stoner Investigator J.R. Southon Investigator M. Cheseby Investigator C. Xuan 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 carbon isotopes geoscientificInformation 17400 cal yr BP -54 cal yr BP Complete 59.555 59.555 -144.1535 -144.1535 -682 -682 Ocean Pacific Ocean North Pacific Ocean Gulf Of Alaska EW0408-85JC>LATITUDE 59.555>LONGITUDE -144.1535 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Davies-Walczak, M.H., A.C. Mix, J.S. Stoner, J.R. Southon, M. Cheseby, and C. Xuan 2014 Earth and Planetary Science Letters 397 57-66 10.1016/j.epsl.2014.04.004 http://www.sciencedirect.com/science/article/pii/S0012821X14002301

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/davies-walczak2014/davies-walczak2014.txt Formatted Text File; Gulf of Alaska 14C Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11