noaa-ocean-26692 Southwest Pacific Benthic Foraminiferal B/Ca during the past 25 ka Allen, K.A.; Sikes, E.L.; Hönisch, B.; Elmore, A.C.; Guilderson, T.P.; Rosenthal, Y.; Anderson, R.F. Southwest Pacific Benthic Foraminiferal B/Ca during the past 25 ka 2019-05-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/26692 Investigator K.A. Allen Investigator E.L. Sikes Investigator B. Hönisch Investigator A.C. Elmore Investigator T.P. Guilderson Investigator Y. Rosenthal Investigator R.F. Anderson earth science paleoclimate paleocean trace metals in carbonates geoscientificInformation 27200 cal yr BP 1400 cal yr BP Complete -36.7375 -36.7375 176.6398 176.6398 -1627 -1627 Ocean Pacific Ocean South Pacific Ocean RR0503 83TC/JPC>LATITUDE -36.7375>LONGITUDE 176.6398 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 Allen, Katherine A., Sikes, Elisabeth L., Hönisch, Bärbel, Elmore, Aurora C., Guilderson, Thomas P., Rosenthal, Yair, and Anderson, Robert F. 2015 Quaternary Science Reviews 122 180-191 10.1016/j.quascirev.2015.05.007

A greater amount of CO2 was stored in the deep sea during glacial periods, likely via greater efficiency of the biologic pump and increased uptake by a more alkaline ocean. Reconstructing past variations in seawater carbonate ion concentration (a major component of alkalinity) enables quantification of the relative roles of different oceanic CO2 storage mechanisms and also places constraints on the timing, magnitude, and location of subsequent deep ocean ventilation. Here, we present a record of deep-water inorganic carbon chemistry since the Last Glacial Maximum (LGM; ~19-23 ka BP), derived from sediment core RR0503-83 raised from 1627 m in New Zealand's Bay of Plenty. The core site lies within the upper limit of southern-sourced Circumpolar Deep Water (CDW), just below the lower boundary of Antarctic Intermediate Water (AAIW). We reconstruct past changes in bottom water inorganic carbon chemistry from the trace element and stable isotopic composition of calcite shells of the epibenthic foraminifer Cibicidoides wuellerstorfi. A record of ?CO32-(?CO32- = [COCO32-] in situ - [CO32-] saturation) derived from the foraminiferal boron to calcium ratio (B/Ca) provides evidence for greater ice-age storage of respired CO2 and reveals abrupt deglacial shifts in [CO32-] in situ of up to 30 μmol/kg (5 times larger than the difference between average LGM and Holocene values). The rapidity of these changes suggests the influence of changing water mass structure and atmospheric circulation in addition to a decrease in CO2 content of interior waters. STUDY NOTES: B/Ca of Cibicidoides wuellerstorfi (sometimes called Planulina wuellerstorfi) from RR0503-83

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/allen2015/allen2015-rr0503-83.txt NOAA Template File; RR0503-83 B/Ca Data USA/NOAA DIF Version 9.8.4 2019-05-02 2019-05-02