Title Search for a glacial-age 14C-depleted ocean reservoir
Author Broecker, W.; Clark, E.
Author Affil Broecker, W., Lamont-Doherty Earth Observatory, Palisades, NY
Source Geophysical Research Letters, 37(13), Citation L13606. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276
Publication Date 2010
Notes In English. 24 refs. GeoRef Acc. No: 310661
Index Terms radioactive age determination; carbon isotopes; glacial deposits; isotopes; Pleistocene; Quaternary deposits; radioactive isotopes; sediments; Pacific Ocean-- Equatorial Pacific; absolute age; benthic taxa; C-14; carbon; Cenozoic; cores; deglaciation; Equatorial Pacific; Foraminifera; glacial environment; Invertebrata; microfossils; ocean circulation; Pacific Ocean; paleo- oceanography; paleoatmosphere; paleocirculation; planktonic taxa; Protista; Quaternary; upper Pleistocene; upper Weichselian; Weichselian; Younger Dryas
Abstract Measurements of the radiocarbon age difference between mixed benthic foraminifera and several coexisting planktic entities were made in hopes of finding evidence for the existence of an isolated glacial-age abyssal ocean reservoir whose demise would explain the large drops in the 14C to C ratio in atmosphere and surface ocean carbon which occurred during the period of deglaciation. Forty-six new radiocarbon results were obtained at seven depths covering the full range of glacial time (i.e., ~27 to 15 14C kyrs) from an equatorial Pacific sediment core at 4.4-km water depth. Even though age reversals for foraminifera (but not for coccoliths) at two of the eight depths and large age differences between G. sacculifer and three submixed-layer planktic species mar this data set, there remains little likelihood that such a reservoir existed.
URL http://hdl.handle.net/10.1029/2010GL043969
Publication Type journal article
Record ID 66000014