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Near constancy of the Pacific Ocean surface to mid-depth radiocarbon-age difference over the last 20 kyr

Broecker, W., Clark, E. and Barker, Stephen 2008. Near constancy of the Pacific Ocean surface to mid-depth radiocarbon-age difference over the last 20 kyr. Earth and Planetary Science Letters 274 (3-4) , pp. 322-326. 10.1016/j.epsl.2008.07.035

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Abstract

Although 13C to 12C and cadmium to calcium ratios provide information regarding the distribution of deep water masses during late glacial time and during the period of deglaciation, our knowledge of the rate at which these water masses were ventilated comes mainly from the difference in radiocarbon-age between coexisting bottom- and surface-dwelling foraminifera. Paired benthic/planktonic foraminiferal radiocarbon-age differences covering last 20 kyr in a high-deposition-rate western equatorial Pacific core, MD01-2386, from a water depth of 2.8 km show no significant climate-related variations over this period. This result is surprising for we would have expected a change in this age difference between the last glacial maximum (LGM) and the Holocene and also during the Mystery Interval (17.5–14.5 kyr ago) when the waters in a radiocarbon-depleted abyssal reservoir were presumably being mixed back into the remainder of the ocean.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
Uncontrolled Keywords: deep recirculations; general circulation; carbon cycling; chemical tracers; glacial; thermohaline
Publisher: Elsevier
ISSN: 0012-821X
Last Modified: 04 Jun 2017 02:28
URI: http://orca.cf.ac.uk/id/eprint/11134

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