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Linkages between rapid climate variability and deep-sea benthic foraminifera in the deep Subantarctic South Atlantic during the last 95 kyr

Diz, Paula and Barker, Stephen 2015. Linkages between rapid climate variability and deep-sea benthic foraminifera in the deep Subantarctic South Atlantic during the last 95 kyr. Paleoceanography 30 (6) , pp. 601-611. 10.1002/2015PA002784

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Abstract

We present a high-resolution record of benthic foraminifera fauna from a sediment core retrieved from the South Cape Basin (Subantarctic South Atlantic) spanning the last glacial cycle (95 kyr). Information provided by benthic foraminiferal assemblages together with paleoclimate proxies from the same core allow us to interpret changes in the style of primary production (episodic vs sustained) in relation to abrupt climate oscillations. Our results indicate that fluctuations in the abundance of the phytodetritus- related species, Epistominella exigua, are concomitant with millennial scale high latitude climate perturbations. Episodic phytoplankton blooms increased during a negative mode of the bipolar seesaw, irrespective of the magnitude of the perturbation (i.e., HS versus non-H stadial events). We provide a hypothesis linking the frequency and intensity of these events to atmospheric perturbations, interhemispheric climate variability and millennial scale changes in atmospheric CO2. A notable exception to the overall pattern is the generally high abundance of E. exigua across the globally synchronous onset of glacial MIS 4, a period generally characterized by increased dustiness and low quality organic carbon as inferred by the percentage of the non-phytodetritus species. This highlights the special characteristics governing the onset of MIS 4 in the Subantarctic.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Publisher: American Geophysical Union
ISSN: 0883-8305
Date of Acceptance: 1 May 2015
Last Modified: 12 Mar 2019 11:35
URI: http://orca.cf.ac.uk/id/eprint/73208

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