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Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier

Menking, James A., Brook, Edward J., Shackleton, Sarah A., Severinghaus, Jeffrey P., Dyonisius, Michael N., Petrenko, Vasilii, McConnell, Joseph R., Rhodes, Rachael H., Bauska, Thomas K., Baggenstos, Daniel, Marcott, Shaun and Barker, Stephen 2019. Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier. Climate of the Past 15 (4) , pp. 1537-1556. 10.5194/cp-15-1537-2019

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Abstract

New ice cores retrieved from the Taylor Glacier (Antarctica) blue ice area contain ice and air spanning the Marine Isotope Stage (MIS) 5–4 transition, a period of global cooling and ice sheet expansion. We determine chronologies for the ice and air bubbles in the new ice cores by visually matching variations in gas- and ice-phase tracers to preexisting ice core records. The chronologies reveal an ice age–gas age difference (Δage) approaching 10 ka during MIS 4, implying very low snow accumulation in the Taylor Glacier accumulation zone. A revised chronology for the analogous section of the Taylor Dome ice core (84 to 55 ka), located to the south of the Taylor Glacier accumulation zone, shows that Δage did not exceed 3 ka. The difference in Δage between the two records during MIS 4 is similar in magnitude but opposite in direction to what is observed at the Last Glacial Maximum. This relationship implies that a spatial gradient in snow accumulation existed across the Taylor Dome region during MIS 4 that was oriented in the opposite direction of the accumulation gradient during the Last Glacial Maximum.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: European Geosciences Union (EGU) / Copernicus Publications
ISSN: 1814-9324
Funders: UK NERC
Date of First Compliant Deposit: 29 August 2019
Date of Acceptance: 1 July 2019
Last Modified: 30 Aug 2019 09:45
URI: http://orca.cf.ac.uk/id/eprint/125169

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