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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/cp-2018-53
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 17 May 2018

Research article | 17 May 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Spatial pattern of accumulation at Taylor Dome during the last glacial inception: stratigraphic constraints from Taylor Glacier

James A. Menking1, Edward J. Brook1, Sarah A. Shackleton2, Jeffrey P. Severinghaus2, Michael Dyonisius3, Vasilii Petrenko3, Joseph R. McConnell4, Rachael H. Rhodes5, Thomas K. Bauska5, Daniel Baggenstos6, Shaun Marcott7, and Stephen Barker8 James A. Menking et al.
  • 1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, 97333, USA
  • 2Scripps Institution of Oceanography, University of California San Diego, La Jolla, 92037, USA
  • 3Department of Earth and Environmental Sciences, University of Rochester, Rochester, 14627, USA
  • 4Division of Hydrological Sciences, Desert Research Institute, Reno, 89512, USA
  • 5Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
  • 6Climate and Environmental Physics, University of Bern, Bern, 3012, Switzerland
  • 7Department of Geoscience, University of Wisconsin-Madison, Madison, 53706, USA
  • 8School of Earth and Ocean Sciences, Cardiff University, Cardiff, CF10 3AT,UK

Abstract. A new ice core retrieved from the Taylor Glacier blue ice area contains ice and air spanning the Marine Isotope Stage (MIS) 5/4 transition (74 to 65ka), a period of global cooling and glacial inception. Dating the ice and air bubbles in the new ice core reveals an ice age-gas age difference (Δage) approaching 10 ka during MIS 4, implying very low accumulation at the Taylor Glacier accumulation zone on the northern flank of Taylor Dome. A revised chronology for the Taylor Dome ice core (80 to 55ka), situated to the south of the Taylor Glacier accumulation zone, shows that Δage did not exceed 2.5ka at that location. The difference in Δage between the new Taylor Glacier ice core and the Taylor Dome ice core implies a spatial gradient in snow accumulation across Taylor Dome that intensified during the last glacial inception and through MIS 4.

James A. Menking et al.
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James A. Menking et al.
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Short summary
An ice core from Taylor Glacier, Antarctica, spans a period ~ 70,000 years ago when Earth entered the last ice age. Chemical analyses of the ice and air bubbles allow independent determination of the ages of the ice and the gas bubbles. The difference between the age of the ice and the bubbles at any given depth, called ∆age, is unusually high in the Taylor Glacier core compared to the Taylor Dome ice core situated to the south. This implies a dramatic accumulation gradient between the sites.
An ice core from Taylor Glacier, Antarctica, spans a period ~ 70,000 years ago when Earth...
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