Journal
CLIMATE OF THE PAST
Volume 15, Issue 4, Pages 1537-1556Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/cp-15-1537-2019
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Funding
- National Science Foundation, Office of Polar Programs [PLR-1245821, PLR-1245659, PLR-1246148]
- UK National Environmental Research Council [502625]
- NERC [NE/J008133/1, bas0100034] Funding Source: UKRI
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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 pre-existing ice core records. The chronologies reveal an ice age-gas age difference (1 age) 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 1 age did not exceed 3 ka. The difference in 1 age 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.
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