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

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.;

Menking JA; Brook EJ; Shackleton SA; Severinghaus JP; Dyonisius MN; Petrenko V; McConnell JR; Rhodes RH; Bauska TK; Baggenstos D

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