Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier
2019
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 ( Δ 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 Δ age did not exceed
3 ka. The difference in Δ 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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