|Title||Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier|
|Publication Type||Journal Article|
|Year of Publication||2019|
|Authors||Menking J.A, Brook E.J, Shackleton S.A, Severinghaus JP, Dyonisius M.N, Petrenko V., McConnell J.R, Rhodes R.H, Bauska T.K, Baggenstos D, Marcott S., Barker S.|
|Type of Article||Article|
|Keywords||antarctic ice; antarctica; atmospheric co2; blue ice area; chronology aicc2012; climate-change; east; Geology; last deglaciation; mcmurdo dry valleys; Meteorology & Atmospheric Sciences; polar ice; stable-isotopes|
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.