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

TitleSpatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier
Publication TypeJournal Article
Year of Publication2019
AuthorsMenking 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.
Volume15
Pagination1537-1556
Date Published2019/08
Type of ArticleArticle
ISBN Number1814-9324
Accession NumberWOS:000480290300002
Keywordsantarctic 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
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 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.

DOI10.5194/cp-15-1537-2019
Student Publication: 
No
Research Topics: 
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