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Late-Holocene climatic change recorded in sediment cores from Ellis Fjord, eastern Antarctica

Citation

McMinn, A and Heijnis, H and Harle, K and McOrist, G, Late-Holocene climatic change recorded in sediment cores from Ellis Fjord, eastern Antarctica, The Holocene, 11, (3) pp. 291-300. ISSN 0959-6836 (2001) [Refereed Article]

DOI: doi:10.1191/095968301671577682

Abstract

An analysis of diatom assemblages, Total Organic Carbon (TOC), carbon-nitrogen ratio, δ13C, biogenic silica and carbonate in two marine sediment cores from Ellis Fjord, eastern Antarctica, reveals episodes of climatic change at 3600, 2500, 2000 and 1000 yr BP. Using the diatom data, principal component analysis, the fast-ice index (FI), benthic index (BI) and snow index (SI) (which are derived from the diatom data), a period of reduced temporal sea-ice cover is identified prior to 2500 BP. There was a large increase in sea-ice extent between 2500 and 2000 BP followed by a smaller decline. Temporal sea-ice extent after 2000 BP was still significantly greater than prior to 2500 BP. Both cores were taken from anoxic basins within the fjord. It was found that the better preservation allowed the recognition of taxa such as Chaetoceros vegetative cells, which are not usually preserved. This enabled the distinction between ice-edge blooms, dominated by Fragilariopsis curta, and open-water blooms dominated by Chaetoceros. Even though Watts Basin receives a significant summer meltwater input each year, it has not been possible to recognize this signal in the sediment core.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Palaeontology (incl. Palynology)
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Environment not elsewhere classified
Author:McMinn, A (Professor Andrew McMinn)
ID Code:22393
Year Published:2001
Web of Science® Times Cited:25
Deposited By:IASOS
Deposited On:2001-08-01
Last Modified:2002-06-12
Downloads:0

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