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Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica.

Maddison, E.J. and Pike, J. and Leventer, A. and Domack, E.W. (2005) 'Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica.', Journal of quaternary science., 20 (5). pp. 435-446.

Abstract

The Antarctic Peninsula is one of the most sensitive regions of Antarctica to climate change. Here, ecological and cryospheric systems respond rapidly to climate fluctuations. A 4.4 m thick laminated diatom ooze deposited during the last deglaciation is examined from a marine sediment core (ODP Site 1098) recovered from Basin 1, Palmer Deep, western Antarctic Peninsula. This deglacial laminated interval was deposited directly over a glaciomarine diamict, hence during a globally recognised period of rapid climate change. The ultra-high-resolution deglacial record is analysed using SEM backscattered electron imagery and secondary electron imagery. Laminated to thinly bedded orange-brown diatom ooze (near monogeneric Hyalochaete Chaetoceros spp. resting spores) alternates with blue-grey terrigenous sediments (open water diatom species). These discrete laminae are interpreted as austral spring and summer signals respectively, with negligible winter deposition. Sub-seasonal sub-laminae are observed repeatedly through the summer laminae, suggesting variations in shelf waters throughout the summer. Tidal cycles, high storm intensities and/or intrusion of Circumpolar Deep Water onto the continental shelf introduced conditions which enhanced specific species productivity through the season.

Item Type:Article
Keywords:Antarctic Peninsula, Diatoms, Laminated sediments, Palaeoceanography, Palmer Deep.
Full text:Full text not available from this repository.
Publisher Web site:http://dx.doi.org/10.1002/jqs.947
Record Created:12 Oct 2010 10:20
Last Modified:12 Oct 2010 12:24

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