E.J. Maddison
Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica
Maddison, E.J.; Pike, J.; Leventer, A.; Domack, E.W.
Authors
J. Pike
A. Leventer
E.W. Domack
Contributors
Dr Eleanor Ross e.j.maddison@durham.ac.uk
Other
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.
Citation
Maddison, E., Pike, J., Leventer, A., & Domack, E. (2005). Deglacial seasonal and sub-seasonal diatom record from Palmer Deep, Antarctica. Journal of Quaternary Science, 20(5), 435-446. https://doi.org/10.1002/jqs.947
Journal Article Type | Article |
---|---|
Publication Date | Jul 1, 2005 |
Deposit Date | Oct 8, 2010 |
Journal | Journal of Quaternary Science |
Print ISSN | 0267-8179 |
Electronic ISSN | 1099-1417 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 20 |
Issue | 5 |
Pages | 435-446 |
DOI | https://doi.org/10.1002/jqs.947 |
Keywords | Antarctic Peninsula, Diatoms, Laminated sediments, Palaeoceanography, Palmer Deep. |
Publisher URL | http://onlinelibrary.wiley.com/doi/10.1002/jqs.947/abstract |
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