Maddison, Eleanor; Pike, Jennifer; Leventer, Amy and Domack, Eugene W.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1002/jqs.947|
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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 4.4m thick laminated diatom ooze deposited during the last deglaciation is examined from a marine sediment core (ODP Site 1098) recovered from Basin I, 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:||Journal Article|
|Keywords:||Antarctic Peninsula; diatoms; laminated sediments; palaeoceanography; Palmer Deep|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
|Depositing User:||Eleanor Maddison|
|Date Deposited:||17 Nov 2006|
|Last Modified:||14 Jan 2016 16:17|
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