A proposal to obtain continuous, high-resolution records from sediment drifts off the Antarctic Peninsula and West Antarctica (proposal 732-FULL2)


Contact
Karsten.Gohl [ at ] awi.de

Abstract

Ice sheet histories and palaeocenographic interpretations based on sediment cores from high southerly latitudes have been stymied by imprecise chronological control, due in large part to lack of foraminiferal carbonate for isotopic analyses. The chronological problem can now be partially offset by using relative geomagnetic palaeointensity records. Previous coring on ODP Leg 178 demonstrated that sediment drifts off the Antarctic Peninsula carry a continuous, high-resolution Miocene to Recent archive of palaeoceanographic conditions and history of the Antarctic Peninsula Ice Sheet. However, the potential of existing ODP cores is compromised by two factors: (1) incomplete composite sections and (2) lack of precise chronological control.We propose to drill a series of new sites on these sediment drifts, and on ones further to the southwest that contain records of West Antarctic Ice Sheet fluctuations. Six proposed sites target expanded Pliocene-Quaternary sequences, with two sites targeting the pre-Pliocene record at locations characterized by relatively thin younger sequences.There are few targets in the circum-Antarctic region that rival the potential offered by these sediment drifts. Recovery of these sediment cores and integration of data from them with polar ice cores will contribute significantly to our understanding of the role of West Antarctica and the adjacent Southern Ocean in global atmospheric and oceanographic processes.



Item Type
Conference (Talk)
Authors
Divisions
Programs
Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
UK IODP Symposium, LondonMay 2009..
Eprint ID
20811
Cite as
Channell, J. E. T. , Larter, R. D. , Hillenbrand, C. D. , Vautravers, M. , Hodell, D. A. , Hernández-Molina, F. J. , Gohl, K. and Rebesco, M. (2009): A proposal to obtain continuous, high-resolution records from sediment drifts off the Antarctic Peninsula and West Antarctica (proposal 732-FULL2) , UK IODP Symposium, LondonMay 2009. .


Share

Research Platforms

Campaigns


Actions
Edit Item Edit Item