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Glacial discharge along the west Antarctic Peninsula during the Holocene

Pike, Jennifer; Swann, George E.A.; Leng, Melanie J.; Snelling, Andrea M.

Authors

Jennifer Pike

Melanie J. Leng

Andrea M. Snelling



Abstract

The causes for rising temperatures along the Antarctic Peninsula during the late Holocene have been debated, particularly in light of instrumental records of warming over the past decades. Suggested mechanisms range from upwelling of warm deep waters onto the continental shelf in response to variations in the westerly winds, to an influence of El Niño–Southern Oscillation on sea surface temperatures. Here, we present a record of Holocene glacial ice discharge, derived from the oxygen isotope composition of marine diatoms from Palmer Deep along the west Antarctic Peninsula continental margin. We assess atmospheric versus oceanic influences on glacial discharge at this location, using analyses of diatom geochemistry to reconstruct atmospherically forced glacial ice discharge and diatom assemblage ecology to investigate the oceanic environment. We show that two processes of atmospheric forcing—an increasing occurrence of La Niña events and rising levels of summer insolation—had a stronger influence during the late Holocene than oceanic processes driven by southern westerly winds and upwelling of upper Circumpolar Deepwater. Given that the evolution of El Niño–Southern Oscillation under global warming is uncertain, its future impacts on the climatically sensitive system of the Antarctic Peninsula Ice Sheet remain to be established.

Journal Article Type Article
Publication Date Mar 1, 2013
Journal Nature Geoscience
Print ISSN 1752-0894
Electronic ISSN 1752-0908
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 6
APA6 Citation Pike, J., Swann, G. E., Leng, M. J., & Snelling, A. M. (2013). Glacial discharge along the west Antarctic Peninsula during the Holocene. Nature Geoscience, 6, doi:10.1038/ngeo1703
DOI https://doi.org/10.1038/ngeo1703
Keywords Cryospheric science, Ocean sciences, Palaeoclimate
Publisher URL http://www.nature.com/ngeo/journal/v6/n3/full/ngeo1703.html
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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