Holocene δ¹⁸O diatom from ODP Hole 178-1098A, supplement to: Pike, Jennifer; Swann, George E A; Leng, Melanie J; Snelling, Andrea M (2013): Glacial discharge along the west Antarctic Peninsula during the Holocene. Nature Geoscience, 6(3), 199-202

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 (Russell and McGregor, 2010, doi:10.1007/s10584-009-9673-4). Suggested mechanisms range from upwelling of warm d...

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Bibliographic Details
Main Authors: Pike, Jennifer, Swann, George E A, Leng, Melanie J, Snelling, Andrea M
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2013
Subjects:
Sample code/label
AGE
Laboratory code/label
Diatoms, δ18O
Drilling/drill rig
DSDP/ODP/IODP sample designation
Mass spectrometer Finnigan MAT 253
Leg178
Joides Resolution
Ocean Drilling Program ODP
Antarctic
Antarctic Peninsula
Palmer Deep
Swann
The Antarctic
Antarc*
Ice Sheet
Online Access:https://dx.doi.org/10.1594/pangaea.857260
https://doi.pangaea.de/10.1594/PANGAEA.857260
Description
Summary: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 (Russell and McGregor, 2010, doi:10.1007/s10584-009-9673-4). Suggested mechanisms range from upwelling of warm deep waters onto the continental shelf in response to variations in the westerly winds (Bentley et al., 2009, doi:10.1177/0959683608096603), to an influence of El Niño-Southern Oscillation on sea surface temperatures (Shevenell et al., 2011, doi:10.1038/nature09751). 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 (Taylor and Sjunneskog, 2002, doi:10.1029/2000PA000564) ecology to investigate the oceanic environment. We show that two processes of atmospheric forcing-an increasing occurrence of La Niña events (Makou et al., 2010, doi:10.1130/G30366.1) 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 (Yeh et al., 2009, doi:10.1038/nature08316), its future impacts on the climatically sensitive system of the Antarctic Peninsula Ice Sheet remain to be established.

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