Antarctic climate signature in the Greenland ice core record

Barker, Stephen ORCID: https://orcid.org/0000-0001-7870-6431 and Knorr, Gregor 2007. Antarctic climate signature in the Greenland ice core record. Proceedings of the National Academy of Sciences 104 (44) , pp. 17278-17282. 10.1073/pnas.0708494104

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Abstract

A numerical algorithm is applied to the Greenland Ice Sheet Project 2 (GISP2) dust record from Greenland to remove the abrupt changes in dust flux associated with the Dansgaard–Oeschger (D–O) oscillations of the last glacial period. The procedure is based on the assumption that the rapid changes in dust are associated with large-scale changes in atmospheric transport and implies that D–O oscillations (in terms of their atmospheric imprint) are more symmetric in form than can be inferred from Greenland temperature records. After removal of the abrupt shifts the residual, dejumped dust record is found to match Antarctic climate variability with a temporal lag of several hundred years. It is argued that such variability may reflect changes in the source region of Greenland dust (thought to be the deserts of eastern Asia). Other records from this region and more globally also reveal Antarctic-style variability and suggest that this signal is globally pervasive. This provides the potential basis for suggesting a more important role for gradual changes in triggering more abrupt transitions in the climate system.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	G Geography. Anthropology. Recreation > GC Oceanography Q Science > QE Geology
Uncontrolled Keywords:	Dansgaard–Oeschger events; rapid climate change; GISP2 dust record
Publisher:	National Academy of Sciences
ISSN:	1091-6490
Last Modified:	17 Oct 2022 08:53
URI:	https://orca.cardiff.ac.uk/id/eprint/1365

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