Journal article
Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial
- Abstract:
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Contrasting Greenland and Antarctic temperatures during the last glacial period (115,000 to 11,650 years ago) are thought to have been driven by imbalances in the rates of formation of North Atlantic and Antarctic Deep Water (the ‘bipolar seesaw’). Here we exploit a bidecadally-resolved 14C dataset obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate datasets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 to years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C datasets, implying limited changes in deep water formation. However, a Southern Ocean (Atlantic-sector) iceberg rafted debris event appears to have occurred synchronously with GI-5.1 warming and decreased precipitation over the western equatorial Pacific and Atlantic. An ensemble of transient meltwater simulations shows that Antarctic-sourced salinity anomalies can be propagated globally via an atmospheric Rossby wave train.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 2.4MB, Terms of use)
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- Publisher copy:
- 10.1038/s41467-017-00577-6
Authors
- Publisher:
- Nature Publishing Group
- Journal:
- Nature Communications More from this journal
- Volume:
- 8
- Pages:
- 520
- Publication date:
- 2017-09-12
- Acceptance date:
- 2017-07-07
- DOI:
- EISSN:
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2041-1723
- Keywords:
- Pubs id:
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pubs:705514
- UUID:
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uuid:2480939a-69b7-4d8f-a4ef-77d7fc4980d9
- Local pid:
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pubs:705514
- Source identifiers:
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705514
- Deposit date:
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2017-07-07
Terms of use
- Copyright holder:
- Turney etal
- Copyright date:
- 2017
- Notes:
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Open Access. This article is licensed under a Creative Commons
Attribution 4.0 International License, which permits use, sharing,
adaptation, distribution and reproduction in any medium or format, as long as you give
appropriate credit to the original author(s) and the source, provide a link to the Creative
Commons license, and indicate if changes were made. The images or other third party
material in this article are included in the article’s Creative Commons license, unless
indicated otherwise in a credit line to the material. If material is not included in the
article’s Creative Commons license and your intended use is not permitted by statutory
regulation or exceeds the permitted use, you will need to obtain permission directly from
the copyright holder. To view a copy of this license, visit http://creativecommons.org/
licenses/by/4.0/. © The Author(s) 2017
- Licence:
- CC Attribution (CC BY)
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