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Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial

Turney, Chris S M; Jones, Richard T.; Phipps, Steven J.; Thomas, Zoë A.; Hogg, Alan; Kershaw, A. Peter; Fogwill, Christopher J.; Palmer, Jonathan; Bronk Ramsey, Christopher and Adolphi, Florian LU , et al. (2017) In Nature Communications 8(1).
Abstract

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 data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C data sets, implying limited changes in deep water formation. However, a Southern Ocean... (More)

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 data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C data sets, 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 generate climate changes that are propagated globally via an atmospheric Rossby wave train.

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Nature Communications
volume
8
issue
1
publisher
Nature Publishing Group
external identifiers
  • scopus:85029301605
  • wos:000410452800002
ISSN
2041-1723
DOI
10.1038/s41467-017-00577-6
language
English
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yes
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f1d984ad-438d-42bf-a20f-d86cf1f02efc
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2017-09-29 07:55:14
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2018-01-16 13:19:52
@article{f1d984ad-438d-42bf-a20f-d86cf1f02efc,
  abstract     = {<p>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 <sup>14</sup>C data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment <sup>14</sup>C data sets, 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 generate climate changes that are propagated globally via an atmospheric Rossby wave train.</p>},
  articleno    = {520},
  author       = {Turney, Chris S M and Jones, Richard T. and Phipps, Steven J. and Thomas, Zoë A. and Hogg, Alan and Kershaw, A. Peter and Fogwill, Christopher J. and Palmer, Jonathan and Bronk Ramsey, Christopher and Adolphi, Florian and Muscheler, Raimund and Hughen, Konrad A. and Staff, Richard A. and Grosvenor, Mark and Golledge, Nicholas R. and Rasmussen, Sune Olander and Hutchinson, David K. and Haberle, Simon and Lorrey, Andrew and Boswijk, Gretel and Cooper, Alan},
  issn         = {2041-1723},
  language     = {eng},
  month        = {12},
  number       = {1},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial},
  url          = {http://dx.doi.org/10.1038/s41467-017-00577-6},
  volume       = {8},
  year         = {2017},
}