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

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Turney, CSM, Jones, RT, Phipps, SJ ORCID: 0000-0001-5657-8782, Thomas, Z, Hogg, A, Kershaw, AP, Fogwill, CJ, Palmer, J, Ramsey, CB, Adolphi, F, Muscheler, R, Hughen, KA, Staff, RA, Grosvenor, M, Golledge, NR, Rasmussen, SO, Hutchinson, DK, Haberle, S, Lorrey, A, Boswijk, G and Cooper, A 2017 , 'Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial' , Nature Communications, vol. 8 , pp. 1-9 , doi: 10.1038/s41467-017-00577-6.

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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 (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.

Item Type: Article
Authors/Creators:Turney, CSM and Jones, RT and Phipps, SJ and Thomas, Z and Hogg, A and Kershaw, AP and Fogwill, CJ and Palmer, J and Ramsey, CB and Adolphi, F and Muscheler, R and Hughen, KA and Staff, RA and Grosvenor, M and Golledge, NR and Rasmussen, SO and Hutchinson, DK and Haberle, S and Lorrey, A and Boswijk, G and Cooper, A
Keywords: climate, climate variability, climate modelling, palaeoclimate, ocean, atmosphere, glacial cycle, Greenland, Antarctica, Southern Ocean
Journal or Publication Title: Nature Communications
Publisher: Nature Publishing Group
ISSN: 2041-1723
DOI / ID Number: 10.1038/s41467-017-00577-6
Copyright Information:

Copyright 2017 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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