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

Chris S. M. Turney; Richard Jones; Steven J. Phipps; Zoë Thomas; Alan  Hogg; Peter Kershaw; Christopher Fogwill; Jonathan Palmer; Christopher Bronk Ramsey; Florian Adolphi; Raimund Muscheler; Konrad Hughen; Richard A. Staff; Mark Grosvenor; Nicholas R Golledge; Sune Olander Rasmussen; David K. Hutchinson; Simon Haberle; Andrew Lorrey; Gretel Boswijk; Alan Cooper

doi:10.1038/s41467-017-00577-6

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

Chris S. M. Turney, Richard Jones, Steven J. Phipps, Zoë Thomas, Alan Hogg, Peter Kershaw, Christopher Fogwill, Jonathan Palmer, Christopher Bronk Ramsey, Florian Adolphi, Raimund Muscheler, Konrad Hughen, Richard A. Staff, Mark Grosvenor, Nicholas R Golledge, Sune Olander Rasmussen, David K. Hutchinson, Simon Haberle, Andrew Lorrey, Gretel BoswijkAlan Cooper

Physics of Ice, Climate and Earth

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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.

Original language	English
Article number	520
Journal	Nature Communications
Volume	8
ISSN	2041-1723
DOIs	https://doi.org/10.1038/s41467-017-00577-6
Publication status	Published - 1 Dec 2017

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Turney, C. S. M., Jones, R., Phipps, S. J., Thomas, Z., Hogg, A., Kershaw, P., Fogwill, C., Palmer, J., Ramsey, C. B., Adolphi, F., Muscheler, R., Hughen, K., Staff, R. A., Grosvenor, M., Golledge, N. R., Rasmussen, S. O., Hutchinson, D. K., Haberle, S., Lorrey, A., ... Cooper, A. (2017). Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial. Nature Communications, 8, [520]. https://doi.org/10.1038/s41467-017-00577-6

Turney, CSM, Jones, R, Phipps, SJ, Thomas, Z, Hogg, A, Kershaw, P, Fogwill, C, Palmer, J, Ramsey, CB, Adolphi, F, Muscheler, R, Hughen, K, Staff, RA, Grosvenor, M, Golledge, NR, Rasmussen, SO, Hutchinson, DK, Haberle, S, Lorrey, A, Boswijk, G & Cooper, A 2017, 'Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial', Nature Communications, vol. 8, 520. https://doi.org/10.1038/s41467-017-00577-6

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title = "Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial",

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.",

author = "Turney, {Chris S. M.} and Richard Jones and Phipps, {Steven J.} and Zo{\"e} Thomas and Alan Hogg and Peter Kershaw and Christopher Fogwill and Jonathan Palmer and Ramsey, {Christopher Bronk} and Florian Adolphi and Raimund Muscheler and Konrad Hughen and Staff, {Richard A.} and Mark Grosvenor and Golledge, {Nicholas R} and Rasmussen, {Sune Olander} and Hutchinson, {David K.} and Simon Haberle and Andrew Lorrey and Gretel Boswijk and Alan Cooper",

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AU - Turney, Chris S. M.

AU - Jones, Richard

AU - Phipps, Steven J.

AU - Thomas, Zoë

AU - Hogg, Alan

AU - Kershaw, Peter

AU - Fogwill, Christopher

AU - Palmer, Jonathan

AU - Ramsey, Christopher Bronk

AU - Adolphi, Florian

AU - Muscheler, Raimund

AU - Hughen, Konrad

AU - Staff, Richard A.

AU - Grosvenor, Mark

AU - Golledge, Nicholas R

AU - Rasmussen, Sune Olander

AU - Hutchinson, David K.

AU - Haberle, Simon

AU - Lorrey, Andrew

AU - Boswijk, Gretel

AU - Cooper, Alan

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N2 - 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.

AB - 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.

U2 - 10.1038/s41467-017-00577-6

DO - 10.1038/s41467-017-00577-6

M3 - Journal article

C2 - 28900099

SN - 2041-1723

VL - 8

JO - Nature Communications

JF - Nature Communications

M1 - 520

ER -

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

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