TY - JOUR
T1 - Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial
AU - Turney, C S M
AU - Jones, Richard
AU - Phipps, Steven J
AU - Thomas, Zoe
AU - Hogg, Alan G
AU - Peter, Kershaw
AU - Fogwill, Christopher J.
AU - Palmer, J.G.
AU - Christopher Bronk, Ramsey
AU - Adolphi, Florian
AU - Muscheler, Raimund
AU - Hughen, Konrad
AU - Richard A, Staff
AU - Grosvenor, Mark
AU - Golledge, Nicholas R.
AU - Hutchinson, David
AU - Haberle, Simon
AU - Rasmussen, Sune Olander
AU - Lorrey, Andrew
AU - Boswijk, Gretel
AU - Cooper, Alan
PY - 2017
Y1 - 2017
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 - Article
SN - 2041-1723
VL - 8
SP - 1
EP - 9
JO - Nature Communications
JF - Nature Communications
IS - 520
ER -