Rapid global ocean-atmosphere response to Southern Ocean fre

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TitleRapid global ocean-atmosphere response to Southern Ocean freshening during the last glacialAbstractContrasting 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. © 2017 The Author(s).

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1st AuthorTurney, C. AuthorTurney, C.Jones, R.Phipps, S.Thomas, Z.Hogg, A.Kershaw, A.Fogwill, C.Palmer, J.Bronk Ramsey, C.Adolphi, F.Muscheler, R.Hughen, K.Staff, R.Grosvenor, M.Golledge, N.Rasmussen, S.Hutchinson, D.Haberle, S.Lorrey, A.Boswijk, G.Cooper, A.Year2017JournalNature CommunicationsVolume8Number1DOI10.1038/s41467-017-00577-6URLhttps://www.scopus.com/inward/recor.....38a9eb0ac98c012e0a2b828efPublisherNature Publishing GroupKeywordscarbon 14water, atmosphere-ocean systemclimate variationconiferous treedeep water formationglobal changeHeinrich eventice-rafted debrisiceberg calvinginterstadialLast GlacialmeltwaterpaleoceanographypaleotemperatureRossby wave, AntarcticaArticleatmosphereclimate changeglacial periodglobal climateGreenlandicebergNew ZealandpaleoclimatePleistoceneprecipitationsalinityseasea surface temperaturesedimentwarming, AntarcticaArcticAtlantic OceanAtlantic Ocean (North)Atlantic SectorGreenlandPacific OceanPacific Ocean (Equatorial)Southern Ocean, Agathis australis

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CitationTurney, C., Jones, R., Phipps, S., Thomas, Z., Hogg, A., Kershaw, A., Fogwill, C., Palmer, J., Bronk Ramsey, C., Adolphi, F., Muscheler, R., Hughen, K., Staff, R., Grosvenor, M., Golledge, N., Rasmussen, S., Hutchinson, D., 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, 8(1)Antarctica NZ supported?YesNZARI?No

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