Extensive wet episodes in Late Glacial Australia resulting from high-latitude forcings
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Bayon, Germain; De Deckker, Patrick; Magee, John W.; Germain, Yoan; Bermell, Sylvain; Tachikawa, Kazuyo; Norman, Marc D.
Description
Millennial-scale cooling events termed Heinrich Stadials punctuated Northern Hemisphere climate during the last glacial period. Latitudinal shifts of the intertropical convergence zone (ITCZ) are thought to have rapidly propagated these abrupt climatic signals southward, influencing the evolution of Southern Hemisphere climates and contributing to major reorganisation of the global ocean atmosphere system. Here, we use neodymium isotopes from a marine sediment core to reconstruct the...[Show more]
dc.contributor.author | Bayon, Germain | |
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dc.contributor.author | De Deckker, Patrick | |
dc.contributor.author | Magee, John W. | |
dc.contributor.author | Germain, Yoan | |
dc.contributor.author | Bermell, Sylvain | |
dc.contributor.author | Tachikawa, Kazuyo | |
dc.contributor.author | Norman, Marc D. | |
dc.date.accessioned | 2017-05-09T00:55:42Z | |
dc.date.available | 2017-05-09T00:55:42Z | |
dc.identifier.issn | 2045-2322 | |
dc.identifier.uri | http://hdl.handle.net/1885/116827 | |
dc.description.abstract | Millennial-scale cooling events termed Heinrich Stadials punctuated Northern Hemisphere climate during the last glacial period. Latitudinal shifts of the intertropical convergence zone (ITCZ) are thought to have rapidly propagated these abrupt climatic signals southward, influencing the evolution of Southern Hemisphere climates and contributing to major reorganisation of the global ocean atmosphere system. Here, we use neodymium isotopes from a marine sediment core to reconstruct the hydroclimatic evolution of subtropical Australia between 90 to 20 thousand years ago. We find a strong correlation between our sediment provenance proxy data and records for western Pacific tropical precipitations and Australian palaeolakes, which indicates that Northern Hemisphere cooling phases were accompanied by pronounced excursions of the ITCZ and associated rainfall as far south as about 32°S. Comparatively, however, each of these humid periods lasted substantially longer than the mean duration of Heinrich Stadials, overlapping with subsequent warming phases of the southern high latitudes recorded in Antarctic ice cores. In addition to ITCZ-driven hydroclimate forcing, we infer that changes in Southern Ocean climate also played an important role in regulating late glacial atmospheric patterns of the Southern Hemisphere subtropical regions. | |
dc.description.sponsorship | This work was funded via an IEF Marie Curie fellowship to G.B. (Grant No. FP7-PEOPLE-2012-IEF 327778). | |
dc.format | 7 pages | |
dc.format.mimetype | application/pdf | |
dc.publisher | Nature Publishing Group | |
dc.rights | © The Author(s) 2017. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ | |
dc.source | Scientific Reports | |
dc.subject | millennial-scale | |
dc.subject | cooling | |
dc.subject | Heinrich Stadials | |
dc.subject | Northern Hemisphere | |
dc.subject | climate | |
dc.subject | global | |
dc.subject | ocean | |
dc.subject | atmosphere | |
dc.subject | latitudinal shifts | |
dc.subject | intertropical convergence zone (ITCZ) | |
dc.title | Extensive wet episodes in Late Glacial Australia resulting from high-latitude forcings | |
dc.type | Journal article | |
local.identifier.citationvolume | 7 | |
dcterms.dateAccepted | 2017-02-03 | |
dc.date.issued | 2017-03-08 | |
local.publisher.url | https://www.nature.com/ | |
local.type.status | Published Version | |
local.contributor.affiliation | De Deckker, Patrick, RSES General, CPMS Research School of Earth Sciences, The Australian National University | |
local.contributor.affiliation | Magee, John W., RSES General, CPMS Research School of Earth Sciences, The Australian National University | |
local.contributor.affiliation | Norman, Marc D., RSES General, CPMS Research School of Earth Sciences, The Australian National University | |
local.identifier.essn | 2045-2322 | |
local.bibliographicCitation.startpage | 44054 | |
local.identifier.doi | 10.1038/srep44054 | |
dcterms.accessRights | Open Access | |
Collections | ANU Research Publications |
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