Extensive wet episodes in Late Glacial Australia resulting from high-latitude forcings
Identifieur interne : 000C41 ( Main/Exploration ); précédent : 000C40; suivant : 000C42Extensive wet episodes in Late Glacial Australia resulting from high-latitude forcings
Auteurs : Germain Bayon [France, Belgique] ; Patrick De Deckker [Australie] ; John W. Magee [Australie] ; Yoan Germain [France] ; Sylvain Bermell [France] ; Kazuyo Tachikawa [France] ; Marc D. Norman [Australie]Source :
- Scientific Reports [ 2045-2322 ] ; 2017.
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.
Url:
DOI: 10.1038/srep44054
PubMed: NONE
PubMed Central: 5341032
Affiliations:
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Magee</name><affiliation wicri:level="1"><nlm:aff id="a3"><institution>The Australian National University, Research School of Earth Sciences</institution>, Canberra,<country>Australia</country></nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Germain, Yoan" sort="Germain, Yoan" uniqKey="Germain Y" first="Yoan" last="Germain">Yoan Germain</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>IFREMER, Unité de Recherche Géosciences Marines</institution>, Brest,<country>France</country></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Bermell, Sylvain" sort="Bermell, Sylvain" uniqKey="Bermell S" first="Sylvain" last="Bermell">Sylvain Bermell</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>IFREMER, Unité de Recherche Géosciences Marines</institution>, Brest,<country>France</country></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Tachikawa, Kazuyo" sort="Tachikawa, Kazuyo" uniqKey="Tachikawa K" first="Kazuyo" last="Tachikawa">Kazuyo Tachikawa</name><affiliation wicri:level="1"><nlm:aff id="a4"><institution>Aix Marseille University, CNRS, IRD, Collège de France, CEREGE</institution>, Aix-en-Provence,<country>France</country></nlm:aff><country xml:lang="fr">France</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Norman, Marc D" sort="Norman, Marc D" uniqKey="Norman M" first="Marc D." last="Norman">Marc D. Norman</name><affiliation wicri:level="1"><nlm:aff id="a3"><institution>The Australian National University, Research School of Earth Sciences</institution>, Canberra,<country>Australia</country></nlm:aff><country xml:lang="fr">Australie</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Scientific Reports</title><idno type="eISSN">2045-2322</idno><imprint><date when="2017">2017</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>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.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Bond, G" uniqKey="Bond G">G. Bond</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Denton, G H" uniqKey="Denton G">G. H. Denton</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Blunier, T" uniqKey="Blunier T">T. Blunier</name></author><author><name sortKey="Brook, E J" uniqKey="Brook E">E. J. Brook</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Wang, X" uniqKey="Wang X">X. Wang</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Carolin, S A" uniqKey="Carolin S">S. A. 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Waelbroeck</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list><country><li>Australie</li><li>Belgique</li><li>France</li></country></list><tree><country name="France"><noRegion><name sortKey="Bayon, Germain" sort="Bayon, Germain" uniqKey="Bayon G" first="Germain" last="Bayon">Germain Bayon</name></noRegion><name sortKey="Bermell, Sylvain" sort="Bermell, Sylvain" uniqKey="Bermell S" first="Sylvain" last="Bermell">Sylvain Bermell</name><name sortKey="Germain, Yoan" sort="Germain, Yoan" uniqKey="Germain Y" first="Yoan" last="Germain">Yoan Germain</name><name sortKey="Tachikawa, Kazuyo" sort="Tachikawa, Kazuyo" uniqKey="Tachikawa K" first="Kazuyo" last="Tachikawa">Kazuyo Tachikawa</name></country><country name="Belgique"><noRegion><name sortKey="Bayon, Germain" sort="Bayon, Germain" uniqKey="Bayon G" first="Germain" last="Bayon">Germain Bayon</name></noRegion></country><country name="Australie"><noRegion><name sortKey="De Deckker, Patrick" sort="De Deckker, Patrick" uniqKey="De Deckker P" first="Patrick" last="De Deckker">Patrick De Deckker</name></noRegion><name sortKey="Magee, John W" sort="Magee, John W" uniqKey="Magee J" first="John W." last="Magee">John W. Magee</name><name sortKey="Norman, Marc D" sort="Norman, Marc D" uniqKey="Norman M" first="Marc D." last="Norman">Marc D. Norman</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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