Extensive wet episodes in Late Glacial Australia resulting from high-latitude forcings
|Author(s)||Bayon Germain1, 2, De Deckker Patrick3, Magee John W.3, Germain Yoan1, Bermell Sylvain1, Tachikawa Kazuyo4, Norman Marc D.3|
|Affiliation(s)||1 : IFREMER, Unite Rech Geosci Marines, Brest, France.
2 : Royal Museum Cent Africa, Dept Earth Sci, Tervuren, Belgium.
3 : Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia.
4 : Aix Marseille Univ, CNRS, IRD, Coll France,CEREGE, Aix En Provence, France.
|Source||Scientific Reports (2045-2322) (Nature Publishing Group), 2017-03 , Vol. 7 , P. 44054 (7p.)|
|WOS© Times Cited||2|
|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.|