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Australian shelf sediments reveal shifts in Miocene Southern Hemisphere westerlies
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.
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Number of Authors: 32
2017 (English)In: Science Advances, ISSN 0036-8156, E-ISSN 2375-2548, Vol. 3, no 5, e1602567Article in journal (Refereed) Published
Abstract [en]

Global climate underwent a major reorganization when the Antarctic ice sheet expanded ~14 million years ago (Ma) (1). This event affected global atmospheric circulation, including the strength and position of the westerlies and the Intertropical Convergence Zone (ITCZ), and, therefore, precipitation patterns (25). We present new shallow-marine sediment records from the continental shelf of Australia (International Ocean Discovery Program Sites U1459 and U1464) providing the first empirical evidence linking high-latitude cooling around Antarctica to climate change in the (sub)tropics during the Miocene. We show that Western Australia was arid during most of the Middle Miocene. Southwest Australia became wetter during the Late Miocene, creating a climate gradient with the arid interior, whereas northwest Australia remained arid throughout. Precipitation and river runoff in southwest Australia gradually increased from 12 to 8 Ma, which we relate to a northward migration or intensification of the westerlies possibly due to increased sea ice in the Southern Ocean (5). Abrupt aridification indicates that the westerlies shifted back to a position south of Australia after 8 Ma. Our midlatitude Southern Hemisphere data are consistent with the inference that expansion of sea ice around Antarctica resulted in a northward movement of the westerlies. In turn, this may have pushed tropical atmospheric circulation and the ITCZ northward, shifting the main precipitation belt over large parts of Southeast Asia (4).

Place, publisher, year, edition, pages
2017. Vol. 3, no 5, e1602567
Keyword [en]
Miocene, Australia, Southern Hemisphere, Westerlies, Hadley Cell, Precipitation
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-321896DOI: 10.1126/sciadv.1602567ISI: 000401955300027OAI: oai:DiVA.org:uu-321896DiVA: diva2:1095084
Funder
Swedish Research Council, 2016-04434German Research Foundation (DFG), GR 3528/3-1Swedish Research Council, 2011-4866Australian Research Council
Note

D. C. Potts & W. Zhang are part of the group Expedition 356 Scientists. For complete list of authors see https://doi.org/10.1126/sciadv.1602567

Available from: 2017-05-11 Created: 2017-05-11 Last updated: 2017-07-12Bibliographically approved

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