Monitoring Australian Monsoon variability over the past four glacial cycles

Type Article
Date 2021-04
Language English
Author(s) Pei Renjie1, Kuhnt Wolfgang1, Holbourn Ann1, Hingst Johanna1, 2, Koppe Matthias1, Schultz Jan1, Kopetz Peer1, Zhang Peng3, Andersen Nils4
Affiliation(s) 1 : Institute for Geosciences, Kiel University, Ludewig-Meyn Str. 10-14, 24118 Kiel, Germany
2 : MARUM, University of Bremen University, Leobener Str. 8, 28359 Bremen, Germany
3 : State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
4 : Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Kiel University, Max-Eyth-Str. 11-13, 24118 Kiel, Germany
Source Palaeogeography Palaeoclimatology Palaeoecology (0031-0182) (Elsevier BV), 2021-04 , Vol. 568 , P. 110280 (14p.)
DOI 10.1016/j.palaeo.2021.110280
WOS© Times Cited 11
Keyword(s) ITCZ, Glacial terminations, Dust, Terrigenous discharge, Oxygen isotopes, X-Ray fluorescence

We analyse changes in terrigenous sedimentation along the northwestern Australian margin to monitor the latitudinal migration of the Intertropical Convergence Zone (ITCZ) and the shifting boundaries of climatic belts during the last four glacial cycles. We integrate high-resolution X-ray fluorescence (XRF) scanning elemental records from Core SO257–18548 and International Ocean Discovery Program Site U1482, situated southwest of the Scott Plateau at the southern edge of the present-day monsoonal belt, and from Core SO257–18571, located within the dust-cyclone belt offshore Northwest Cape south of the Exmouth Plateau. The chronology of these sediment successions is based on 14C dating over the last glacial termination and on correlation of the benthic oxygen isotope record to the LR04 stack (Lisiecki and Raymo, 200) and Antarctic ice core chronology. Our XRF derived records of riverine terrigenous run-off and aeolian dust input reveal rapid intensification of monsoonal precipitation and reduction of atmospheric dust during the Younger Dryas and early Holocene as well as during the terminal phase of other major deglaciations. Short-lived monsoonal maxima in the early Holocene (~10 ka), MIS 5e (~130 ka), MIS 7 (~200, ~220 and ~ 240 ka), and MIS 9 (~280, ~305 and ~ 330 ka) coincide with maxima in atmospheric carbon dioxide and methane concentrations. Monsoon intensification occurs during maxima in Southern Hemisphere spring (September) insolation, when intense heat low pressure cells over the Pilbara region trigger the southward shift of the ITCZ. Within the dust-cyclone belt, riverine sediment discharge was restricted to intervals of high atmospheric CO2 concentrations, when sea surface temperature thresholds promoted cyclone formation in the tropical Indian Ocean. Northwestern Australia remained dry and arid during MIS 5a-d, when the ITCZ was locked in a more northerly position and temperature thresholds were not attained.

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Pei Renjie, Kuhnt Wolfgang, Holbourn Ann, Hingst Johanna, Koppe Matthias, Schultz Jan, Kopetz Peer, Zhang Peng, Andersen Nils (2021). Monitoring Australian Monsoon variability over the past four glacial cycles. Palaeogeography Palaeoclimatology Palaeoecology, 568, 110280 (14p.). Publisher's official version : , Open Access version :