A 5.3-Million-Year History of Monsoonal Precipitation in Northwestern Australia

Jan Berend W. Stuut*, Patrick De Deckker, Mariem Saavedra-Pellitero, Franck Bassinot, Anna Joy Drury, Maureen H. Walczak, Kana Nagashima, Masafumi Murayama

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

New proxy records from deep-sea sediment cores from the northwestern continental margin of Western Australian reveal a 5.3 million year (Ma) history of aridity and tropical monsoon activity in northwestern Australia. Following the warm and dry early Pliocene (~5.3 Ma), the northwestern Australian continent experienced a gradual increase in humidity peaking at about 3.8 Ma with higher than present-day rainfall. Between 3.8 and about 2.8 Ma, climate became progressively more arid with more rainfall variability. Coinciding with the onset of the Northern Hemisphere glaciations and the intensification of the Northern Hemisphere monsoon, aridity continued to increase overall from 2.8 Ma until today, with greater variance in precipitation and an increased frequency of large rainfall events. We associate the observed large-scale fluctuations in Australian aridity with variations in Indian Ocean sea surface temperatures, which largely control the monsoonal precipitation in northwestern Australia.

Original languageEnglish
Pages (from-to)6946-6954
Number of pages9
JournalGeophysical Research Letters
Volume46
Issue number12
Early online date10 Jun 2019
DOIs
Publication statusPublished - 28 Jun 2019

Keywords

  • Australia
  • monsoon
  • paleoclimate
  • Pliocene
  • Quaternary
  • runoff

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