Spatio-temporal evolution of Australasian monsoon hydroclimate over the last 40,000 years

Claire E. Krause, Michael K. Gagan, Gavin B. Dunbar, Wahyoe S. Hantoro, John C. Hellstrom, Hai Cheng, R. Lawrence Edwards, Bambang W. Suwargadi, Nerilie J. Abram, Hamdi Rifai

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Maritime Continent (MC) convection drives zonal and meridional climate modes, including the Australasian monsoon system, but its role in past global climate change remains uncertain. Here we use speleothem oxygen isotope (δ 18 O) records from a latitudinal transect across the MC, and a new critically located record for southwest Sulawesi, Indonesia, to reconstruct spatial hydroclimate variability in the Australasian monsoon domain over the last 40,000 yr. Our results show that atmospheric convection in the core MC region was reduced from ∼40,000 to 12,000 yr ago and strengthened rapidly only after the inundation of shallow continental shelves in the region, well after the onset of deglaciation. Interestingly, the millennial-scale climatic impacts of North Atlantic Heinrich events are not evident in Sulawesi. Together with climate model simulations, we demonstrate that changes in deep atmospheric convection dominate glacial–interglacial hydroclimate over the MC, whereas latitudinal shifts in the mean location of the InterTropical Convergence Zone control rainfall patterns during abrupt climate changes.

Original languageEnglish (US)
Pages (from-to)103-112
Number of pages10
JournalEarth and Planetary Science Letters
Volume513
DOIs
StatePublished - May 1 2019

Bibliographical note

Funding Information:
This study was supported by Australian Research Council (ARC) Discovery grants DP0663274 and DP1095673 to M.K.G., J.C.H., W.S.H., R.L.E, and H.C.; an Australian Postgraduate Award to C.E.K.; an ARC Future Fellowship to J.C.H. (FT130100801); an ARC Queen Elizabeth II fellowship to N.J.A. (DP110101161); U.S. NSF grants (1103402) and (1702816) to R.L.E. and H.C.; and National Natural Science Foundation of China grants to H.C. (NSFC 41731174 and 41888101).

Funding Information:
This study was supported by Australian Research Council (ARC) Discovery grants DP0663274 and DP1095673 to M.K.G., J.C.H., W.S.H., R.L.E, and H.C.; an Australian Postgraduate Award to C.E.K.; an ARC Future Fellowship to J.C.H. ( FT130100801 ); an ARC Queen Elizabeth II fellowship to N.J.A. ( DP110101161 ); U.S. NSF grants ( 1103402 ) and ( 1702816 ) to R.L.E. and H.C.; and National Natural Science Foundation of China grants to H.C. (NSFC 41731174 and 41888101 ).

Publisher Copyright:
© 2019

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

  • Australasian monsoon
  • Indonesia
  • Maritime Continent
  • oxygen isotopes
  • speleothem

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