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

doi:10.1016/j.epsl.2019.01.045

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

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

38 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 language	English (US)
Pages (from-to)	103-112
Number of pages	10
Journal	Earth and Planetary Science Letters
Volume	513
DOIs	https://doi.org/10.1016/j.epsl.2019.01.045
State	Published - 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

Keywords

Australasian monsoon
Indonesia
Maritime Continent
oxygen isotopes
speleothem

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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

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.",

keywords = "Australasian monsoon, Indonesia, Maritime Continent, oxygen isotopes, speleothem",

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

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: {\textcopyright} 2019",

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AU - Gagan, Michael K.

AU - Dunbar, Gavin B.

AU - Hantoro, Wahyoe S.

AU - Hellstrom, John C.

AU - Cheng, Hai

AU - Edwards, R. Lawrence

AU - Suwargadi, Bambang W.

AU - Abram, Nerilie J.

AU - Rifai, Hamdi

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N2 - 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.

AB - 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.

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KW - speleothem

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JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

ER -

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

Abstract

Bibliographical note

Keywords

UN SDGs

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