Post-glacial coupling of the Australasian monsoon and teleconnections to the North Atlantic: new insights from Indonesian speleothems

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dc.contributor.authorGriffiths, MLen_AU
dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorGagan, MKen_AU
dc.contributor.authorZhao, JKen_AU
dc.contributor.authorAyliffe, LKen_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorHantoro, WSen_AU
dc.contributor.authorFrisia, Sen_AU
dc.contributor.authorFeng, YXen_AU
dc.contributor.authorCartwright, Ien_AU
dc.contributor.authorSt Pierre, Een_AU
dc.contributor.authorFisher, Men_AU
dc.contributor.authorSuwargadi, Ben_AU
dc.date.accessioned2020-10-26T00:02:21Zen_AU
dc.date.available2020-10-26T00:02:21Zen_AU
dc.date.issued2009-05-15en_AU
dc.date.statistics2020-10-23en_AU
dc.description.abstractThe Australasian monsoon system orchestrates rainfall variability and terrestrial productivity in the densely populated region of the tropical Indo-Pacific. A clear understanding of the dominant mechanisms governing its variability has been difficult to resolve, partly because we currently lack high-resolution proxy records of past monsoon behaviour, particularly for the southern tropics. Here we provide a radiometrically dated reconstruction of Australian-Indonesian summer monsoon (AISM) rainfall based on oxygen isotopes and trace element data in stalagmites from southern Indonesia. The multi-proxy records are tied to age-depth models constructed from 62 TIMS and MC-ICP-MS U-series ages, covering the period 0 to 12.6 ka B.P. The record shows that the AISM was anti-phased with the East Asian summer monsoon (EASM) on orbital to millennial-centennial timescales over the past 12.6 ka. At the orbital-scale, local summer insolation was an important driver of opposing changes in AISM and EASM rainfall. However, a slight mismatch between the AISM and insolation from 9 to 11 ka B.P. is concurrent with the sharp rise in eustatic sealevel, which apparently increased the supply of northwesterly summer monsoon moisture to the Indonesian maritime continents. At millennial-centennial timescales, the oxygen isotope and trace element records show that periods of weakened North Atlantic meridional overturning circulation and cooling, including the Younger Dryas cold stage, are in phase with sharp increases in AISM rainfall. The connection between the AISM and a cooler North Atlantic is probably due to enhanced outflow from the Asian winter monsoon and associated southward migration of the intertropical convergence zone. These interhemispheric connections were dominant until ~6.5 ka, when the El NiƱo-Southern Oscillation became the governing influence on AISM variability.en_AU
dc.identifier.citationGriffiths, M., Drysdale, R., Gagan, M., Zhao, J.-x., Ayliffe, L., Hellstrom, J., Hantoro, W., Frisia, S., Feng, Y-x., Cartwright, I., St Pierre, E., Fischer, M., & Suwargadi, B. (2009). Post-glacial coupling of the Australasian monsoon and teleconnections to the North Atlantic: new insights from Indonesian speleothems. Paper presented at the Past Climates meeting, Wellington New Zealand, May 15-17, 2009.en_AU
dc.identifier.conferenceenddate17 May 2009en_AU
dc.identifier.conferencenamePast Climates meetingen_AU
dc.identifier.conferenceplaceWellington, New Zealanden_AU
dc.identifier.conferencestartdate15 May 2009en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/9941en_AU
dc.language.isoenen_AU
dc.publisherGNS Scienceen_AU
dc.subjectAustraliaen_AU
dc.subjectMonsoonsen_AU
dc.subjectRainen_AU
dc.subjectTropical regionsen_AU
dc.subjectElementsen_AU
dc.subjectTrace amountsen_AU
dc.subjectIndonesiaen_AU
dc.subjectAsiaen_AU
dc.subjectSouthern Oscillationen_AU
dc.titlePost-glacial coupling of the Australasian monsoon and teleconnections to the North Atlantic: new insights from Indonesian speleothemsen_AU
dc.typeConference Presentationen_AU
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