Indo-Pacific hydroclimate over the past millennium and links with global climate variability

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dc.contributor.authorGriffiths, MLen_AU
dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorKimbrough, AKen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorJohnson, KRen_AU
dc.contributor.authorGagan, MKen_AU
dc.contributor.authorCole, JEen_AU
dc.contributor.authorCook, BIen_AU
dc.contributor.authorZhao, JXen_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorHantoro, WSen_AU
dc.date.accessioned2020-03-23T03:10:19Zen_AU
dc.date.available2020-03-23T03:10:19Zen_AU
dc.date.issued2016-01-01en_AU
dc.date.statistics2020-03-20en_AU
dc.description.abstractThe El Niño-Southern Oscillation (ENSO) and Interdecadal Pacific Oscillation (IPO) are the dominant modes of hydroclimate variability in the tropical Pacific and have far-reaching impacts on Earth’s climate. Experiments combining instrumental records with climate-model simulations have highlighted the dominant role of the Pacific Walker circulation in shaping recent trends in global temperatures (Kosaka and Xie, 2013, 2016). However, the paucity of high-resolution terrestrial paleoclimate records of deep atmospheric convection over the Indo-Pacific Warm Pool (IPWP) precludes a comprehensive assessment as to role of the tropical Pacific in modulating radiative-forced shifts in global temperature on multidecadal to centennial timescales. Here we present a suite of new high-resolution oxygen-isotope records from Indo-Pacific speleothems, which, based on modern rainfall and cave drip-water monitoring studies, along with trace element (Mg/Ca, Sr/Ca) analyses, are interpreted to reflect changes in Australasian monsoon variability during the Common Era (C.E.). Our results reveal a protracted decline in southern Indonesian monsoon rainfall between ~1000-1400 C.E. but stronger between ~1500-1900 C.E. These centennial-scale patterns over southern Indonesia are consistent with other proxy records from the region but anti-phased with records from India and China, supporting the paradigm that Northern Hemisphere cooling increased the interhemispheric thermal gradient, displacing the Australasian ITCZ southward. However, our findings are also compatible with a recent synthesis of paleohydrologic records for the Australasian monsoon region, which, collectively, suggest that rather than moving southward during the LIA, the latitudinal range of monsoon-ITCZ migration probably contracted equatorward (Yan et al., 2015). This proposed LIA ITCZ contraction likely occurred in parallel with a strengthening of the Walker circulation (as indicated through comparison with our hydroclimate records from the central-eastern equatorial Pacific Ocean and western Indian Ocean, and eastern Australia), and thus, the tropical Pacific may have played a critical role in amplifying the radiative-forced global cooling already underway. © 2016. American Geophysical Unionen_AU
dc.identifier.citationGriffiths, M. L., Drysdale, R., Kimbrough, A. K., Hua, Q., Johnson, K. R., Gagan, M. K., Cole, J. E., Cook, B. I., Zhao, J. X., Hellstrom, J. C., & Hantoro, W. S. (2016). Indo-Pacific hydroclimate over the past millennium and links with global climate variabilty. Paper presented at the AGU Fall Meeting, San Fransisco, 12-16 December 2016. Retrieved from" https://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/139823en_AU
dc.identifier.conferenceenddate16 December 1016en_AU
dc.identifier.conferencenameAGU Fall Meeting 2016en_AU
dc.identifier.conferenceplaceSan Fransisco, Californiaen_AU
dc.identifier.conferencestartdate12 December 2016en_AU
dc.identifier.govdoc7734en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/139823en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9189en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectSouthern Oscillationen_AU
dc.subjectPacific Oceanen_AU
dc.subjectClimatesen_AU
dc.subjectTropical regionsen_AU
dc.subjectMathematical modelsen_AU
dc.subjectClimatic changeen_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectAmbient temperatureen_AU
dc.subjectClimate modelsen_AU
dc.subjectRadiative forcingen_AU
dc.subjectOxygen isotopesen_AU
dc.subjectAtmospheric precipitationsen_AU
dc.titleIndo-Pacific hydroclimate over the past millennium and links with global climate variabilityen_AU
dc.typeConference Presentationen_AU
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