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Title: Holocene El Niño–Southern Oscillation variability reflected in subtropical Australian precipitation
Authors: Barr, C
Tibby, J
Leng, MJ
Tyler, JJ
Henderson, ACG
Overpeck, JT
Simpson, GL
Cole, JE
Phipps, SJ
Marshall, JC
McGregor, GB
Hua, Q
McRobie, FH
Keywords: Quaternary period
Southern Oscillation
Issue Date: 7-Feb-2019
Publisher: Springer Nature
Citation: Barr, C., Tibby, J., Leng, M. J., Tyler, J. J., Henderson, A. C. G., Overpeck, J. T., Simpson, G. L., Cole, J. E., Phipps, S. J., Marshall, J. C., McGregor, G. B., Hua, Q. & McRobie, F. H. (2019). Holocene El Niño–Southern Oscillation variability reflected in subtropical Australian precipitation. Scientific Reports, 9(1), 1-9. doi:10.1038/s41598-019-38626-3
Abstract: The La Niña and El Niño phases of the El Niño-Southern Oscillation (ENSO) have major impacts on regional rainfall patterns around the globe, with substantial environmental, societal and economic implications. Long-term perspectives on ENSO behaviour, under changing background conditions, are essential to anticipating how ENSO phases may respond under future climate scenarios. Here, we derive a 7700-year, quantitative precipitation record using carbon isotope ratios from a single species of leaf preserved in lake sediments from subtropical eastern Australia. We find a generally wet (more La Niña-like) mid-Holocene that shifted towards drier and more variable climates after 3200 cal. yr BP, primarily driven by increasing frequency and strength of the El Niño phase. Climate model simulations implicate a progressive orbitally-driven weakening of the Pacific Walker Circulation as contributing to this change. At centennial scales, high rainfall characterised the Little Ice Age (~1450–1850 CE) in subtropical eastern Australia, contrasting with oceanic proxies that suggest El Niño-like conditions prevail during this period. Our data provide a new western Pacific perspective on Holocene ENSO variability and highlight the need to address ENSO reconstruction with a geographically diverse network of sites to characterise how both ENSO, and its impacts, vary in a changing climate. © The Author(s) 2019, corrected publication 2021
Description: Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License. This article was updated by the Authors in 2021.
ISSN: 2045-2322
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