Open Access Repository

Holocene El Niño–Southern Oscillation variability reflected in subtropical Australian precipitation

Downloads

Downloads per month over past year

Barr, C, Tibby, J, Leng, MJ, Tyler, JJ, Henderson, ACG, Overpeck, JT, Simpson, GL, Cole, JE, Phipps, SJ ORCID: 0000-0001-5657-8782, Marshall, JC, McGregor, GB, Hua, Q and McRobie, FH 2019 , 'Holocene El Niño–Southern Oscillation variability reflected in subtropical Australian precipitation' , Scientific Reports, vol. 9 , pp. 1-9 , doi: 10.1038/s41598-019-38626-3.

[img]
Preview
PDF
130741 - Holoce...pdf | Download (2MB)

| Preview

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.

Item Type: Article
Authors/Creators:Barr, C and Tibby, J and Leng, MJ and Tyler, JJ and Henderson, ACG and Overpeck, JT and Simpson, GL and Cole, JE and Phipps, SJ and Marshall, JC and McGregor, GB and Hua, Q and McRobie, FH
Keywords: ENSO, El Nino-Southern Oscillation, Holocene, climate variability, subtropics, Australia, precipitation
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
DOI / ID Number: 10.1038/s41598-019-38626-3
Copyright Information:

Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

Related URLs:
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP