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Drought variability in the eastern Australia and New Zealand summer drought atlas (ANZDA, CE 1500-2012) modulated by the Interdecadal Pacific Oscillation

Citation

Palmer, JG and Cook, ER and Turney, CSM and Allen, K and Fenwick, P and Cook, BI and O'Donnell, A and Lough, J and Grierson, P and Baker, P, Drought variability in the eastern Australia and New Zealand summer drought atlas (ANZDA, CE 1500-2012) modulated by the Interdecadal Pacific Oscillation, Environmental Research Letters, 10, (12) Article 124002. ISSN 1748-9326 (2015) [Refereed Article]


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DOI: doi:10.1088/1748-9326/10/12/124002

Abstract

Agricultural production across eastern Australia and New Zealand is highly vulnerable to drought, but there is a dearth of observational drought information prior to CE 1850. Using a comprehensive network of 176 drought-sensitive tree-ring chronologies and one coral series, we report the first Southern Hemisphere gridded drought atlas extending back to CE 1500. The austral summer (December-February) Palmer drought sensitivity index reconstruction accurately reproduces historically documented drought events associated with the first European settlement of Australia in CE 1788, and the leading principal component explains over 50% of the underlying variance. This leading mode of variability is strongly related to the Interdecadal Pacific Oscillation tripole index (IPO), with a strong and robust antiphase correlation between (1) eastern Australia and the New Zealand North Island and (2) the South Island. Reported positive, negative, and neutral phases of the IPO are consistently reconstructed by the drought atlas although the relationship since CE 1976 appears to have weakened. © 2015 IOP Publishing Ltd.

Item Details

Item Type:Refereed Article
Keywords:gridded summer drought atlas, eastern Australia, palaeoclimatology, Interdecadal Pacific Oscillation, IPO, multi-decadal hydroclimate variability
Research Division:Earth Sciences
Research Group:Climate change science
Research Field:Climatology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Allen, K (Dr Kathy Allen)
ID Code:144248
Year Published:2015
Web of Science® Times Cited:76
Deposited By:Geography and Spatial Science
Deposited On:2021-05-04
Last Modified:2021-05-04
Downloads:0

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