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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 OscillationAgricultural production across eastern Australia and New Zealand is highly vulnerable to drought, but there is a dearth of observational drought information prior to CE (Christian Era) 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 percent 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.
Document ID
20170005254
Document Type
Reprint (Version printed in journal)
Authors
Palmer, Jonathan G. (New South Wales Univ. Sydney, Australia)
Cook, Edward R. (Lamont-Doherty Earth Observatory Palisades, NY, United States)
Turney, Chris S. M. (New South Wales Univ. Sydney, Australia)
Allen, Kathy (Melbourne Univ. Victoria, Australia)
Fenwick, Pavla (Auckland Univ. New Zealand)
Cook, Benjamin I. (Lamont-Doherty Earth Observatory Palisades, NY, United States)
O'Donnell, Alison (Western Australia Univ. Crawley, Australia)
Lough, Janice (Australian Inst. of Marine Science Townsville, Australia)
Grierson, Pauline (Western Australia Univ. Crawley, Australia)
Baker, Patrick (Melbourne Univ. Victoria, Australia)
Date Acquired
June 7, 2017
Publication Date
November 23, 2015
Publication Information
Publication: Environmental Research Letters
Volume: 10
Issue: 12
ISSN: 1748-9326
Subject Category
Meteorology and Climatology
Report/Patent Number
GSFC-E-DAA-TN28460
Funding Number(s)
CONTRACT_GRANT: ARC DP130104156
CONTRACT_GRANT: ARC FT120100715
CONTRACT_GRANT: ARC LP120100310
CONTRACT_GRANT: ARC DP120104320
CONTRACT_GRANT: ARC FL100100195
CONTRACT_GRANT: ARC LP120200811
Distribution Limits
Public
Copyright
Other