Queensland’s multi-year Wet and Dry periods: implications for grazing enterprises and pasture resources
G. McKeon A , G. Stone A E , D. Ahrens A , J. Carter B , D. Cobon C , S. Irvine A and J. Syktus A D
+ Author Affiliations
- Author Affiliations
A Grazing Land Systems, Queensland Department of Environment and Science, Brisbane, Qld 4001, Australia.
B Remote Sensing Centre, Queensland Department of Environment and Science, Brisbane, Qld 4001, Australia.
C Centre for Applied Climate Sciences, University of Southern Queensland, Toowoomba, Qld 4350, Australia.
D School of Biological Sciences, University of Queensland, Qld 4072, Australia.
E Corresponding author. Email: Grant.Stone@qld.gov.au
The Rangeland Journal 43(3) 121-142 https://doi.org/10.1071/RJ20089
Submitted: 3 September 2020 Accepted: 6 May 2021 Published: 23 August 2021
Journal Compilation © Australian Rangeland Society 2021 Open Access CC BY-NC-ND
Abstract
Year-to-year variability in rainfall has long been recognised as a major issue in managing livestock enterprises across Australia’s grazing lands. Extension products documenting rainfall variability have been developed over the last 30 years and have been keenly sought by producers and their advisors. This paper describes multi-year rainfall variability from 1889 to 2020 and provides the basis for classifying the 131 years of rainfall into 18 discrete Wet (7), Average (2) and Dry (9) periods as presented in the ‘Queensland’s Extended Wet and Dry Periods’ poster. The classification was consistent with: analysis of fluctuations and trends in the long-term time series of reported livestock numbers; drought declarations for government assistance; and documented periods of pasture resource degradation and recovery. Rainfall during the nine Wet and Average periods was +18% above the long-term average annual rainfall (LTAAR), in contrast to the Dry periods with −17% below LTAAR. Wet periods (including Average) were on average 7 years in duration, ranging from 5 to 9 years. Dry periods were on average 8 years in duration and ranged from 5 to 13 years. Detailed analysis of the effects of the El Niño Southern Oscillation (ENSO) phenomenon indicated that: (a) the Wet/Dry periods were dominated by different frequencies and amounts of rainfall in La Niña/El Niño years; (b) rainfall in ENSO neutral years was generally above and below average rainfall for the Wet or Dry periods respectively; (c) the frequency of ENSO year-types was less important than the overall rainfall surplus (or deficit) in La Niña (or El Niño) years within the Wet (or Dry) periods respectively; and (d) the timing of Wet and Dry periods was correlated with indices of quasi-decadal and inter-decadal variability in components (sea surface temperatures and atmospheric pressures) of the global climate system. Climatic risk assessment systems for grazing management at multi-year timescales are yet to be developed.
Keywords: rainfall variability, drought, El Niño Southern Oscillation, ENSO, El Niño, La Niña, quasi-decadal, Inter-decadal Pacific Oscillation, degradation, pasture recovery, livestock production.
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