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Climate Dynamics

, Volume 36, Issue 7–8, pp 1419–1429 | Cite as

Australian east coast rainfall decline related to large scale climate drivers

  • Milton Samuel Speer
  • Lance M. Leslie
  • Alexandre O. Fierro
Article

Abstract

Rainfall on the subtropical east coast of Australia has declined at up to 50 mm per decade since 1970. Wavelet analysis is used to investigate eight station and four station-averaged rainfall distributions along Australia’s subtropical east coast with respect to the El Niño-Southern Oscillation (ENSO), the inter-decadal Pacific oscillation (IPO) and the southern annular mode (SAM). The relationships are examined further using composite atmospheric circulation anomalies. Here we show that the greatest rainfall variability occurs in the 15–30 year periodicity of the 1948–1975 or ‘cool’ phase of the IPO when the subtropical ridge is located sufficiently poleward for anomalous moist onshore airflow to occur together with high ENSO rainfall variability and high, negative phase, SAM variability. Thus, the mid-latitude westerlies are located at their most equatorward position in the Australian region. This maximizes tropospheric interaction of warm, moist tropical air with enhanced local baroclinicity over the east coast, and hence rainfall.

Keywords

Rainfall variability Large scale Climate drivers East Australia 

Notes

Acknowledgments

This work was financially supported through the Australian Academy of Science under the Scientific Visits to North America program. Wavelet software was provided by C. Torrence and G. Compo, and is available at URL: http://paos.colorado.edu/research/wavelets/.

Supplementary material

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Supplementary material 1 (TIFF 8.22 mb)
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Supplementary material 2 (JPEG 1.49 mb)
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Supplementary material 3 (TIFF 2.40 mb)
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Supplementary material 4 (TIFF 2.40 mb)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Milton Samuel Speer
    • 1
  • Lance M. Leslie
    • 2
    • 3
  • Alexandre O. Fierro
    • 4
  1. 1.Faculty of Science, Climate Change Research CentreThe University of New South WalesSydneyAustralia
  2. 2.Cooperative Institute for Mesoscale Meteorological Studies and School of MeteorologyThe University of OklahomaNormanUSA
  3. 3.Australian Sustainable Development InstituteCurtin UniversityPerthAustralia
  4. 4.NOAA/Hurricane Research DivisionAtlantic Oceanographic Meteorological LaboratoryMiamiUSA

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