Meteorology and Atmospheric Physics

, Volume 89, Issue 1–4, pp 57–67 | Cite as

A new approach to detection of anthropogenic temperature changes in the Australian region

  • D. J. Karoly
  • K. Braganza
Article

Summary

A new method has been applied for detecting a human influence on regional temperature changes in Australia over the last 50 years, including the whole of Australia, the southern half of Australia and the southeastern sector of Australia. There was a strong relationship between interannual variations of rainfall and temperature in different regions in Australia. The rainfall-related component of the temperature variations was removed using linear regression and the residual temperature variations were much smaller for maximum and mean temperature, and diurnal temperature range. Model simulations of regional temperature and rainfall variations agreed reasonably well with observations.

Trends in the residual variations of maximum, mean and minimum temperature over the last 50 years could not be explained by natural climate variations in all the regions considered and were consistent with the response to increasing greenhouse gases and sulphate aerosols in the climate models. This new approach has been able to enhance the signal-to-noise ratio for anthropogenic temperature change signals in the Australian region and to show that there is a clear anthropogenic warming signal in observed regional temperature trends, even for regions as small as the southeastern sector of Australia.

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References

  1. Bell, J, Duffy, PB, Covey, C, Sloan, L 2000Comparison of temperature variability in observations and sixteen climate model simulations.Geophys Res Lett27261264CrossRefGoogle Scholar
  2. Braganza, K, Karoly, DJ, Arblaster, J 2004Diurnal temperature range as an index of global climate change during the twentieth century.Geophys Res Lett3113217CrossRefGoogle Scholar
  3. Dai, A, Trenberth, KE, Karl, TR 1999Effects of clouds, soil moisture, precipitation and water vapor on diurnal temperature range.J Climate1224512473CrossRefGoogle Scholar
  4. Della-Marta, PM, Collins, DA, Braganza, K 2004Updating Australia’s high-quality annual temperature dataset.Aust Meteor Mag537593Google Scholar
  5. Flato, GM, Boer, GJ 2001Warming asymmetry in climate change simulations.Geophys Res Lett28195198CrossRefGoogle Scholar
  6. Giorgi F, Hewitson B, Christensen J, Hulme M, Von Storch H, Whetton P, Jones R, Mearns L, Fu C (2001) Regional climate information – evaluation and projections. In: Climate change 2001: The scientific basis. Contribution of Working Group I to the 3rd Assessment Report of the Intergovernmental Panel on Climate Change (Houghton JT et al, eds). Cambridge: Cambridge University Press, pp 583–638Google Scholar
  7. IPCC (2001) Climate change 2001: Synthesis report. Contribution of the Working Groups I, II, and III to the 3rd Assessment Report of the Intergovernmental Panel on Climate Change (Watson RT and the Core Writing Team, eds). Cambridge: Cambridge University Press, 398 ppGoogle Scholar
  8. Karoly, DJ, Braganza, K 2005Attribution of recent temperature changes in the Australian region.J Climate18457464CrossRefGoogle Scholar
  9. Karoly, DJ, Braganza, K, Stott, PA, Arblaster, JM, Meehl, GA, Broccoli, AJ, Dixon, KW 2003Detection of a human influence on North American climate.Science30212001203CrossRefPubMedGoogle Scholar
  10. Lavery, B, Kariko, A, Nicholls, N 1992A historical rainfall data set for Australia.Aust Met Mag403339Google Scholar
  11. Lavery, B, Joung, G, Nicholls, N 1997An extended high-quality historical rainfall dataset for Australia.Aust Met Mag462738Google Scholar
  12. McAvaney BJ, Covey C, Joussaume S, Kattsov V, Kitoh A, Ogana W, Pitman AJ, Weaver AJ, Wood RA, Zhao Z-C (2001) Model evaluation. In: Climate change 2001: The scientific basis. Contribution of Working Group I to the 3rd Assessment Report of the Intergovernmental Panel on Climate Change (Houghton JT et al, eds). Cambridge: Cambridge University Press, pp 471–523Google Scholar
  13. Mitchell JFB, Karoly DJ, Allen MR, Hegerl G, Zwiers F, Marengo J (2001) Detection of climate change and attribution of causes. In: Climate change 2001: The scientific basis. Contribution of Working Group I to the 3rd Assessment Report of the Intergovernmental Panel on Climate Change (Houghton JT et al, eds). Cambridge: Cambridge University Press, pp 695–738Google Scholar
  14. Narisma, GT, Pitman, AJ 2003The impact of 200 years of land cover change on the Australian near-surface climate.J Hydromet4424436CrossRefGoogle Scholar
  15. Nicholls, N 2003Continued anomalous warming in Australia.Geophys Res Lett301370CrossRefGoogle Scholar
  16. Nicholls, N 2004The changing nature of Australian droughts.Clim Change63323336CrossRefGoogle Scholar
  17. Plummer, N, Lin, Z, Torok, S 1995Trends in the diurnal temperature range over Australia since 1951.Atmos Res377986CrossRefGoogle Scholar
  18. Power, S, Tseitkin, F, Torok, S, Lavery, B, McAvaney, B 1998Australian temperature, Australian rainfall, and the Southern Oscillation, 1910–1996: Coherent variability and recent changes.Aust Meteorol Mag4785101Google Scholar
  19. Stott PA (2003) Attribution of regional-scale temperature changes to anthropogenic and natural causes. Geophys Res Lett 30 (DOI: 10.1029/2003GL017324)Google Scholar
  20. Stott, PA, Tett, SFB 1998Scale-dependent detection of climate change.J Climate1132823294CrossRefGoogle Scholar
  21. Stott, PA, Tett, SFB, Jones, GS, Allen, MR, Mitchell, JFB, Jenkins, GJ 2000External control of 20th century temperature by natural and anthropogenic forcings.Science29021332137CrossRefPubMedGoogle Scholar
  22. Tett, SFB, Stott, PA, Allen, MR, Ingram, WJ, Mitchell, JFB 1999Causes of twentieth-century temperature change near the Earth’s surface.Nature399569572CrossRefGoogle Scholar
  23. Torok, SJ, Nicholls, N 1996An historical annual temperature data set for Australia.Aust Meteor Mag45251260Google Scholar
  24. Watterson IG, Dix MR (2003) Simulated changes due to global warming in daily precipitation means and extremes and their interpretation using the gamma distribution. J Geophys Res 108 (DOI: 10.1029/2002JD002928)Google Scholar
  25. Zwiers, FW, Zhang, X 2003Towards regional climate change detection.J Climate16793797CrossRefGoogle Scholar

Copyright information

© Springer-Verlag/Wien 2005

Authors and Affiliations

  • D. J. Karoly
    • 1
  • K. Braganza
    • 2
  1. 1.School of Meteorology, University of OklahomaNormanUSA
  2. 2.School of Mathematical Sciences, Monash UniversityClaytonAustralia

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