An assessment of relationships between the Australian subtropical ridge, rainfall variability, and high-latitude circulation patterns

Williams, Allyson A. J. and Stone, Roger C. (2009) An assessment of relationships between the Australian subtropical ridge, rainfall variability, and high-latitude circulation patterns. International Journal of Climatology, 29 (5). pp. 691-709. ISSN 0899-8418

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Abstract

The monthly anomaly of the latitude of the subtropical ridge over eastern Australia (L) is a major regulator of synoptic-scale influences on Australia’s climate. Three datasets have been used to calculate L: observed Australia coastal mean sea level pressure (MSLP), Hadley and NCEP Reanalysis datasets. The choice of datasets used in this study appears to strongly influence results. Changes in the Southern Hemisphere Hadley cell and meridional circulation changes are associated with changes in L and it is shown that (1) L has statistically and physically significant relationships with seasonal rainfall in Australia; (2) the Antarctic Oscillation Index (AOI) has statistically significant relationships with Australian seasonal rainfall; and (3) L and Southern Annular Mode (SAM) are significantly related. Longer-term latitudinal shifts in L are also discussed.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version deposited in accordance with the copyright policy of the publisher. This is the author-version of the work. It is posted here for your personal use only. Please refer to the journal for the definitive, published version.
Depositing User: epEditor USQ
Faculty / Department / School: Current - USQ Other
Date Deposited: 15 Jun 2009 02:47
Last Modified: 08 Aug 2014 02:07
Uncontrolled Keywords: subtropical ridge; SAM; solar; Australia; rainfall
Fields of Research (FOR2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040107 Meteorology
01 Mathematical Sciences > 0103 Numerical and Computational Mathematics > 010301 Numerical Analysis
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9602 Atmosphere and Weather > 960202 Atmospheric Processes and Dynamics
D Environment > 96 Environment > 9603 Climate and Climate Change > 960307 Effects of Climate Change and Variability on Australia (excl. Social Impacts)
Identification Number or DOI: doi: 10.1002/joc.1732
URI: http://eprints.usq.edu.au/id/eprint/4710

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