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Monsoon-like Southwest Australian Circulation Index (SWACI)
The monsoon-like southwest Australian circulation (SWAC) index is defined as an area-averaged dynamical normalized seasonality (DNS) at 850 hPa within the southwest Austrailan circulation domain (35°-25°S, 100°-145°E) (Li and Zeng, 2002; Feng et al., 2010). There is an apparent significant correlation between the SWACI and rainfall in the southwest Western Australia (SWWA) in both early and late winter, indicating drought years over the SWWA are associated with the weak SWAC.
The Southwest Australian Circulation Index (SWACI)
The normalized time series of SWACI during the austral (a) early winter (May to July), (b) late winter (August to October), and (c) winter half year (May to October) for the period of 1948-2010. The thick solid lines indicate 9-year Gaussian-type filtered values.
Correlation maps between the SWACI and Australian rainfall during (a) early winter (May to July), (b) late winter (August to October), and (c) winter half year (May to October) during 1948-2007. The shaded areas indicate significant at the 95% confidence level.
Related
References
Feng, J., J. Li, and Y. Li, 2010: A monsoon-like Southwest Australian circulation and its relation with rainfall in Southwest Western Australia. J. Climate, 23: 1334-1353. Electronic version PDF
Li, J. and Q. Zeng, 2005: A new monsoon index, its interannual variability and relation with monsoon precipitation. Climatic and Environmental Research, 10(3): 351-365. Electronic version PDF
Li, J. and Q. Zeng, 2003: A new monsoon index and the geographical distribution of the global monsoons, Adv. Atmos. Sci., 20, 299-302. Electronic version PDF
Li, J. and Q. Zeng, 2002: A unified monsoon index, Geophysical Research Letters, 29(8), 1274, doi:10.1029/2001GL013874. Electronic version PDF
Li, J., and Q. Zeng, 2000: Significance of the normalized seasonality of wind field and its rationality for characterizing the monsoon, Science in China (D), 43(6): 647-653. Electronic version PDF
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The Monthly Southwest Australian Circulation Index (SWACI) Data |
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4 kilobytes |
Southwest Australian Circulation Index (SWACI) |
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You can download this file from here (right-click then select "Save Target As" or "Save Link As"). |
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File format |
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for year = 1948 to 2010 format (1x, i4, 14f8.3) year, May, Jun, Jul, Aug Sep, Oct and extended winter (MJJASO) raw values, May, Jun, Jul, Aug, Sep, Oct and extended winter (MJJASO) normalized values |
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Note: Missing values represented by 99.99. |
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The Daily Southwest Australian Circulation Index (SWACI) Data will soon be available |
Last updated: 2011-03-08 (Jianping Li: ljp@lasg.iap.ac.cn)