92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Tuesday, 24 January 2012
Regional Characteristics Analysis of Drought Climatology in Australia Using the Effective Drought Index
Hall E (New Orleans Convention Center )
Ji-Sun Lee, Pukyong National University, Busan, South Korea; and H. R. Byun

The drought climatology of Australia from 1920 to 2009 was analyzed using the Effective Drought Index (EDI). First, Australia is divided into five subregions based on hierarchical cluster analysis of the monthly minimum EDI: (G1) Northern Territory, (G2) Queensland, (G3) Western Australia, (G4) Southern Australia, (G5) Eastern Australia. Next, to grasp quickly and easily the spatiotemporal information of droughts occurred at each subregion, a drought temporal map was constructed into one chart using the time series of daily EDI. The drought temporal map shows the following regional characteristics. 1) The most extreme and longest drought is observed in Northern Territory (G1) from 13 Nov 1950 to 30 Nov 1953. But severe droughts (EDI ≤ -1.5) have not almost occurred since 1971 in this region. 2) On the other hand, frequency of droughts in southern regions (G3, G4, G5) tends to increase from 2002 drought which one of the most severe and widespread droughts. Especially, duration and frequency of droughts generated in G4 was longer and more than in other region.

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