An objective scheme (described in Part I) has been used to study the distribution and movement of southern hemisphere extratropical cyclones generated by a general circulation model for January and July. The model cyclones reproduced a number of the important features of cyclone behaviour reported from earlier observational studies. Systems moved in the expected east-southeast direction, with maximum speeds in mid-latitudes. The circumpolar trough and the major Antarctic embayments were found to be regions of maximum cyclone density and of net dissipation. Contrary to earlier findings they were also found to be regions of active local cyclogenesis. The model results appear to correspond rather more closely to the distribution revealed from recent ECMWF analyses than from earlier studies. -Authors
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Murray et al. (2000) studied this question.