Cyclone behaviour response to changes in winter southern hemisphere sea‐ice concentration

Abstract

The sensitivity of climatological cyclone behaviour in the southern hemisphere to reductions in winter antarctic sea‐ice concentration is studies in general‐circulation‐model (GMC) experiments. An increase in the number of cyclones over most of the Weddell an Ross Seas is a response common to all cases of reduction of sea‐ice concentration from 100%. There is a tendency, particularly at lower ice concentrations, for more cyclones to be found in the latitude band of about 10 to 15° of latitude width centered on the antarctic coast, and a belt of fewer cyclones to the north. The structure of the changes in cyclogenesis assumes a much lesser zonally oriented form, and all experiments induce enh..