Southern Hemisphere Tropical Cyclone Trends Flat to Down
Kuleshov, Y., Fawcett, R., Qi, L., Trewin, B., Jones, D., McBride, J. and Ramsay, H. 2010. Trends in tropical cyclones in the South Indian Ocean and the South Pacific Ocean. Journal of Geophysical Research 115: 10.1029/2009JD012372.
As seen in the figure below, there are simply no trends in their data, and the authors conclude that "for the 1981-1982 to 2006-2007 period, there are no apparent trends in the total numbers of TCs reaching minimum central pressures of 995 hPa or lower, nor in the numbers of severe TCs in the five subdomains of the SH examined."
Annual numbers of tropical cyclones with lifetime minimum central pressure of 995 hPa or lower for the SH (Southern Hemisphere) (squares, right axis), SIO (Southern Indian Ocean) (diamonds, left axis), SPO (South Pacific Ocean) (circles, right axis), and AR (Australian Region) (triangles, left axis), 1981-1982 to 2006-2007 seasons, with linear trends (from Kuleshov et al., 2010)
Contrary to expectations of global warming alarmists, who claim that the Earth has experienced unprecedented global warming over the past few decades, tropical cyclones and severe tropical cyclones have not increased.