The best track tropical cyclone data and the SOI data were provided by the Australian Bureau of Meteorology, and quality controlled by Jon Gill. The NOAA Climate Diagnostics Center (http://www.cdc.noaa.gov) provided the NCEP–NCAR reanalysis and OLR data. This research was partly carried out at the Cooperative Research Centre for Southern Hemisphere Meteorology and was supported in part through the Australian Government Cooperative Research Centres Program. The authors thank the three anonymous reviewers, whose comments helped to improve the manuscript.
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