Table 2. Climate driver index name and data source.

Climate Variable	Index	Source
ENSO	NINO3.4 SST	http://www.cpc.ncep.noaa.gov/data/indices/
IOD	Dipole Mode Index	https://www.esrl.noaa.gov/psd/gcos_wgsp/Timeseries/DMI/
SAM	Meridional pressure gradient	http://www.nerc-bas.ac.uk/icd/gjma/sam.html