The SOI is defined as the normalized pressure difference between Tahiti and Darwin. There are several slight variations in the SOI values calculated at various centres. Here we supply the SOI (from CRU) which is based on the method given by Ropelewski and Jones (1987).
Time Interval: Monthly
Time Coverage: 1866 to Nov 2006
Update Status: Periodically updated
Data is from CRU via the page http://www.cru.uea.ac.uk/cru/data/soi/.
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Updated: Apr 23, 2013 14:51:03 MDT