The interdecadal Pacific oscillation (IPO) is an oceanographic/meteorological phenomenon similar to the Pacific decadal oscillation (PDO) but for a wider area of the Pacific. Significantly it covers the Southern hemisphere as well as the Northern hemisphere (50°S to 50°N).
The IPO had positive phases (southeastern tropical Pacific warm) from 1922 to 1946 and 1978 to 1998, and a negative phase between 1947 and 1976. Salinger, M.J.; Renwick, J.A.; Mullan, A.B. (2001). "Interdecadal Pacific Oscillation and South Pacific Climate". International Journal of Climatology. 21 (14): 1705–1721. doi:10.1002/joc.691.</ref>
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