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{{Short description|Oceanographic phenomenon}}
{{See also|Pacific decadal oscillation}}
[[File:Índice médio anual da Oscilação Interdecadal do Pacifico..jpg|thumb|Annual variation of IPO since 1871 by [[Met Office]]. The positive phases are represented by positive index numbers; negative numbers represent negative phases.]]
The '''
The period of oscillation is roughly 15–30 years. Positive phases of the IPO are characterized by a warmer than average tropical Pacific and cooler than average northern Pacific. Negative phases are characterized by an inversion of this pattern, with cool tropics and warm northern regions.<ref>{{Cite web|url=http://climatology.co.uk/interdecadal-pacific-oscillation#.WuHZ9sjRXIU|title=Climatology - Interdecadal Pacific Oscillation (IPO)|website=climatology.co.uk|access-date=2018-04-26|archive-date=2018-04-18|archive-url=https://web.archive.org/web/20180418042231/http://climatology.co.uk/interdecadal-pacific-oscillation#.WuHZ9sjRXIU|url-status=dead}}</ref>
▲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.<ref>{{cite journal |last1=Salinger |first1=M.J. |last2=Renwick |first2=J.A. |last3=Mullan |title=Interdecadal Pacific Oscillation and South Pacific Climate |journal=[[International Journal of Climatology]] |volume=21 |pages=1705–1721 |year=2001 |doi=10.1002/joc.691 |issue=14 |first3=A.B.|bibcode=2001IJCli..21.1705S|s2cid=129568398 }}</ref>
==References==
{{reflist}}
[[Category:Physical oceanography]]
[[Category:Regional climate effects]]
[[Category:Pacific Ocean]]
[[Category:Climate oscillations]]
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