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contributor authorDong, Lu;McPhaden, Michael J.
date accessioned2018-01-03T11:00:25Z
date available2018-01-03T11:00:25Z
date copyright12/14/2016 12:00:00 AM
date issued2016
identifier otherjcli-d-16-0313.1.pdf
identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4245942
description abstractAbstractBoth the Indian and Pacific Oceans exhibit prominent decadal time scale variations in sea surface temperature (SST), linked dynamically via atmospheric and oceanic processes. However, the relationship between SST in these two basins underwent a dramatic transformation beginning around 1985. Prior to that, SST variations associated with the Indian Ocean basin mode (IOB) and the interdecadal Pacific oscillation (IPO) were positively correlated, whereas afterward they were much less clearly synchronized. Evidence is presented from both observations and coupled state-of-the-art climate models that enhanced external forcing, particularly from increased anthropogenic greenhouse gases, was the principal cause of this changed relationship. Using coupled climate model experiments, it is shown that without external forcing, the evolution of the IOB would be strongly forced by variations in the IPO. However, with strong external forcing, the dynamical linkage between the IOB and the IPO weakens so that the negative phase IPO after 2000 is unable to force a negative phase IOB-induced cooling of the Indian Ocean. This changed relationship in the IOB and IPO led to unique SST patterns in the Indo-Pacific region after 2000, which favored exceptionally strong easterly trade winds over the tropical Pacific Ocean and a pronounced global warming hiatus in the first decade of the twenty-first century.
publisherAmerican Meteorological Society
titleWhy Has the Relationship between Indian and Pacific Ocean Decadal Variability Changed in Recent Decades?
typeJournal Paper
journal volume30
journal issue6
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-16-0313.1
journal fristpage1971
journal lastpage1983
treeJournal of Climate:;2016:;volume( 030 ):;issue: 006
contenttypeFulltext


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