Home > La Niña forces unprecedented Leeuwin Current warming in 2011

La Niña forces unprecedented Leeuwin Current warming in 2011

Posted on 13 March 2013

TitleLa Niña forces unprecedented Leeuwin Current warming in 2011
Publication TypeJournal Article
Year of Publication2013
AuthorsFeng, M, McPhaden MJ, Xie S-P, Hafner J
JournalScientific Reports
Date Published2/2013
KeywordsAtmospheric dynamics, Climate-change impacts, Physical oceanography
AbstractUnprecedented warm sea surface temperature (SST) anomalies were observed off the west coast of Australia in February–March 2011. Peak SST during a 2-week period were 5°C warmer than normal, causing widespread coral bleaching and fish kills. Understanding the climatic drivers of this extreme event, which we dub “Ningaloo Niño”, is crucial for predicting similar events under the influence of global warming. Here we use observational data and numerical models to demonstrate that the extreme warming was mostly driven by an unseasonable surge of the poleward-flowing Leeuwin Current in austral summer, which transported anomalously warm water southward along the coast. The unusual intensification of the Leeuwin Current was forced remotely by oceanic and atmospheric teleconnections associated with the extraordinary 2010–2011 La Niña. The amplitude of the warming was boosted by both multi-decadal trends in the Pacific toward more La Niña-like conditions and intraseasonal variations in the Indian Ocean.
Short TitleSci. Rep.