Unusually warm Indian Ocean sea surface temperatures help to arrest development of El Nino in 2014

Dong, Lu; McPhaden, Michael J.

doi:10.1038/S41598-018-20294-4

Unusually warm Indian Ocean sea surface temperatures help to arrest development of El Nino in 2014

Journal Article · Fri Feb 02 00:00:00 EST 2018 · Scientific Reports

DOI:https://doi.org/10.1038/S41598-018-20294-4· OSTI ID:1463348

Dong, Lu ^[1]; McPhaden, Michael J. ^[2]

NOAA/PMEL, Seattle, WA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
NOAA/PMEL, Seattle, WA (United States)

In early 2014, strong westerly wind bursts (WWBs) and high heat content in the equatorial Pacific favored development of a major El Niño. However, significant coupling between the Pacific Ocean and atmosphere failed to take hold during boreal summer of 2014 such that only borderline El Niño conditions were evident by the end of the year. Observational analysis suggests that warm sea surface temperatures (SSTs) in the Indian Ocean in 2014 weakened westerly wind anomalies in the Pacific and may have helped to arrest the development of the El Niño. We test this hypothesis using an ensemble of coupled numerical experiments in which observed Indian Ocean SST anomalies in 2014–15 are prescribed but the Pacific Ocean-atmosphere system is free to evolve. Results confirm that warm SST anomalies in the Indian Ocean created conditions that would have favored a weakening of El Niño by suppressing the Bjerknes feedback in boreal summer of 2014. Furthermore, this process does not preclude others that have been proposed in the unusual evolution of El Niño SSTs in 2014, but it adds to the list a forcing mechanism external to the Pacific basin.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1463348

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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