Origin of early-spring central Pacific warming as the 1982–1983 El Niño precursor

Ji Won Kim, Soon-Il An

Research output: Contribution to journalArticle

Abstract

The extreme El Niño events, such as those which occurred in 1982–1983, 1997–1998, and 2015–2016, exerted devastating impacts in many parts of the globe. Hence, it is crucial to understand the precursors of such extreme events. Nevertheless, each El Niño event has its own characteristics even in the initiation. Here, we show that the development of early-spring equatorial central Pacific warming forced by the increased solar radiation due to a suppressed convection was a crucial factor in developing the 1982–1983 extreme El Niño event. The central Pacific warming anomalies in the spring of 1982 were induced by atmospheric subsidence connected to the northern subtropical Pacific convection, subsequently reinforced by a reduced evaporative cooling via westerly anomalies. On the other hand, springtime warming anomalies over the equatorial central and eastern Pacific regions during other extreme El Niño events were induced mainly by oceanic dynamical processes.

Original languageEnglish
Pages (from-to)2899-2906
Number of pages8
JournalInternational Journal of Climatology
Volume38
Issue number6
DOIs
Publication statusPublished - 2018 May 1

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warming
anomaly
convection
extreme event
westerly
solar radiation
subsidence
cooling

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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abstract = "The extreme El Ni{\~n}o events, such as those which occurred in 1982–1983, 1997–1998, and 2015–2016, exerted devastating impacts in many parts of the globe. Hence, it is crucial to understand the precursors of such extreme events. Nevertheless, each El Ni{\~n}o event has its own characteristics even in the initiation. Here, we show that the development of early-spring equatorial central Pacific warming forced by the increased solar radiation due to a suppressed convection was a crucial factor in developing the 1982–1983 extreme El Ni{\~n}o event. The central Pacific warming anomalies in the spring of 1982 were induced by atmospheric subsidence connected to the northern subtropical Pacific convection, subsequently reinforced by a reduced evaporative cooling via westerly anomalies. On the other hand, springtime warming anomalies over the equatorial central and eastern Pacific regions during other extreme El Ni{\~n}o events were induced mainly by oceanic dynamical processes.",
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Origin of early-spring central Pacific warming as the 1982–1983 El Niño precursor. / Kim, Ji Won; An, Soon-Il.

In: International Journal of Climatology, Vol. 38, No. 6, 01.05.2018, p. 2899-2906.

Research output: Contribution to journalArticle

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