Two types of El Niño events: Cold tongue El Niño and warm pool El Niño

Jong Seong Kug, Fei Fei Jin, Soon Il An

Research output: Contribution to journalArticle

732 Citations (Scopus)

Abstract

In this study, two types of El Niño events are classified based on spatial patterns of the sea surface temperature (SST) anomaly. One is the cold tongue (CT) El Niño, which can be regarded as the conventional El Niño, and the other the warm pool (WP) El Niño. The CT El Niño is characterized by relatively large SST anomalies in the Niño-3 region (58S-58N, 1508-908W), while the WP El Niño is associated with SST anomalies mostly confined to the Niño-4 region (58S-58N, 1608E-1508W). In addition, spatial patterns of many atmospheric and oceanic variables are also distinctively different for the two types of El Niño events. Furthermore, the difference in the transition mechanism between the two types of El Niño is clearly identified. That is, the discharge process of the equatorial heat content associated with the WP El Niño is not efficient owing to the spatial structure of SST anomaly; as a result, it cannot trigger a cold event. It is also demonstrated that zonal advective feedback (i.e., zonal advection of mean SST by anomalous zonal currents) plays a crucial role in the development of a decaying SST anomaly associated with theWP El Niño, while thermocline feedback is a key process during the CT El Niño.

Original languageEnglish
Pages (from-to)1499-1515
Number of pages17
JournalJournal of Climate
Volume22
Issue number6
DOIs
Publication statusPublished - 2009 Apr 14

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warm pool
temperature anomaly
sea surface temperature
thermocline
cold
advection

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Kug, Jong Seong ; Jin, Fei Fei ; An, Soon Il. / Two types of El Niño events : Cold tongue El Niño and warm pool El Niño. In: Journal of Climate. 2009 ; Vol. 22, No. 6. pp. 1499-1515.
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abstract = "In this study, two types of El Ni{\~n}o events are classified based on spatial patterns of the sea surface temperature (SST) anomaly. One is the cold tongue (CT) El Ni{\~n}o, which can be regarded as the conventional El Ni{\~n}o, and the other the warm pool (WP) El Ni{\~n}o. The CT El Ni{\~n}o is characterized by relatively large SST anomalies in the Ni{\~n}o-3 region (58S-58N, 1508-908W), while the WP El Ni{\~n}o is associated with SST anomalies mostly confined to the Ni{\~n}o-4 region (58S-58N, 1608E-1508W). In addition, spatial patterns of many atmospheric and oceanic variables are also distinctively different for the two types of El Ni{\~n}o events. Furthermore, the difference in the transition mechanism between the two types of El Ni{\~n}o is clearly identified. That is, the discharge process of the equatorial heat content associated with the WP El Ni{\~n}o is not efficient owing to the spatial structure of SST anomaly; as a result, it cannot trigger a cold event. It is also demonstrated that zonal advective feedback (i.e., zonal advection of mean SST by anomalous zonal currents) plays a crucial role in the development of a decaying SST anomaly associated with theWP El Ni{\~n}o, while thermocline feedback is a key process during the CT El Ni{\~n}o.",
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Two types of El Niño events : Cold tongue El Niño and warm pool El Niño. / Kug, Jong Seong; Jin, Fei Fei; An, Soon Il.

In: Journal of Climate, Vol. 22, No. 6, 14.04.2009, p. 1499-1515.

Research output: Contribution to journalArticle

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