Feedback process responsible for intermodel diversity of ENSO variability

Soon Il An, Eun Sook Heo, Seon Tae Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The origin of the intermodel diversity of the El Niño–Southern Oscillation (ENSO) variability is investigated by applying a singular value decomposition (SVD) analysis between the intermodel tropical Pacific sea surface temperature anomalies (SSTA) variance and the intermodel ENSO stability index (BJ index). The first SVD mode features an ENSO-like pattern for the intermodel SSTA variance (74% of total variance) and the dominant thermocline feedback (TH) for the BJ index (51%). Intermodel TH is mainly modified by the intermodel sensitivity of the zonal thermocline gradient response to zonal winds over the equatorial Pacific (β h ), and the intermodel β h is correlated higher with the intermodel off-equatorial wind stress curl anomalies than the equatorial zonal wind stress anomalies. Finally, the intermodel off-equatorial wind stress curl is associated with the meridional shape and intensity of ENSO-related wind patterns, which may cause a model-to-model difference in ENSO variability by influencing the off-equatorial oceanic Rossby wave response.

Original languageEnglish
Pages (from-to)4272-4279
Number of pages8
JournalGeophysical Research Letters
Volume44
Issue number9
DOIs
Publication statusPublished - 2017 May 16

Fingerprint

oscillation
oscillations
wind stress
anomalies
thermoclines
sea surface temperature
zonal wind
thermocline
temperature anomaly
anomaly
decomposition
decomposition analysis
Rossby wave
planetary waves
gradients
causes
sensitivity
index

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

An, Soon Il ; Heo, Eun Sook ; Kim, Seon Tae. / Feedback process responsible for intermodel diversity of ENSO variability. In: Geophysical Research Letters. 2017 ; Vol. 44, No. 9. pp. 4272-4279.
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Feedback process responsible for intermodel diversity of ENSO variability. / An, Soon Il; Heo, Eun Sook; Kim, Seon Tae.

In: Geophysical Research Letters, Vol. 44, No. 9, 16.05.2017, p. 4272-4279.

Research output: Contribution to journalArticle

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AB - The origin of the intermodel diversity of the El Niño–Southern Oscillation (ENSO) variability is investigated by applying a singular value decomposition (SVD) analysis between the intermodel tropical Pacific sea surface temperature anomalies (SSTA) variance and the intermodel ENSO stability index (BJ index). The first SVD mode features an ENSO-like pattern for the intermodel SSTA variance (74% of total variance) and the dominant thermocline feedback (TH) for the BJ index (51%). Intermodel TH is mainly modified by the intermodel sensitivity of the zonal thermocline gradient response to zonal winds over the equatorial Pacific (β h ), and the intermodel β h is correlated higher with the intermodel off-equatorial wind stress curl anomalies than the equatorial zonal wind stress anomalies. Finally, the intermodel off-equatorial wind stress curl is associated with the meridional shape and intensity of ENSO-related wind patterns, which may cause a model-to-model difference in ENSO variability by influencing the off-equatorial oceanic Rossby wave response.

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