ENSO regimes: Reinterpreting the canonical and Modoki El Nino

K. Takahashi 1 A. Montecinos 2 K. Goubanova 3, 1 B. Dewitte 1, 3
3 ECOLA LEGOS
LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
Abstract : We propose that the first two empirical orthogonal function (EOF) modes of tropical Pacific sea surface temperature (SST) anomalies do not describe different phenomena (i.e., El Nino-Southern Oscillation (ENSO) and "El Nino Modoki") but rather the nonlinear evolution of ENSO. We introduce two new uncorrelated indices (E and C), based on the leading EOFs, that respectively account for extreme warm events in the eastern and cold/moderate warm events in the central equatorial Pacific, corresponding to regimes with different evolution. Recent trends in ENSO can be described as an increase in the central Pacific (C) variability that is associated with stronger cold events, as well as a reduction in the eastern Pacific (E) variability within the cold/moderate warm regime, consistent with model projections. However, little can be said observationally with respect to the extreme warm regime. Citation: Takahashi, K., A. Montecinos, K. Goubanova, and B. Dewitte (2011), ENSO regimes: Reinterpreting the canonical and Modoki El Nino, Geophys. Res. Lett., 38, L10704, doi:10.1029/2011GL047364.
Document type :
Journal articles
Complete list of metadatas

Cited literature [34 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-00994266
Contributor : Nadia Ayoub <>
Submitted on : Thursday, May 22, 2014 - 12:03:50 PM
Last modification on : Tuesday, October 29, 2019 - 1:29:56 AM
Long-term archiving on : Friday, August 22, 2014 - 11:16:36 AM

File

grl28063.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

K. Takahashi, A. Montecinos, K. Goubanova, B. Dewitte. ENSO regimes: Reinterpreting the canonical and Modoki El Nino. Geophysical Research Letters, American Geophysical Union, 2011, 38, pp.5. ⟨10.1029/2011gl047364⟩. ⟨hal-00994266⟩

Share

Metrics

Record views

490

Files downloads

928