Asymmetric modulation of El Nino and La Nina and the linkage to tropical Pacific decadal variability

Okumura, Yuko M.; Sun, Tianyi; Wu, Xian

doi:10.1175/JCLI-D-16-0680.1

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Asymmetric modulation of El Nino and La Nina and the linkage to tropical Pacific decadal variability

2017
By Okumura, Yuko M. ; Sun, Tianyi ; Wu, Xian
Source: Journal of Climate, 30(12), 4705-4733.

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Journal Title:

Journal of Climate
Personal Author:

Okumura, Yuko M. ; Sun, Tianyi ; Wu, Xian

Okumura, Yuko M. ; Sun, Tianyi ; Wu, Xian Less -
Corporate Authors:

United States. National Oceanic and Atmospheric Administration. Office of Oceanic and Atmospheric Research ; Modeling, Analysis, Predictions, and Projections Program (U.S.)

United States. National Oceanic and Atmospheric Administration. Office of Oceanic and Atmospheric Research ; Modeling, Analysis, Predictions, and Projections Program (U.S.) Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

El Niño–Southern Oscillation (ENSO) in a 1300-yr preindustrial control simulation of the Community Climate System Model, version 4 (CCSM4), exhibits distinct modulation in association with tropical Pacific decadal variability (TPDV). The frequency and duration of El Niño events modulate with changes in the interbasin sea surface temperature (SST) gradient related to the leading mode of TPDV, which resembles the interdecadal Pacific oscillation (IPO). La Niña shows similar changes with the IPO but is also controlled by changes in El Niño that often precedes La Niña, and these effects tend to cancel each other. The amplitude of ENSO, on the other hand, is closely related to the second leading mode of TPDV that affects the zonal and meridional contrast of tropical Pacific climate. Significant changes in the pattern and seasonal evolution related to this TPDV mode are found mainly for El Niño because of the nonlinear relation between the atmospheric deep convection and SSTs. The resultant changes in the amplitude of El Niño, in turn, affect the amplitude and duration of the following La Niña, as well as the asymmetry in their patterns and duration. The decadal ENSO modulation associated with both TPDV modes is not symmetrical between El Niño and La Niña and thus is not likely to occur solely as a result of random variability. The patterns of TPDV in CCSM4 have resemblance to those simulated by its atmospheric component coupled to a slab ocean model, suggesting that TPDV induced by stochastic atmospheric variability interacts with the ENSO dynamics.
Keywords:

[+]

Climatology El Niño Current Models Ocean-atmosphere Interaction Oscillations Southern Oscillation Tropics Climate Models ENSO Pacific Decadal
Source:

Journal of Climate, 30(12), 4705-4733.
DOI:

https://doi.org/10.1175/JCLI-D-16-0680.1
Document Type:

Journal Article
Funding:

Grant no. NA14OAR4310227
Place as Subject:

Pacific Ocean
Rights Information:

Other
Compliance:

Submitted
Main Document Checksum:

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urn:sha256:f94c98a364c7e8412af7b444ceabf6f1ef677b920bae3e091a7324b180912915
Download URL:

https://staging-noaa.cdc.gov/view/noaa/28403/noaa_28403_DS1.pdf
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Asymmetric modulation of El Nino and La Nina and the linkage to tropical Pacific decadal variability

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