Causes of the El Nino and La Nina Amplitude Asymmetry in the Equatorial Eastern Pacific SCIE SCOPUS

Cited 100 time in WEB OF SCIENCE Cited 101 time in Scopus
Title
Causes of the El Nino and La Nina Amplitude Asymmetry in the Equatorial Eastern Pacific
Author(s)
Su, Jingzhi; Zhang, Renhe; Li, Tim; Rong, Xinyao; Kug, J. -S.; Hong, Chi-Cherng
Publication Year
2010-02
Abstract
The amplitude asymmetry between El Nino and La Nina is investigated by diagnosing the mixed-layer heat budget during the ENSO developing phase by using the three ocean assimilation products: Simple Ocean Data Assimilation (SODA) 2.0.2, SODA 1.4.2, and the Global Ocean Data Assimilation System (GODAS). It is found that the nonlinear zonal and meridional ocean temperature advections are essential to cause the asymmetry in the far eastern Pacific, whereas the vertical nonlinear advection has the opposite effect. The zonal current anomaly is dominated by the geostrophic current in association with the thermocline depth variation. The meridional current anomaly is primarily attributed to the Ekman current driven by wind stress forcing. The resulting induced anomalous horizontal currents lead to warm nonlinear advection during both El Nino and La Nina episodes and thus strengthen (weaken) the El Nino (La Nina) amplitude. The convergence (divergence) of the anomalous geostrophic mixed-layer currents during El Nino (La Nina) results in anomalous downwelling (upwelling) in the far eastern equatorial Pacific, which leads to a cold nonlinear vertical advection in both warm and cold episodes.
ISSN
0894-8755
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4141
DOI
10.1175/2009JCLI2894.1
Bibliographic Citation
JOURNAL OF CLIMATE, v.23, no.3, pp.605 - 617, 2010
Publisher
AMER METEOROLOGICAL SOC
Subject
INDIAN-OCEAN DIPOLE; SEA-SURFACE TEMPERATURE; SOUTHERN-OSCILLATION; DATA ASSIMILATION; PART I; ATMOSPHERE MODELS; CONCEPTUAL-MODEL; CLIMATE FORECAST; WIND STRESS; ENSO
Type
Article
Language
English
Document Type
Article
Publisher
AMER METEOROLOGICAL SOC
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