Dipole Structure of Mixed Layer Salinity in Response to El Niño-La Niña Asymmetry in the Tropical Pacific

Guan, Cong; Hu, Shijian; McPhaden, Michael J.; Wang, Fan; Gao, Shan; Hou, Yinglin

doi:10.1029/2019GL084817

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Dipole Structure of Mixed Layer Salinity in Response to El Niño-La Niña Asymmetry in the Tropical Pacific

2019
By Guan, Cong ; Hu, Shijian ; McPhaden, Michael J. ; ...
Source: Geophysical Research Letters, 46(21), 12165-12172

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Journal Title:

Geophysical Research Letters
Personal Author:

Guan, Cong ; Hu, Shijian ; McPhaden, Michael J. ; Wang, Fan ; Gao, Shan ; ... More +

Guan, Cong ; Hu, Shijian ; McPhaden, Michael J. ; Wang, Fan ; Gao, Shan ; Hou, Yinglin Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) Less -
Description:

The asymmetry of mixed layer salinity (MLS) anomalies in response to El Niño and La Niña events in the tropical Pacific is examined for the first time based on Argo observations and Estimating the Circulation and Climate of the Ocean simulation. The difference of MLS anomalies between El Niño and La Niña shows a dipole structure, with El Niño featuring strong negative salinity anomalies east of 160°E while La Niña shows remarkable positive salinity anomalies west of 160°E. A salinity budget analysis suggests that nonlinear zonal advection plays a dominant role in generating the asymmetric MLS structure. This dipole MLS structure acts to generate a dipole structure of barrier layer thickness and thus likely plays an important role in the development of El Niño–Southern Oscillation asymmetries in sea surface temperature.
Keywords:

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Barrier Layer El Niño ENSO Asymmetry Nonlinear Salinity Tropical Pacific
Source:

Geophysical Research Letters, 46(21), 12165-12172
DOI:

https://doi.org/10.1029/2019GL084817
Document Type:

Journal Article
Place as Subject:

Pacific Ocean
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CC BY-NC-ND
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Submitted
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urn:sha256:8fe046ea0b0a51dd521ea5842c4439d982542277da2be5b9aa21b0227c4aa049
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https://repository.library.noaa.gov/view/noaa/30626/noaa_30626_DS1.pdf
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Dipole Structure of Mixed Layer Salinity in Response to El Niño-La Niña Asymmetry in the Tropical Pacific

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