Subsurface Nonlinear Dynamical Heating and ENSO Asymmetry
Abstract
Abstract This study presents evidence of interannual to interdecadal variabilities residing in the subsurface nonlinear dynamical heating (NDH) along the equatorial Pacific thermocline based on ocean reanalysis products. In association with a flattened thermocline and drastic halt of the Equatorial Undercurrent, the NDH increases sharply right after a peak of the strong El Niño, reducing the linear anomalous advective subsurface cooling by 30%. As the result, subsurface cold signals in the west are significantly weakened as it reaches the easternmost Pacific, causing less surface cooling in the east and thus weakening the subsequent La Niña. Therefore, the subsurface NDH contributes to asymmetry in both the magnitude and structure between El Niño and La Niña. The acute positive subsurface NDH associated with strong El Niño events leads to substantial variations in its decadal means and serves as a potential source for tropical Pacific decadal to interdecadal variabilities.
- Authors:
-
[1];
[1]
- Department of Atmospheric Sciences, SOEST University of Hawai'i at Mānoa Honolulu HI USA
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1413794
- Grant/Contract Number:
- DESC005110
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Name: Geophysical Research Letters Journal Volume: 44 Journal Issue: 24; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Hayashi, Michiya, and Jin, Fei‐Fei. Subsurface Nonlinear Dynamical Heating and ENSO Asymmetry. United States: N. p., 2017.
Web. doi:10.1002/2017GL075771.
Hayashi, Michiya, & Jin, Fei‐Fei. Subsurface Nonlinear Dynamical Heating and ENSO Asymmetry. United States. https://doi.org/10.1002/2017GL075771
Hayashi, Michiya, and Jin, Fei‐Fei. Sun .
"Subsurface Nonlinear Dynamical Heating and ENSO Asymmetry". United States. https://doi.org/10.1002/2017GL075771.
@article{osti_1413794,
title = {Subsurface Nonlinear Dynamical Heating and ENSO Asymmetry},
author = {Hayashi, Michiya and Jin, Fei‐Fei},
abstractNote = {Abstract This study presents evidence of interannual to interdecadal variabilities residing in the subsurface nonlinear dynamical heating (NDH) along the equatorial Pacific thermocline based on ocean reanalysis products. In association with a flattened thermocline and drastic halt of the Equatorial Undercurrent, the NDH increases sharply right after a peak of the strong El Niño, reducing the linear anomalous advective subsurface cooling by 30%. As the result, subsurface cold signals in the west are significantly weakened as it reaches the easternmost Pacific, causing less surface cooling in the east and thus weakening the subsequent La Niña. Therefore, the subsurface NDH contributes to asymmetry in both the magnitude and structure between El Niño and La Niña. The acute positive subsurface NDH associated with strong El Niño events leads to substantial variations in its decadal means and serves as a potential source for tropical Pacific decadal to interdecadal variabilities.},
doi = {10.1002/2017GL075771},
journal = {Geophysical Research Letters},
number = 24,
volume = 44,
place = {United States},
year = {Sun Dec 17 00:00:00 EST 2017},
month = {Sun Dec 17 00:00:00 EST 2017}
}
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