Simulation of Deep Cycle Turbulence by a Global Ocean General Circulation Model

Pei, Suyang; Shinoda, Toshiaki; Wang, Wanqiu; Lien, Ren‐Chieh

doi:10.1029/2020GL088384

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Simulation of Deep Cycle Turbulence by a Global Ocean General Circulation Model

2020
By Pei, Suyang ; Shinoda, Toshiaki ; Wang, Wanqiu ; ...
Source: Geophysical Research Letters, 47, e2020GL088384

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Journal Title:

Geophysical Research Letters
Personal Author:

Pei, Suyang ; Shinoda, Toshiaki ; Wang, Wanqiu ; Lien, Ren‐Chieh

Pei, Suyang ; Shinoda, Toshiaki ; Wang, Wanqiu ; Lien, Ren‐Chieh Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) ; NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction) Less -
Description:

Deep cycle turbulence (DCT) is a diurnally oscillating turbulence that penetrates into a stratified shear layer below the surface mixed layer, which is often observed in the eastern Pacific and Atlantic above the Equatorial Undercurrent (EUC). Here we present the simulation of DCT by a global ocean general circulation model (OGCM) for the first time. As the k-ε vertical mixing scheme is used in the OGCM, the simulation of observed DCT structure based on in situ microstructure measurements can be explicitly demonstrated. The simulated DCT is found in all equatorial ocean basins, and its characteristics agree very well with observations. Zonal and meridional variations of DCT in the entire equatorial Pacific and Atlantic are described through constructing the composite diurnal cycle. In the central Pacific where the maximum shear associated with EUC is deep, the separation of DCT from the surface mixed layer is much more prominent than other areas.
Keywords:

[+]

Diurnal Cycle Turbulence Equitorial Undercurrent Marginal Instability Ocean General Circulation Model Tropical Instability Waves
Source:

Geophysical Research Letters, 47, e2020GL088384
DOI:

https://doi.org/10.1029/2020GL088384
Document Type:

Journal Article
Funding:

Grant no. NA15OAR431074 ; Grant no. NA17OAR4310256

Grant no. NA15OAR431074 ; Grant no. NA17OAR4310256 Less -
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urn:sha256:b86dfdb1d1b821a6c41f54af1196624e3d0c69861b6b806721ca32e3636e06cb
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Simulation of Deep Cycle Turbulence by a Global Ocean General Circulation Model

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