Role of Mixed‐Layer Instabilities in the Seasonal Evolution of Eddy Kinetic Energy Spectra in a Global Submesoscale Permitting Simulation

Khatri, Hemant; Griffies, Stephen M.; Uchida, Takaya; Wang, Han; Menemenlis, Dimitris

doi:10.1029/2021GL094777

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The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.

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Role of Mixed‐Layer Instabilities in the Seasonal Evolution of Eddy Kinetic Energy Spectra in a Global Submesoscale Permitting Simulation

2021
By Khatri, Hemant ; Griffies, Stephen M. ; Uchida, Takaya ; ...
Source: Geophysical Research Letters, 48(18), e2021GL094777

[PDF-2.54 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Khatri, Hemant ; Griffies, Stephen M. ; Uchida, Takaya ; Wang, Han ; Menemenlis, Dimitris

Khatri, Hemant ; Griffies, Stephen M. ; Uchida, Takaya ; Wang, Han ; Menemenlis, Dimitris Less -
NOAA Program & Office:

CIMES (Cooperative Institute for Modeling the Earth System) ; OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)

CIMES (Cooperative Institute for Modeling the Earth System) ; OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:

A submesoscale-permitting global ocean simulation is used to study the upper ocean turbulence in high kinetic energy (KE) regions. Submesoscale processes peak in winter so that the geostrophic KE spectra tend to be relatively shallow in winter (urn:x-wiley:00948276:media:grl63015:grl63015-math-0001) with steeper spectra in summer (urn:x-wiley:00948276:media:grl63015:grl63015-math-0002). This transition in KE spectral scaling has two phases. In the first phase (late autumn), KE spectra show the presence of two spectral regimes: urn:x-wiley:00948276:media:grl63015:grl63015-math-0003 power-law in mesoscales and urn:x-wiley:00948276:media:grl63015:grl63015-math-0004 power-law in submesoscales. The first phase appears with the onset of mixed-layer instabilities, which convert available potential energy into KE, and this process results in a flattening of KE spectra at submesoscales. However, KE spectra at longer wavelengths follow urn:x-wiley:00948276:media:grl63015:grl63015-math-0005 scaling associated with a forward enstrophy transfer. In the second phase (late winter), KE produced through mixed-layer instabilities is transferred to larger scales, and urn:x-wiley:00948276:media:grl63015:grl63015-math-0006 power-law also develops in mesoscales.
Keywords:

[+]

Kinetic energy Kinetic Energy Spectrum Seasonality Upper Ocean Turbulence
Source:

Geophysical Research Letters, 48(18), e2021GL094777
DOI:

https://doi.org/10.1029/2021GL094777
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4320123
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Submitted
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urn:sha256:463cebe56dca1045265717f19603f1a2d533b474fcc5563e856250d7ebd7c82e
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https://repository.library.noaa.gov/view/noaa/43143/noaa_43143_DS1.pdf
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Role of Mixed‐Layer Instabilities in the Seasonal Evolution of Eddy Kinetic Energy Spectra in a Global Submesoscale Permitting Simulation

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