Imperial College London
Alternate

ProfessorPavelBerloff

Faculty of Natural Sciences, Department of Mathematics

Professor in Applied Mathematics
 
 
 
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Contact

 

+44 (0)20 7594 9662p.berloff Website

 
 
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Location

 

745Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ryzhov:2022:10.1017/jfm.2022.169,
author = {Ryzhov, EA and Berloff, P},
doi = {10.1017/jfm.2022.169},
journal = {Journal of Fluid Mechanics},
title = {On transport tensor of dynamically unresolved oceanic mesoscale eddies},
url = {http://dx.doi.org/10.1017/jfm.2022.169},
volume = {939},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Parameterizing mesoscale eddies in ocean circulation models remains an open problem due to the ambiguity with separating the eddies from large-scale flow, so that their interplay is consistent with the resolving skill of the employed non-eddy-resolving model. One way to address the issue is by using recently formulated dynamically filtered eddies. These eddies are obtained as the field errors of fitting some given reference ocean circulation into the employed coarse-grid ocean model. The main strengths are (i) no explicit spatio-temporal filter is needed for separating the large-scale and eddy flow components, (ii) the eddies are dynamically translated into the error-correcting forcing that perfectly augments the coarse-grid model towards reproducing the reference circulation. We uncovered physical properties of the eddies by interpreting involved nonlinear eddy/large-scale interactions via the classical flux-gradient relation. We described the eddies in terms of their full, space–time dependent transport tensor, which was made unique by constraining it to be the same for the potential vorticity, momentum and buoyancy fluxes. Both diffusive and advective parts of the transport tensor were found to be significant. The diffusive tensor component is characterised by polar eigenvalues and is further decomposed into isotropic and filamentation components. The latter component completely dominates, therefore, it should be taken into account by eddy parameterizations, which is not yet the case. We also showed that spatial inhomogeneities of the transport tensor components are important. Comparing these properties with those obtained for more common, locally filtered eddies revealed that they are distinctly different.
AU  - Ryzhov,EA
AU  - Berloff,P
DO  - 10.1017/jfm.2022.169
PY  - 2022///
SN  - 0022-1120
TI  - On transport tensor of dynamically unresolved oceanic mesoscale eddies
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2022.169
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000772008000001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/on-transport-tensor-of-dynamically-unresolved-oceanic-mesoscale-eddies/F0E08899BA438D5FA0746A9BB8BC12A8#
UR  - http://hdl.handle.net/10044/1/96471
VL  - 939
ER  -
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