Imperial College London
Alternate

ProfessorPavelBerloff

Faculty of Natural Sciences, Department of Mathematics

Professor in Applied Mathematics
 
 
 
//

Contact

 

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

 
 
//

Location

 

745Huxley BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Berloff:2021:10.1017/jfm.2021.477,
author = {Berloff, P and Ryzhov, E and Shevchenko, I},
doi = {10.1017/jfm.2021.477},
journal = {Journal of Fluid Mechanics},
pages = {1--24},
title = {On dynamically unresolved oceanic mesoscale motions},
url = {http://dx.doi.org/10.1017/jfm.2021.477},
volume = {920},
year = {2021}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The problem of defining oceanic mesoscale eddies remains generally unresolved because there is no unique local spatio-temporal filter that can be used for extracting the eddies, and it is unclear what part of the eddy field cannot be actually resolved and needs to be parameterized in a coarse-grid model. We propose using of the coarse-grid model itself for reconstructing dynamically unresolved eddies, which are actually field errors on the top of the dynamically resolved, large-scale reference flow. The novelties and strengths of the approach are that (i) no spatio-temporal filtering is ever needed, (ii) field errors are dynamically translated into the error-correcting forcing and (iii) the latter exactly augments the coarse-grid model solution towards the reference flow. After implementation of the proposed approach, we study statistical properties of the field errors, show their robustness and reveal their significant differences from the locally filtered eddies. We argue that dynamical effects of unresolved eddies can be ultimately parameterized by emulating field errors and closing them on the dynamically resolved flow. So far, our results are limited to the quasigeostrophic approximation, but this serves as a proof of concept and starting point for the follow-up extension into the primitive equations, which are used routinely in the comprehensive oceanic general circulation models.
AU  - Berloff,P
AU  - Ryzhov,E
AU  - Shevchenko,I
DO  - 10.1017/jfm.2021.477
EP  - 24
PY  - 2021///
SN  - 0022-1120
SP  - 1
TI  - On dynamically unresolved oceanic mesoscale motions
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2021.477
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/on-dynamically-unresolved-oceanic-mesoscale-motions/1429DA8FB09B0B74E4EC1A781E3719B5
UR  - http://hdl.handle.net/10044/1/89703
VL  - 920
ER  -
Download