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{Shevchenko:2022:10.1016/j.ocemod.2021.101939,
author = {Shevchenko, I and Berloff, P},
doi = {10.1016/j.ocemod.2021.101939},
journal = {Ocean Modelling},
pages = {101939--101939},
title = {A method for preserving nominally-resolved flow patterns in low-resolution ocean simulations: Dynamical system reconstruction},
url = {http://dx.doi.org/10.1016/j.ocemod.2021.101939},
volume = {170},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Accurate representation of large-scale flow patterns in low-resolution ocean simulations is one of the most challenging problems in ocean modelling. The main difficulty is to correctly reproduce effects of unresolved small scales on the resolved large scales. For this purpose, most of current research is focused on development of parameterizations directly accounting for the small scales. In this work we propose an alternative to the mainstream ideas by showing how to reconstruct a dynamical system from the available reference solution data (our proxy for observations) and, then, how to use this system for modelling not only large-scale but also nominally-resolved flow patterns at low resolutions. This approach is advocated as a part of the novel framework for data-driven hyper-parameterization of mesoscale oceanic eddies in non-eddy-resolving models. The main characteristic of this framework is that it does not require to know the physics behind large–small scale interactions to reproduce both large and small scales in low-resolution ocean simulations. We tested it in the context of a three-layer, statistically equilibrated, steadily forced quasigeostrophic model for the beta-plane configuration and showed that non-eddy-resolving solution can be substantially improved towards the reference eddy-resolving benchmark. The proposed methodology robustly allows to retrieve a system of equations governing reduced dynamics of the observed data, while the additional adaptive nudging counteracts numerical instabilities by keeping solutions in the region of phase space occupied by the reference fields. Remarkably, its solutions simulate not only large-scale but also small-scale flow features, which can be nominally resolved by the low-resolution grid. In addition, the proposed method reproduces realistic vortex trajectories. One of the important and general conclusions that can be drawn from our results is that not only mesoscale eddy parameterization is possible in pri
AU  - Shevchenko,I
AU  - Berloff,P
DO  - 10.1016/j.ocemod.2021.101939
EP  - 101939
PY  - 2022///
SN  - 1463-5003
SP  - 101939
TI  - A method for preserving nominally-resolved flow patterns in low-resolution ocean simulations: Dynamical system reconstruction
T2  - Ocean Modelling
UR  - http://dx.doi.org/10.1016/j.ocemod.2021.101939
UR  - https://www.sciencedirect.com/science/article/pii/S1463500321001840
UR  - http://hdl.handle.net/10044/1/94127
VL  - 170
ER  -
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