Frontogenesis and Frontolysis of a Cold Filament Driven by the Cross-Filament Wind and Wave Fields Simulated by a Large Eddy Simulation

The variations of the frontogenetic trend of a cold filament induced by the cross-filament wind and wave fields are studied by a non-hydrostatic large eddy simulation. Five cases with different strengths of wind and wave fields are studied. The results show that the intense wind and wave fields furt...

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Bibliographic Details
Published in:Advances in atmospheric sciences 2024-03, Vol.41 (3), p.509-528
Main Authors: Li, Guojing, Wang, Dongxiao, Dong, Changming, Pan, Jiayi, Shu, Yeqiang, Zhang, Zhenqiu
Format: Article
Language:English
Subjects:
Atmospheric Sciences
Convergence and divergence
Downwelling
Earth and Environmental Science
Earth Sciences
Frontogenesis
Frontolysis
Geophysics/Geodesy
Inertial oscillations
Large eddy simulation
Large eddy simulations
Meteorology
Ocean circulation
Original Paper
Upwelling
Vortices
Wind
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Summary:The variations of the frontogenetic trend of a cold filament induced by the cross-filament wind and wave fields are studied by a non-hydrostatic large eddy simulation. Five cases with different strengths of wind and wave fields are studied. The results show that the intense wind and wave fields further break the symmetries of submesoscale flow fields and suppress the levels of filament frontogenesis. The changes of secondary circulation directions—that is, the conversion between the convergence and divergence of the surface cross-filament currents with the downwelling and upwelling jets in the filament center—are associated with the inertial oscillation. The filament frontogenesis and frontolysis caused by the changes of secondary circulation directions may periodically sharpen and smooth the gradient of submesoscale flow fields. The lifecycle of the cold filament may include multiple stages of filament frontogenesis and frontolysis.
ISSN:0256-1530
1861-9533
DOI:10.1007/s00376-023-3037-2