Surface quasi-geostrophic model and application to vortex merger : results and data

Date 2022-05-05
Temporal extent 2022-05-05 -2042
Author(s) Oulhen Erwan1, Reinaud JeanORCID2, Carton XavierORCID3
Affiliation(s) 1 : LOPS/IUEM/UBO, Brest
2 : Mathematics Department, University of St Andrews
3 : LOPS/IUEM/UBO, Brest
DOI 10.17882/87995
Publisher SEANOE
Keyword(s) Surface quasi-geostrophy, small vortices, core trapping, barotropic instability, vortex merger

The merger of two surface quasi-geostrophic vortices is examined in detail. As the two vortices collapse towards each other in the merging process, they trap their external fronts between them; these fronts are inserted into the final merged vortex, where they form a central, nearly parallel, sheared velocity strip, sen- sitive to barotropic instability. As a result, this strip breaks up into an alley of small vortices. Subsequently, these small vortices may undergo merger and grow in size in the core of the large merged vortex. The number of small trapped vortices decreases correspondingly. Finally, a single or two small vortices remain. These processes are analysed using a numerical model of the surface quasi-geostrophic equations. The sensitivity of this process to the initial vortex characteristics is explored. A parallel is drawn between this problem and the instability of a rectilinear strip of temperature with a central gap. The application of this problem to the Ocean is discussed.

Licence CC-BY
Acknowledgements UBO and IUEM for support during this study/ University of St Andrews for support / EUR IS Blue grant for master's degree internship
Sensor metadata

none / numerical modeling

File Size Format Processing Access
Geophysical & Astrophysical Fluid Dynamics (GGAF) Article ID: GGAF 2074983 - model results 1 GB tar.gz Open access
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How to cite 

Oulhen Erwan, Reinaud Jean, Carton Xavier (2022). Surface quasi-geostrophic model and application to vortex merger : results and data. SEANOE.

In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :

Erwan Oulhen, Jean Reinaud, Xavier Carton (2022). Formation of small-scale vortices in the core of a large merged vortex . Accepted in Geophysical & Astrophysical Fluid Dynamics (GGAF)