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| Ciani, Daniele; Carton, Xavier; Verron, Jacques. |
| Vortex merger is a phenomenon characterizing the whole class of geophysical vortices, from atmospheric storms and large oceanic eddies up to small scale turbulence. Here we focus on the merger of subsurface oceanic anticyclones in an idealized primitive equations model. This study has been motivated by past and recent observations of colliding lens-like anticyclones off of Gibraltar Strait. The critical conditions for merger (critical merger distance and time needed for merger) are determined. We will show that the predictions of classical two-dimensional merger are not verified for subsurface isolated vortices. For instance, critical merger distances will be reduced because of the vortex potential vorticity (PV) structure. The post-merger characteristics... |
| Tipo: Text |
Palavras-chave: Subsurface isolated vortices; Peddies; Meddies; Vortex merger. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00314/42563/44982.pdf |
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| Bashmachnikov, I.; Carton, Xavier; Belonenko, T. V.. |
| In this work, we obtain new results on the manifestation of meddies (or of other deep eddies) at the sea-surface, further developing the results by Bashmachnikov and Carton (2012). The quasi-geostrophic equations are used to describe a near-axisymmetric vortex in the upper ocean, forced at its lower boundary by the isopycnal elevation of a moving meddy. The solution thus obtained provides a better approximation of the characteristics of meddy surface signals. The results show that in subtropics large meddies with dynamic radius R-m >30 km are always seen at the sea-surface with AVISO altimetry, that medium-size meddies with R-m = 20 km may be seen at the sea-surface only if they are sufficiently shallow and strong, while small meddies with R-m =10 km... |
| Tipo: Text |
Palavras-chave: Meddies; Surface signal; Altimetry. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00245/35615/34134.pdf |
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