The interaction of two co-rotating quasi-geostrophic vortices in the vicinity of a surface buoyancy filament
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In this paper, we investigate the interaction between two like-signed quasi-geostrophic uniform potential vorticity internal vortices in the vicinity of a surface buoyancy anomaly filament in a three dimensional, stably stratified and rapidly rotating fluid. The surface buoyancy distribution locally modifies the pressure fields and generates a shear flow. We start the study by first considering the effects of a uniform linear horizontal shear on the binary vortex interaction. We confirm that a cooperative shear facilitates the merger of a pair of vortices while an adverse shear has the opposite effect. We next investigate the binary vortex interaction in thevicinity of the surface buoyancy filament explicitly. Here, not only the filament generates a shear flow, but it also responds dynamically to the forcing by the vortex pair. The filament destabilises and forms buoyancy billows at the surface. These billows interact with the internal vortices. In particular, a surface billow may pair with one of the internal vortices. In such cases, the like-signed internal vortex pair may separate if they are initially moderately distant from each other.
Reinaud , J N 2018 , ' The interaction of two co-rotating quasi-geostrophic vortices in the vicinity of a surface buoyancy filament ' Geophysical and Astrophysical Fluid Dynamics , vol. 112 , no. 2 , pp. 130-155 . https://doi.org/10.1080/03091929.2017.1407927
Geophysical and Astrophysical Fluid Dynamics
© 2017, Informa UK Limited. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1080/03091929.2017.1407927
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