FN Archimer Export Format
PT J
TI Interaction between a Quasi-Geostrophic Buoyancy Filament and a Heton
BT 
AF REINAUD, Jean N.
   CARTON, Xavier
   DRITSCHEL, David G.
AS 1:1;2:2;3:1;
FF 1:;2:;3:;
C1 Univ St Andrews, Sch Math & Stat, St Andrews KY16 9AJ, Fife, Scotland.
   UBO UBL, IUEM, Lab Oceanog Phys & Spatiale, F-29280 Plouzane, France.
C2 UNIV ST ANDREWS, UK
   UBO, FRANCE
UM LOPS
TC 5
UR https://archimer.ifremer.fr/doc/00600/71253/69631.pdf
LA English
DT Article
DE ;quasi-geostrophy;surface buoyancy anomaly;vortex dynamics
AB We investigate the interaction between a heton and a current generated by a filament of buoyancy anomaly at the surface. Hetons are baroclinic dipoles consisting of a pair of vortices of opposite signs lying at different depths. Such structures have self-induced motion whenever the pair of vortices are offset horizontally. A surface buoyancy filament generates a shear flow since the density perturbation locally modifies the pressure field. The vertical shear induced by the filament offsets the vortices of the heton if vertically aligned initially. Moreover, if the vortex nearer the surface is in adverse horizontal shear with the buoyancy filament, the heton tends to move towards the filament. Conversely, if the upper vortex is in cooperative horizontal shear with the buoyancy filament, the heton moves away from it. The filament is also naturally unstable and eventually breaks into a series of billows as it is perturbed by the heton. Moderate to large intensity surface buoyancy distributions separate the vortices of the heton, limiting its advection as a baroclinic dipole. Instead, the vortices of the heton start to interact strongly with surface billows. Additionally, the vortices of the heton can be partially destroyed by the filament if the shear it induces is sufficiently large. 
PY 2017
PD SEP
SO Fluids
SN 2311-5521
PU Mdpi
VL 2
IS 3
UT 000417150200003
DI 10.3390/fluids2030037
ID 71253
ER

EF