FN Archimer Export Format PT J TI Cyclone-Anticyclone Asymmetry in Geophysical Turbulence BT AF ROULLET, Guillaume KLEIN, Patrice AS 1:1;2:1; FF 1:;2:; C1 IFREMER, Lab Phys Oceans, UMR 6523, CNRS,UBO,IRD, Brest, France. UBO, IFREMER, Lab Phys Oceans, UMR 6523, CNRS,UBO,IRD, Brest, France. C2 UBO, FRANCE CNRS, FRANCE IF 7.622 TC 36 UR https://archimer.ifremer.fr/doc/00005/11587/8240.pdf LA English DT Article AB We address the problem of cyclone-anticyclone asymmetry in geophysical turbulence using a direct numerical simulation with high Reynolds number Re similar to 15 000 that includes an active upper boundary and interior dynamics. The regime, characterized by a finite Rossby number (Ro similar to 0.6) strongly departs from the classical quasigeostrophic regime. The numerical resolution is pushed to the limit of today's supercomputer capabilities ensuring more than two decades free of viscous effects. The results show a strong cyclonic dominance in the upper layers that is stronger for filaments than for vortices. This is in contrast with similar studies that have no active upper boundary which reported either anticyclone dominance or a symmetry between cyclones and anticyclones in the upper layers. This highlights the impact of boundary dynamics on geophysical turbulence. PY 2010 PD MAY SO Physical Review Letters SN 0031-9007 PU American Physical Society VL 104 IS 21 UT 000278150100069 BP 1 EP 4 DI 10.1103/PhysRevLett.104.218501 ID 11587 ER EF