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. We hypothesized that the overwhelming dominance of cyclonic spirals on satellite images of the sea surface could be caused by some differences between the rotary characteristics of submesoscale cyclonic andanticyclonic eddies. This hypothesis was tested by means of numericalexperiments with synthetic floating Lagrangian particles embedded offline ina regional circulation model of the southeastern Baltic Sea with very highhorizontal resolution (0.125 nautical mile grid). The numerical experimentsshowed that the cyclonic spirals can be formed from both a horizontally uniform initial distribution of floating particles and from the initiallylined-up particles during an advection time of the order of 1 d. Statistical processing of the trajectories of the synthetic floatingparticles allowed us to conclude that the submesoscale cyclonic eddies differfrom the anticyclonic eddies in three ways favoring the formation ofspirals in the tracer field: they can be characterized by (a) a considerably higher angular velocity, (b) a more pronounced differential rotation and (c) a negative helicity.

Rotation of floating particles in submesoscale cyclonic and anticyclonic eddies: a model study for the southeastern Baltic Sea