ON THE BEHAVIORS OF OCEAN BOTTOM EDDY

On the basis of scaling analysis,this paper presents a frontal geostrophic dynamic system which canbe used to describe the dynamics of an isolated bottom eddy and shows that five possible dynamicsubregimes are included in the system.A particle-in-cell method is used to investigate the behavior of the eddy in the two dynamic subregimes,with 1)nonlinear effect(ε)relevant to the sloping bottom-inducedbeta effect(β_1)and 2)seamount-induced beta effect(β_2)dominant.In the dynamic subregime of β_1～ ε～10~(-2)and β_2=0,the eddy can keep as a whole for a long time and migrates for a long distance.Inthe dynamic subregime where the seamount-induced beta effect (β_2～10~(-1))is dominant,the seamounttraps the water particles,causing the eddy to break up into a discrete set of eddies moving around the seamount.

On the behaviors of ocean bottom eddy

On the basis of scaling analysis, this paper presents a frontal geostrophic dynamic system which can be used to describe the dynamics of an isolated bottom eddy and shows that five possible dynamic subregimes are included in the system. A particle-in-cell method is used to investigate the behavior of the eddy in the two dynamic subregimes, with 1) nonlinear effect (ε) relevant to the sloping bottom-induced beta effect (β ₁) and 2) seamount-induced beta effect (β ₂) dominant. In the dynamic subregime ofβ ₁∼ε∼10^-2 andβ ₂=0, the eddy can keep as a whole for a long time and migrates for a long distance. In the dynamic subregime where the seamount-induced beta effect (β ₁∼10^-1) is dominant, the seamount traps the water particles, causing the eddy to break up into a discrete set of eddies moving around the seamount. This research was supported by NNSF (No. 49276267) and the State Education Commission of China.