PROPAGATION OF LONG-LIVED ANTICYCLONIC ROSSBY EDDIES OVER AN ISOLATED TOPOGRAPHY AND THEIR MERGING  

作　　者：Luo, De-Hai  Lu, Yan 

机构地区：[1] Ocean Univ. of Qingdao, Qingdao 266003, China

出　　处：《Journal of Hydrodynamics》2001年第3期34-45,共12页水动力学研究与进展B辑（英文版）

摘　　要：In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.

关 键 词：AMPLIFICATION Equations of motion MERGING Surface topography Two dimensional 

分 类 号：P731.26[天文地球—海洋科学]