Abstract
We employ the phase synchronization concept, which is universally adopted to study collective dynamics in many-body systems, to investigate the formation mechanism of coherent structure in a two-dimensional (potential) vorticity conserved system. It is shown that the gradient of mean (potential) vorticity can mediate ``attractive'' coupling among local vortex excitations, so that the vortices get synchronized and a large coherent structure then forms. The phase synchronization concept develops a method for studying self-organization processes in fluid turbulence.
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