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STATISTICAL CHARACTERISTICS OF MESOSCALE EDDIES NEAR THE KUROSHIO EXTENSION REGION

HU Dong;CHEN Xi;MAO Ke-Feng;TENG Jun;LI Yan;PENG Xu-Dong;The 31010 Army of PLA;College of Meteorology and Oceanography, National University of Defense Technology;  
We analyzed statistical characteristics and seasonal variations of mesoscale eddies in the Kuroshio Extension Region(25°—45°N, 135°E—175°W) based on satellite altimetry data. With the automatic identification method, 3006 cyclonic eddy(CE) trajectories and 2887 anticyclonic eddy(AE) trajectories have been recognized. The mean lifetimes of CE and AE are 9.99 weeks and 11 weeks, and the mean radiuses are 69.5 km and 71.8 km, respectively. The radius, eddy kinetic energy(EKE), energy intensity(EI), and vorticity of most of the long-lived eddies evolve from increase, linger, to decrease in their lifespans. Most eddies propagate westward while their meridional movement is not significant. Both CE and AE have southward(equatorward) deflection. The amount of newly generated eddies and the total quantity of eddies are larger in spring and summer, during what time, mean vorticity, EKE and EI of CEs are at high levels.
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