Assuming eddy kinetic energy is equally partitioned between the barotropic mode and the first baroclinic mode and using the weekly TOPEX/ERS merged data for the period of 1993~2007, the mean eddy kinetic energy and eddy available gravitational potential energy in the world oceans are estimated at 0.157 and 0.224 EJ; the annual mean generation/dissipation rate of eddy kinetic energy and available gravitational potential energy in the world oceans is estimated at 0.203 TW. Scaling and data analysis indicate that eddy available gravitational potential energy and its generation/dissipation rate are larger than those of eddy kinetic energy.
High rate of eddy energy generation/dissipation is primarily concentrated in eddy-rich regions, such as the Antarctic Circumpolar Current and the western boundary current extensions. Outside of these regimes of intense current, the energy generation/dissipation rate is two to four orders of magnitude lower than the peak values; however, along the eastern boundaries and in the region where complicated topography and current interact the eddy energy generation/dissipation rate is several times larger than those in background.
Mesoscale eddies Altimetry data Generation/dissipation rate Two-layer model
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This study used altimeter data available by the AVISO Altimetry Operations Center, plus hydrographic data World Ocean Atlas 2001 provided by the US National Oceanographic Data Center. Reviewers' critical comments helped us improving the presentation of this paper. This study is supported by grants KZCX1-YW-12-02, 40976010, 40776008, and U1033002.
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