Intrinsic dynamics and long-term evolution of a convectively generated oceanic vortex in the Greenland Sea

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摘要：

Nonstationary dynamics, realistic long-term evolution, and influence on local convection characterizing an oceanic vortex similar to those observed in the central Greenland Sea were investigated using in situ data, a hierarchy of numerical models, and an analytical theory. A non-hydrostatic model for the simulation of convective plumes was nested into a regional ocean-ice model forced and initialized by a global, atmosphere/ocean/ice model. In the central Greenland Sea, water masses similar to those observed in a convectively-generated vortex and a corresponding numerically reconstructed 3D velocity were imposed in the non-hydrostatic model. Under atmospheric/oceanic realistic conditions and forcing, the simulated vortex evolved as an almost circular, nonstationary, long-lived, predominantly anticyclonically rotating feature. As time elapsed, it detached from the sea surface and became an intermediate vortex, which influenced the local convective preconditioning. Its inertial pulsations, shape, and velocity structure closely resemble corresponding characteristics of recently discovered theoretic nonstationary anticyclones.

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Theoretical or Mathematical/ atmospheric movements convection numerical analysis oceanographic regions/ convectively generated oceanic vortex Greenland Sea nonstationary dynamics in situ data numerical models analytical theory nonhydrostatic model convective plumes regional ocean-ice model global atmosphere/ocean/ice model reconstructed 3D velocity anticyclones/ A9210F Dynamics of the upper ocean A9210L Turbulence, diffusion, mixing, and convection in the oceans A9210K Sea-air interactions A9260B General atmospheric circulation A9330R Regional seas A0260 Numerical approximation and analysis