статья в журнале

En

OCEAN DYNAMICS

ISSN:1616-7341
eSSN:1616-7228

2022

10.1007/s10236-022-01504-0

This work presents an analysis of the Lorenz energy cycles derived from the simulation results of the Black Sea circulation. Three numerical experiments are carried out based on an eddy-resolving z-model with a horizontal resolution of 1.6 km and taking into account different atmospheric forcing: climatic data, 2011, and 2016. The annual mean circulation for these time intervals reflects the climatic basin-scale, basin-scale (2011) and eddy (2016) regimes. Main differences between experiments are (1) the intensity of atmospheric fluxes and (2) SST assimilation and direct consideration of shortwave radiation in the realistic forcing simulations. The Lorenz energy cycles components are considered in detail. Some common features between climatic and realistic energetics are detected. The annual mean energy conversion from mean motion to the eddy is observed for all circulation regimes. Also, it is obtained that the annual mean buoyancy work enhances the mean current for all experiments, which evidences about maintaining of isopycnal surfaces slope such that a condition for converting available potential energy into kinetic energy is realized. Qualitative difference in the energy transfers for the climatic calculation, basin-scale and eddy regimes is revealed. Conversion from the eddy kinetic energy to eddy available potential energy is observed only for climatic circulation. For the basin-scale circulation the eddy kinetic energy is increasing mainly due to the transfer from the mean current kinetic energy through barotropic instability. The growth of the eddy kinetic energy for the eddy regime is provided by conversion of the available potential energy due to baroclinic instability.

The Black Sea, The Lorenz energy cycle, Mean circulation, Eddy motion, Barotropic and baroclinic instability

2022-04-11 11:09:42