Storm Cyclogenesis over the Sea of Japan on January 16–18, 2016: Analysis of Energy and Interaction of Vortices

The paper presents the results of studying the conversion of various types of energy, taking into account the formation and dissipation of a warm core in the central part of cyclones. The contribution of energy types (kinetic, potential, and internal) and their impact on the intensity of the cyclone development were also assessed by the example of the evolution of a mesocyclone. The mesocyclone was generated on the periphery of the main subtropical cyclone in January 2016 over the Sea of Japan and caused heavy precipitation and strong winds on the southern coast of the Primorsky krai. It is shown for each of the two analyzed cyclones that the stage of their deepening is accompanied by the formation of the warm core with a simultaneous decrease in the bulk values of all potential energy indicators for the vortex in the central region. At the stage of dissipation of the warm core, the values of all potential energy indicators increase. A change in water vapor reserves in the central part of both cyclones is similar to a change in internal energy, which is associated with the transformation of water vapor in the atmosphere (forced and free convection).