Abstract:In this study,the MCS process under the background of Northeast Cold Vortex is simulated using the WRF model.A Barnes filter is used to decompose the model data into three scales,which are then substituted into the corresponding energy equation for calculation.Next,the development process of MCS,energy conversion of multi-scale system,and relationship between kinetic energy and precipitation are studied from the perspective of energy.The research results show that in this process a large amount of potential energy is transferred to kinetic energy,which provides energy for the development of the system.During the development of convection cell to MCS forming,the large scale kinetic energy in the middle and lower layers decreased,while the large-scale kinetic energy changed the small-and medium-scale kinetic energy,which in turn promoted the development of the convective monomer.The enhancement of large-scale kinetic energy in the upper layer corresponds to that of the upper jet stream,and promotes the development of the convection system.The β mesoscale system performs kinetic energy transfer to the α mesoscale system in the middle layer,which promotes the formation of the MCS.During the formation and development of the MCS,the conversion of potential energy at various scales to kinetic energy at the α and β mesoscales reached its maximum.During the MCS weakening phase,the large-scale system and the α mesoscale system have a certain inhibitory effect on the β mesoscale system at the middle and upper levels,thus weakening the development of the β mesoscale system.In this process,the β mesoscale scale system acts as the direct cause of precipitation,while the positive center of kinetic energy change corresponds to the large precipitation center.