暴雨中尺度环境场的总动能收支

利用一套分辨率较高的中尺度实验观测资料，对一次暴雨过程的中尺度环境场进行了总动能平衡的诊断研究，讨论了对流活跃和非活跃两个时期动能平衡过程的差异．结果表明，暴雨的能量过程很活跃，非地转运动的绝热耗损和动能的向外界辐散是暴雨过程的主要能汇，而次网格尺度向网格尺度的运动动能转换，是环境场动能的主要能源；暴雨区对流层高层的能量过程比低层活跃，高层急流对环境场动能平衡过程有很大作用．比较对流活跃和非活跃２个时次的动能平衡过程发现，暴雨过程的动能平衡与对流强度变化有联系，２个不同时段的动能平衡过程有差异，尤其在中层这种差异更明显．

Budget of Total Kinetic Energy of Heavy Rainfall Mesoscale

The total kinetic energy balance of heavy rainfall mesoscale environment is studied with a set of high resolvable data of mesoscale experiment. Area time averaged results indicate that energetic process in the heavy rainfall mesoscale environment is active, characterized by cross contour dissipation, horizontal flux divergence, and transfers of energy from subgrid to grid scale motion. Subgrid effects are considered to be the cumulus convection in the case. Energetic process is more active in upper layer than in lower layer. The upper layer jet stream has great effect on the balance of kinetic energy. Difference of kinetic energy balance between strong convective and weak convective situations is also studied. It is found that the energetic processes in the two situations are different.Great cross contour dissipation and energy transfer from subgrid to grid scale motion are found in the mid layer troposphere in the strong convective situation.