一次MCS的尺度分离动能分析

An Analysis of the Scale-Separated Kinetic Energy of A Mesoscale Convective System

利用尺度分离动能方法对１９９４年６月１１日０９ＵＴＣ－１２日１０ＵＴＣ影响湖南省的一次ＭＣＳ进行了研究，结果表明：１．大尺度运动中非地转风以及两种尺度间风场与气压场的相互作用产生的动能，是这次ＭＣＳ的主要能源；２．中尺度动能以及两种尺度风场相互作用的动能，随ＭＣＳ发展（减弱）而增加（减小）；３．在ＭＣＳ的整个发展阶段，高层的总体动能锐减。

A mesoscale convective system(MCS)influenced Hunan Province during 11, 0900 -12, 1000 UTC June 1994 has been studied by the use of the scale separated kinetic energy. Results showed that (1 ) the kinetic energy generated by the ageostrophic flow in large scale motion field and by the interaction between the flow and pressure fields of the large-and meso-scale motions is the dominant source of energy; (2) the kinetic energy of the mesoscale motion and of the interaction between large-and meso-scale flow fields increases (decreases) with the MCS's development (fading);(3) the total kinetic energy of upper troposphere drastically reduced during the MCS's development phase.