摘要
计算了暴雨区涡旋动能的收支．分析表明：非地转运动产生和水平辐合输送以及平均动能转换的涡旋动能是扰动发展、维持的动能来源．摩擦项是扰动的主要能汇．在能源项中，涡旋动能的制造项起主要作用，其中斜压转换有很大贡献，暴雨区中尺度扰动具有较强的斜压性质．在垂直方向上，高、低层涡旋动能与平均动能之间有较大的相互转换，低层动能由扰动向平均气流转换，为环境场提供能源，而在高层，扰动从平均气流获得动能．此外还给出了暴雨区可能的一种尺度相互作用过程．
The balance of kinetic energy is studied for the transient disturbances connected with the mesoscale system in a heavy rainfall area. Areatime analysis results indicate that the crossisobaric generation, horizontal transport of eddy kinetic energy, and energy conversion from the areamean kinetic energy to eddy kinetic energy are main energy sources, which have great contribution to the development of the mesoscale disturbances. The eddy dissipation obtained as the residual term of eddy kinetic energy equation shows negative values in the whole layer, being considered as a main energy sink. Among those source terms, eddy generation term appears to be the major one, in which the baroclinic conversion has a great contribution. The mesoscale disturbance in the heavy rain fall area is considered having strong baroclinic characteristic. More conversions of energy occured between basic flow and eddy flow are found in the upper and lower layer troposphere. Eddy flow transfers energy to the basic flow in the lower layer, and gains energy from the basic flow in the upper layer. A possible interaction process among different scale motions in the heavy rain fall area is given.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
1998年第4期98-102,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
关键词
涡旋动能
暴雨
中尺度环境场
eddy kinetic energy, heavy rainfall, mesoscale environment
