Abstract An analysis of the kinetic energy budget during a case of interaction between middle latitude and extratropical cyclones has been made in this work. Horizontal flux convergence constitutes a major energy sink. Generation of kinetic energy via cross-contour flow is a persistent source throughout the growth and decay periods. Dissipation of kinetic energy from subgrid to grid scales is an important source during the pre-storm period; it acts as a sink during the growth and decay periods. The major contribution to kinetic energy comes from a persistent upper tropospheric jet stream activity throughout the period of the cyclone development. The characteristics of moisture-flux components (divergent and rotational) along with precipitable water content for different tropospheric layers throughout the life cycle of our cyclone are also studied in this work. It is found that most of required humidity for our cyclone are initiated from Arabian Sea and then to some extent are reinforced over Gulf of Aden and east of central Africa and then by passing over Red sea enter to the south and south east of Mediterranean Sea. The rotational component of the moisture transport brings moisture from two regions; the first which is considered the main region is the Indian Ocean, Arabian Sea, Gulf of Aden and north east of Sudan. The second source region is the Atlantic and Mediterranean Sea. In the middle troposphere, the primary moisture source is found over central Africa, which in turn is traced to the Atlantic Ocean, the Indian Ocean, and the Arabian Sea. The upper-level moisture fluxes are weak and play a minor role over the area of interaction between two cyclones.

中文翻译：

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两个气旋系统相互作用期间的动能收支和水分通量收敛分析：案例研究

摘要 本文对中纬度气旋与温带气旋相互作用时的动能收支进行了分析。水平通量会聚构成了主要的能量汇。通过交叉轮廓流动产生的动能是整个生长和衰退时期的持久来源。从次电网到电网尺度的动能耗散是风暴前时期的一个重要来源；它在生长和衰退期间充当汇。动能的主要贡献来自整个气旋发展期间持续存在的对流层高层急流活动。这项工作还研究了气旋整个生命周期中不同对流层层的水分通量成分（发散和旋转）的特征以及可降水量。发现我们的气旋所需的大部分湿度是从阿拉伯海开始的，然后在亚丁湾和中非东部得到一定程度的加强，然后通过红海进入地中海南部和东南部。水分输送的旋转分量从两个区域带来水分；第一个被认为是主要地区是印度洋、阿拉伯海、亚丁湾和苏丹东北部。第二个源区是大西洋和地中海。在对流层中层，主要水分来源位于非洲中部，这反过来又可以追溯到大西洋、印度洋和阿拉伯海。上层水分通量很弱，在两个气旋之间的相互作用区域中起次要作用。