Kinetic energy budget and moisture flux convergence analysis during interaction between two cyclonic systems: Case study |
| |
| Institution: | 1. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;2. Department of Oceanography, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;3. Naval Ocean Analysis and Prediction Laboratory, Naval Postgraduate School, Monterey, CA 93943, USA;4. Institute of Maritime Information and Technology, National Kaohsiung Marine University, Kaohsiung 80543, Taiwan;5. Scripps Institution of Oceanography, La Jolla, CA 92093-0213, USA;1. BASF SE, Carl-Boschstr. 38, 67063 Ludwigshafen, Germany;2. Fraunhofer Institute for Industrial Mathematics ITWM, Fraunhofer-Platz 1, 67663 Kaiserslautern, Germany;3. Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin- Schrödinger-Str. 44, 67663 Kaiserslautern, Germany |
| |
| 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. |
| |
| Keywords: | Kinetic energy budget Cyclogenesis Divergent and rotational wind Generation of kinetic energy Moisture flux convergence Horizontal flux divergence |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
