B114 傾圧不安定下で発生する水平渦の特徴的な構造

概要

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Vortical structure changing by the life cycles of the horizontal vortices (extratropical cyclones) are investigated with various satellite images and meteorological data. From a series of the satellite images taken through the frontgenesis to cyclogenesis, it is recognized that the cyclones are constructed with a number of mesoscale vortices (≧30 km horizontal scales or more large), where arranged along the wave-like front, lived among longitudinal convection in warm sector, gathered around the head of wave-like front to be yield cyclonic circulation. Also in the increasing stage of cyclones, it can be seen many meso-vortices flow into the cyclones. It is understood that 1. the cyclones are a compounded vortices consisted of many meso-vortices because a circulation more than larger meso-vortex is hard to build due to a strong vertical shear in baroclinic atmosphere, 2. cyclonic circulation which will be yielded at the west side of the head of wave-like front do not occur without mesovortices. 3. Extratropical cyclones do not increases without meso-vortices which flow into the cyclones.
日本流体力学会の論文
2001-07-31