E-136 傾圧不安定と積雲対流との相互作用で発達する低気圧の数値実験

概要

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"Polar lows" are meso-scale cyclones that develop over high-latitude oceans in cold seasons. Since polar lows exhibit a variety of cloud patterns such as quasi-axisymmetric spiral shape and comma shape, their development mechanism have attracted a number of meteorologists. One of the possible candidates for their development mechanism is a baroclinic instability incorporated with the effect of convective heating. Performed is a high-resolution numerical experiment on polar low developments within simplified environments, in which both baroclinicity and condensational heating are present, where the convective heating is incorporated in a much more reliable manner than in the previous studies. Our result shows that a spiral cloud pattern is formed in an environment without baroclinicity, while a comma cloud pattern, in a baroclinic environment. The relationship among their growth rate, structure and their development mechanism is also clarified.
日本流体力学会の論文
2003-07-28