台風が温帯低気圧化後急速に再発達するときの構造と環境場

Abstract

Typhoons often reintensify after their transition to extratropical cyclones. In order to analyze the evolution of cyclone structure during reintensification, the typhoons which rapidly reintensified after extratropical transition were examined in view of describing the cyclone phase space (CPS) a recently developed tool to analyze cyclone structure. We found two different patterns of the cyclone evolution after extratropical transition in the CPS. One is characterized by strong cold-core structure (cold-core), and the other by warm-core structure without experiencing strong cold-core structure (warm-seclusion). The cold-core first showed strong cold-core structure, but eventually transformed to warm-core structure. Thus, the difference of two patterns can be said to be the transformation period from extratropical transition to warm-core structure, and is suggested to be related with the trough.