Environmental Influences on the Intensity and Configuration of Tropical Cyclone Concentric Eyewalls in the Western North Pacific

[摘要]  Using brightness temperature data from passive microwave satellite imagery, this study examines tropical cyclones (TCs) with concentric eyewall (CE) in the western North Pacific between 1997 and 2011. The identified CEs are divided into two types according to the characteristics of the eyewall replacement cycle (ERC) in the microwave imagery: a CE with a typical ERC (T-ERC) and a CE without an ERC (N-ERC). It is indicated that 88% T-ERCs reach peak intensity near (0.2 h after on average) CE formation, whereas 90% N-ERCs reach peak intensity prior to (22.0 h on average) CE formation.

[学科分类] 大气科学

[关键词] concentric eyewall;tropical cyclone;intensity change;environmental configuration