Mechanism of secondary eyewall formation in tropical cyclones revealed by sensitivity experiments on the mesoscale descending inflow

Kyohei Kasami; Satoh, Masaki

doi:10.51094/jxiv.403

##article.authors##

Kyohei Kasami Atmosphere and Ocean Research Institute, The University of Tokyo
Satoh, Masaki Atmosphere and Ocean Research Institute, The University of Tokyo

DOI:

https://doi.org/10.51094/jxiv.403

キーワード:

tropical cyclone、 secondary eyewall formation、 eyewall replacement cyclone、 mesoscale descending inflow

抄録

An eyewall replacement cycle is often seen in tropical cyclones, when a secondary eyewall forms outside the inner eyewall, and the inner eyewall disappears. Although this cycle significantly affects the intensity of tropical cyclones, the mechanisms of secondary eyewall formation (SEF) are unclear. Some studies have suggested that dry air inflow and diabatic cooling may have an important role in SEF via the mesoscale descending inflow (MDI). Here, we use numerical experiments to investigate the role of the middle and upper tropospheric dry inflow in SEF. Idealized experiments were conducted using the plane version of the nonhydrostatic icosahedral atmospheric model. Control experiments produced SEF with a dry air inflow in the middle and upper troposphere and associated MDI. In sensitivity experiments, in which the water vapor in the middle and upper troposphere was increased in the outer areas of the tropical cyclone, SEF was hindered and slowed down. These results reveal the role of the middle and upper troposphere dry inflow and associated MDI in SEF.

利益相反に関する開示

The authors have no conflicts of interest to declare.

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