DOI: https://doi.org/10.2151/sola.2024-009
Mechanism of secondary eyewall formation in tropical cyclones revealed by sensitivity experiments on the mesoscale descending inflow
DOI:
https://doi.org/10.51094/jxiv.403Keywords:
tropical cyclone, secondary eyewall formation, eyewall replacement cyclone, mesoscale descending inflowAbstract
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.
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Submitted: 2023-06-06 16:32:21 UTC
Published: 2023-06-08 09:20:48 UTC
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Copyright (c) 2023
Kyohei Kasami
Masaki Satoh
This work is licensed under a Creative Commons Attribution 4.0 International License.
