Toward the Estimation of Tropical Cyclone Wind Structure in the Western North Pacific

Udai Shimada

Presentation information

[E] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS04] Advances in Tropical Cyclone Research: Past, Present, and Future

Tue. May 23, 2023 9:00 AM - 10:15 AM 103 (International Conference Hall, Makuhari Messe)

convener:Satoki Tsujino(Meteorological Research Institute), Sachie Kanada(Nagoya University), Kosuke Ito(University of the Ryukyus), Yoshiaki Miyamoto(Faculty of Environment and Information Studies, Keio University), Chairperson:Satoki Tsujino(Meteorological Research Institute), Sachie Kanada(Nagoya University)

9:30 AM - 9:45 AM

[AAS04-03] Toward the Estimation of Tropical Cyclone Wind Structure in the Western North Pacific

*Udai Shimada¹ (1.Meteorological Research Institute)

Keywords:Tropical cyclone, Wind structure

Information on tropical cyclone (TC) wind structure [e.g., the radius of maximum wind (RMW), radii of 30 and 50 kt, and asymmetric structure] is essential for both disaster prevention and deepening scientific understanding of TCs. In the western North Pacific (WNP), however, it has been hard to estimate TC wind structure in the inner core, including the RMW and asymmetric structure, due to the lack of high wind field observations. Recently, with the advent of synthetic aperture radar (SAR), it has become possible to observe very high wind speeds with high spatial resolution from space. In this study, we began to develop a method for the estimation of TC wind structure in TCs in the WNP. As a first step, we examined the feasibility of a regression approach to estimate a TC wind field and the RMW based on the statistical relationship between wind structure parameters from SAR, numerical model wind fields, and satellite cloud patterns. The results show that while it has a limitation of small sample size, the approach was found promising.