Objective Identification and Basic Characteristics of Landfalling Hollow Typhoon in Guangdong
ZHANG Yumin
CHENG Zhengquan
CAI Jingjiu
GUO Chunya
Abstract：To explore the basic characteristics and patterns of landfalling hollow typhoons in Guangdong,this paper constructs an objective identification algorithm for landfalling hollow typhoons based on real-time wind field and tropical cyclone(TC)track data.Utilizing this algorithm,we identified hollow typhoons that made landfall in Guangdong from 2008 to 2022 and conducted a statistical analysis of their basic characteristics.The study found that all hollow typhoons that landed in Guangdong in the past 15 years originated from the central-northern South China Sea and the western part of the western Pacific Ocean.The highest proportion of landfalls occurred in western Guangdong(68%),with the majority concentrating during the late summer to autumn period(75%).These typhoons can be classified into four types:northwestward,westward,northward,and complex,with the northwestward type being the most prevalent(62.5%).Further statistical analysis reveals that for hollow typhoons making landfall on the eastern side of the Pearl River Estuary and in the area from the northeast of the Leizhou Peninsula to Maoming,the main gale regions are often distributed within a range of 80-160 km from the typhoon center.Conversely,for those making landfall in the southern part of Leizhou Peninsula,the gale regions are frequently distributed approximately 100-260 km from the center.The research also shows that hollow typhoons tend to be larger in size compared to normal TCs,and weaker TCs are more conducive to the formation of hollow structures.Furthermore,the difference between the inner-circle wind force and the central wind force of hollow typhoons tends to increase with the enhancement of landfall intensity.Composite analysis indicates that there is no significant difference in the large-scale circulation background between hollow typhoons and non-hollow typhoons.
Keywords：tropical cyclonehollow typhoonobjective algorithmgale
Publication Date：2025-10-25
Online Publishing Date：2025-11-25(First online date of this platform, not the publication date of the document)
Pages：11( 670-680 )