Spontaneous Aggregation and Cyclogenesis without Surface Friction.
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| Title: | Spontaneous Aggregation and Cyclogenesis without Surface Friction. |
|---|---|
| Authors: | Ye, Hexin1 (AUTHOR), Ma, Zhanhong1 (AUTHOR) mazhanhong17@nudt.edu.cn, Lin, Yanluan2 (AUTHOR), Fei, Jianfang1 (AUTHOR) |
| Source: | Journal of the Atmospheric Sciences. 2026, Vol. 83 Issue 4, p1-24. 24p. |
| Subjects: | Cyclogenesis, Friction, Atmospheric models, Potential energy, Tropical cyclones, Boundary layer equations, Physics |
| Abstract: | In a rotating radiative-convective equilibrium framework, tropical cyclones (TCs) can spontaneously emerge through convective self-aggregation process. Despite the deepening understanding of multiple feedbacks involved, the role of surface friction remains inconclusive. In this study the potential influence of surface friction on spontaneous TC genesis is investigated using idealized cloud-resolving simulations. Two simulation ensembles with and without surface friction are performed, initialized from homogeneous and quiescent environments. We find that spontaneous TC genesis occurs in both ensembles, but advances by 12–14 days if there is no surface friction. Available potential energy (APE) analysis reveals that APE growth is more rapid without surface friction due to enhanced convection activities at the early stage. This faster energy growth is primarily driven by unimpeded cold pool front collisions that promote boundary-layer convergence and convective initiation and organization—a process suppressed by frictional damping of frontal velocities. Both ensembles develop coherent midlevel vortices ~8 days prior to genesis, exhibiting synchronous structural evolutions with comparable moisture inflow until genesis. After genesis, surface friction leads to a stronger storm development by forcing stronger vortex organization and boundary-layer moisture inflow as midlevel air saturates. However, moisture supply without friction cannot sustain the moisture consumption in the inner core, and leads to a much weaker storm intensity and shortened lifespan. By bridging convective self-aggregation theory with boundary-layer dynamics, these results reveal a dual-phase regulation mechanism of surface friction, highlighting the interplay between dynamic and thermodynamic controls in TC genesis. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of the Atmospheric Sciences is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 193865985 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Spontaneous Aggregation and Cyclogenesis without Surface Friction. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ye%2C+Hexin%22">Ye, Hexin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ma%2C+Zhanhong%22">Ma, Zhanhong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mazhanhong17@nudt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Lin%2C+Yanluan%22">Lin, Yanluan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fei%2C+Jianfang%22">Fei, Jianfang</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+the+Atmospheric+Sciences%22">Journal of the Atmospheric Sciences</searchLink>. 2026, Vol. 83 Issue 4, p1-24. 24p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cyclogenesis%22">Cyclogenesis</searchLink><br /><searchLink fieldCode="DE" term="%22Friction%22">Friction</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+models%22">Atmospheric models</searchLink><br /><searchLink fieldCode="DE" term="%22Potential+energy%22">Potential energy</searchLink><br /><searchLink fieldCode="DE" term="%22Tropical+cyclones%22">Tropical cyclones</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+equations%22">Boundary layer equations</searchLink><br /><searchLink fieldCode="DE" term="%22Physics%22">Physics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In a rotating radiative-convective equilibrium framework, tropical cyclones (TCs) can spontaneously emerge through convective self-aggregation process. Despite the deepening understanding of multiple feedbacks involved, the role of surface friction remains inconclusive. In this study the potential influence of surface friction on spontaneous TC genesis is investigated using idealized cloud-resolving simulations. Two simulation ensembles with and without surface friction are performed, initialized from homogeneous and quiescent environments. We find that spontaneous TC genesis occurs in both ensembles, but advances by 12–14 days if there is no surface friction. Available potential energy (APE) analysis reveals that APE growth is more rapid without surface friction due to enhanced convection activities at the early stage. This faster energy growth is primarily driven by unimpeded cold pool front collisions that promote boundary-layer convergence and convective initiation and organization—a process suppressed by frictional damping of frontal velocities. Both ensembles develop coherent midlevel vortices ~8 days prior to genesis, exhibiting synchronous structural evolutions with comparable moisture inflow until genesis. After genesis, surface friction leads to a stronger storm development by forcing stronger vortex organization and boundary-layer moisture inflow as midlevel air saturates. However, moisture supply without friction cannot sustain the moisture consumption in the inner core, and leads to a much weaker storm intensity and shortened lifespan. By bridging convective self-aggregation theory with boundary-layer dynamics, these results reveal a dual-phase regulation mechanism of surface friction, highlighting the interplay between dynamic and thermodynamic controls in TC genesis. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of the Atmospheric Sciences is the property of American Meteorological Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1175/JAS-D-25-0069.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 1 Subjects: – SubjectFull: Cyclogenesis Type: general – SubjectFull: Friction Type: general – SubjectFull: Atmospheric models Type: general – SubjectFull: Potential energy Type: general – SubjectFull: Tropical cyclones Type: general – SubjectFull: Boundary layer equations Type: general – SubjectFull: Physics Type: general Titles: – TitleFull: Spontaneous Aggregation and Cyclogenesis without Surface Friction. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ye, Hexin – PersonEntity: Name: NameFull: Ma, Zhanhong – PersonEntity: Name: NameFull: Lin, Yanluan – PersonEntity: Name: NameFull: Fei, Jianfang IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00224928 Numbering: – Type: volume Value: 83 – Type: issue Value: 4 Titles: – TitleFull: Journal of the Atmospheric Sciences Type: main |
| ResultId | 1 |
