Ground-based Doppler radar observations of wave-like coherent structures along the inner edge of the tropical cyclone eyewall.
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| Title: | Ground-based Doppler radar observations of wave-like coherent structures along the inner edge of the tropical cyclone eyewall. |
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| Authors: | Yunge, Jimmy1 (AUTHOR) jyunge@elms.hokudai.ac.jp, Nolan, David S.1 (AUTHOR) |
| Source: | Monthly Weather Review. Jun2026, Vol. 154 Issue 6, p1-25. 25p. |
| Subjects: | Doppler radar, Coherent structures, Boundary layer equations, Vertical wind shear, Tropical cyclones |
| Geographic Terms: | North Atlantic Ocean |
| Abstract: | Observational and numerical studies of intense tropical cyclones (TCs) have occasionally noted the existence of small-scale vortical eddies along the inner edge of the eyewall in the lower and middle troposphere, which appear in plan view radar reflectivity as closely spaced filamentary, cellular, lobed, or scalloped echoes protruding inward from the primary eyewall convective ring. Using high-resolution NEXRAD data, this study examines qualitative characteristics of these wave-like coherent structures in case studies of three Atlantic hurricanes. Signatures of these coherent structures in radar base moment data, including their wave-like echo pattern, Doppler velocity perturbations, and elevated spectrum widths, are generally most pronounced at lower radar elevations and diminish with altitude. The wave-like echoes are associated with alternating positive-negative values of azimuthal Doppler velocity shear, with individual small-scale reflectivity structures approximately collocated with enhanced positive (cyclonic) azimuthal shear. These patterns, albeit sensitive to sampling factors, formed the basis from which similar wave-like structures were identified in eleven additional North Atlantic and Pacific TCs. These coherent structures were found predominantly to the left (for Northern Hemispheric storms) of the environmental vertical wind shear vector, forward and left of storm motion, and in offshore flow, implying a role of asymmetric boundary layer dynamics in their development. Our results indicate that these coherent structures are not unique to high-end TCs, and the wide range of storm structure and environments over which these structures appeared suggests that they are an intrinsic element of TC inner-core dynamics and may constitute a distinct class of TC features. [ABSTRACT FROM AUTHOR] |
| Copyright of Monthly Weather Review 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: 194578207 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ground-based Doppler radar observations of wave-like coherent structures along the inner edge of the tropical cyclone eyewall. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Yunge%2C+Jimmy%22">Yunge, Jimmy</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jyunge@elms.hokudai.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Nolan%2C+David+S%2E%22">Nolan, David S.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Monthly+Weather+Review%22">Monthly Weather Review</searchLink>. Jun2026, Vol. 154 Issue 6, p1-25. 25p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Doppler+radar%22">Doppler radar</searchLink><br /><searchLink fieldCode="DE" term="%22Coherent+structures%22">Coherent structures</searchLink><br /><searchLink fieldCode="DE" term="%22Boundary+layer+equations%22">Boundary layer equations</searchLink><br /><searchLink fieldCode="DE" term="%22Vertical+wind+shear%22">Vertical wind shear</searchLink><br /><searchLink fieldCode="DE" term="%22Tropical+cyclones%22">Tropical cyclones</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22North+Atlantic+Ocean%22">North Atlantic Ocean</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Observational and numerical studies of intense tropical cyclones (TCs) have occasionally noted the existence of small-scale vortical eddies along the inner edge of the eyewall in the lower and middle troposphere, which appear in plan view radar reflectivity as closely spaced filamentary, cellular, lobed, or scalloped echoes protruding inward from the primary eyewall convective ring. Using high-resolution NEXRAD data, this study examines qualitative characteristics of these wave-like coherent structures in case studies of three Atlantic hurricanes. Signatures of these coherent structures in radar base moment data, including their wave-like echo pattern, Doppler velocity perturbations, and elevated spectrum widths, are generally most pronounced at lower radar elevations and diminish with altitude. The wave-like echoes are associated with alternating positive-negative values of azimuthal Doppler velocity shear, with individual small-scale reflectivity structures approximately collocated with enhanced positive (cyclonic) azimuthal shear. These patterns, albeit sensitive to sampling factors, formed the basis from which similar wave-like structures were identified in eleven additional North Atlantic and Pacific TCs. These coherent structures were found predominantly to the left (for Northern Hemispheric storms) of the environmental vertical wind shear vector, forward and left of storm motion, and in offshore flow, implying a role of asymmetric boundary layer dynamics in their development. Our results indicate that these coherent structures are not unique to high-end TCs, and the wide range of storm structure and environments over which these structures appeared suggests that they are an intrinsic element of TC inner-core dynamics and may constitute a distinct class of TC features. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Monthly Weather Review 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/MWR-D-25-0203.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 25 StartPage: 1 Subjects: – SubjectFull: Doppler radar Type: general – SubjectFull: Coherent structures Type: general – SubjectFull: Boundary layer equations Type: general – SubjectFull: Vertical wind shear Type: general – SubjectFull: Tropical cyclones Type: general – SubjectFull: North Atlantic Ocean Type: general Titles: – TitleFull: Ground-based Doppler radar observations of wave-like coherent structures along the inner edge of the tropical cyclone eyewall. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Yunge, Jimmy – PersonEntity: Name: NameFull: Nolan, David S. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00270644 Numbering: – Type: volume Value: 154 – Type: issue Value: 6 Titles: – TitleFull: Monthly Weather Review Type: main |
| ResultId | 1 |
