The Spiral Bands of a Hurricane: A Possible Dynamic Explanation

Abdullah, Abdul Jabbar

doi:10.1175/1520-0469(1966)023<0367:tsboah>2.0.co;2

Cited by 33 publications

(24 citation statements)

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“…suggested by Abdullah 11 and others, 13 though some continuing sonic excitation might be possible from outgoing waves if the source is sufficiently intense.…”

Section: Outgoing Wave-fronts Formed In the Eyewallmentioning

confidence: 89%

“…This means that exciting even a pure axial sound wave produces r and fluctuations because they are all interrelated by the conservation of angular momentum. It may be that transverse inertia-gravity waves between temperature layers in the atmosphere, which some have associated with spiral rainbands, 11 provide just such a mechanism for pumping the axial mode. So once a rain cloud is formed, some internal modes will doubtless be excited.…”

Section: Resonant Modesmentioning

confidence: 99%

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Acoustical origin of rainbands in an ideal tropical hurricane

Elder

2006

The Journal of the Acoustical Society of America

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An acoustical model of hurricane rainband formation is proposed. Self-excited acoustic resonance inside the spinning eye produces strong azimuthal and radial standing waves. These modes can cause large temperature fluctuations about the dew point which are believed to be responsible for observed dry/wet bands in the outer storm disk. Distortion of standing wavefronts into spirals occurs in the transition layer region between approximately geostrophic flow inside the eyewall and irrotational flow outside. Tonal emissions from hurricane eyes should be detectable at great distances and are likely to be in a range below 0.01 Hz.

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“…suggested by Abdullah 11 and others, 13 though some continuing sonic excitation might be possible from outgoing waves if the source is sufficiently intense.…”

Section: Outgoing Wave-fronts Formed In the Eyewallmentioning

confidence: 89%

Section: Resonant Modesmentioning

confidence: 99%

Acoustical origin of rainbands in an ideal tropical hurricane

Elder

2006

The Journal of the Acoustical Society of America

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“…Tepper [13] pointed out that gravity wave originates from near tropical cyclones eye wall, and propagates in the form of spiral rainbands. Abdullah [14] holds that spiral cloud bands appear near the center of tropical cyclone, and travel outwards at a speed of 83m/s, which is much faster than what is actually measured in the atmosphere. After analyzing the development process of spiral disturbance, Kurihara [15] demonstrates that there is an outward disturbance in tropical cyclone, which gains momentum from the mean stream and horizontal shear (baroclinicity).…”

Section: Atmospheric Fluctuation Analysismentioning

confidence: 92%

Study on wavy distribution of rainfall associated with typhoon Matsa (2005)

Wang

Chen

et al. 2007

CHINESE SCI BULL

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An analysis is made to investigate the structure features of the extensive heavy rainfall left by typhoon Matsa, after its landfall in mainland China in August 2005, based on a range of observational results, including surface intensive observation data, TBB data from China's FY-2 satellite, and NCEP 1°×1° reanalysis data. The study tries to explore the interaction between atmospheric waves, 3-D atmospheric structures, and typhoon rainbands. Observational facts, diagnostic analysis, and atmospheric wave theory are used to look into the formation mechanism of distant typhoon rainbands. Results show that (1) Matsa rainbands have the features of noticeable wave train distribution and long distance propagation; (2) the typhoon rainbands extend as far as 2000 km northwardly from the typhoon center, with a wavelength of 500-1000 km and a wave period of 12-24 h; (3) the wave structure of Matsa rainbands is closely associated with the corresponding wave variation of the ambient 3-D atmospheric structures, including disturbance vorticity, divergence field, vertical motion field, water vapor flux divergence field, etc. (4) both observational facts and theoretical analysis show that the northward extending typhoon rainbands are associated with the mixed effects of atmospheric inertia wave and internal gravity wave; (5) only under proper atmospheric stratification and vertical wavenumber of gravity wave, can a typhoon stimulate such a wave being able to reach such a distance, and result in extending wavy rainbands.

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“…Two main theories have been proposed to explain the physics of typhoon spiral bands (Abdullah 1966, Kurihara and Tuleya 1974, Kurihara 1976, Guinn and Schubert 1993, MacDomald 1968. But for absence of high-resolution information on typhoon structure, or in another word, for limitation of sounding techniques on inner-typhoon cloud structure, it is very difficult to further recognize the dynamic transportation characteristics of typhoon.…”

Section: Introductionmentioning

confidence: 99%

The Dynamic Characteristics of Typhoon Vortex Spiral Waves and Its Transportation: Diagnostic Analyses

Xu¹,

Zhang²,

Chen³

et al. 2004

Chinese J of Geophysics

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By adopting the moving‐coordinate on the typhoon center, the TBB time‐serial datasets of three target typhoons are analyzed through power‐spectrum analysis to investigate the wave train characteristics of typhoon spiral cloud bands. The results show that the TBB correlation coefficient field between the typhoon eye region and its surrounding areas has a remarkable spiral wave feature. The spiral waves in typhoon‐effected regions also show a conspicuous sub‐synoptic scale and meso‐scale characteristic, and their wave period and phase speed exhibit two peak values, one similar to internal gravity wave of over the 6h time scale and the other to the vortex Rossby wave of about 24h time scale. The high‐ and low‐level streams of typhoon spiral bands have close relation with its persistence and development. Besides, the TBB time departures show waves similar to the vortex Rossby wave train, and the wave path is similar to the Rossby wave transportation path too. Finally, a structure model of typhoon vortex spiral waves is put forward.

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The Spiral Bands of a Hurricane: A Possible Dynamic Explanation

Cited by 33 publications

References 0 publications

Acoustical origin of rainbands in an ideal tropical hurricane

Acoustical origin of rainbands in an ideal tropical hurricane

Study on wavy distribution of rainfall associated with typhoon Matsa (2005)

The Dynamic Characteristics of Typhoon Vortex Spiral Waves and Its Transportation: Diagnostic Analyses

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