Characteristics of the Long‐Lived Concentric Eyewalls in Tropical Cyclones

Yang, Yi-Ting; Kuo, Hung‐Chi; Tsujino, Satoki; Chen, Buo‐Fu; Peng, Melinda S.

doi:10.1029/2020jd033703

Cited by 8 publications

(12 citation statements)

References 41 publications

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“…Thus, the IEP is not sensitive to the parameters of the outer eyewall. As discussed in Yang et al (2021), the long-lived CEs maybe with a dynamically active outer eyewall with a wide width. Our results from Figures 2 and 3 will not be compromised by the presence of the wide dynamically active outer eyewall.…”

Section: Numerical Resultsmentioning

confidence: 93%

“…Yang et al. (2021) examines the long‐lived CE structure in TCs in different basins and find that the long‐lived CE tends to have a larger size, mainly contributed by a larger moat and a larger outer eyewall width. The WNP has far more long‐lived CEs than in ATL and in EPAC.…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%

“…Yang et al. (2021) suggest that larger outer eyewall width often contains more cloud liquid water and maybe with more massive latent heat release. The geostrophic adjustment dynamics suggest that convection embedded in a wider outer eyewall (wide inertial stable region) favors the mass response from the convective heating and generates more kinetic energy in the form of gradient wind balance.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al. (2021) investigated the duration of TC CEs in different basins from microwave satellite imagery during 1997–2014. Their duration and structural parameters, including inner eyewall size, moat width, and outer eyewall width, were calculated.…”

Section: Introductionmentioning

confidence: 99%

“…Another dissipation mechanism suggested that the development of an outer eyewall contributes to the inner eyewall demise by interrupting its low-level inflow (Houze et al, 2007;Samsury & Zipser, 1995) and the stabilization of inner eyewall convection (Rozoff et al, 2008). Yang et al (2021) suggest that larger outer eyewall width often contains more cloud liquid water and maybe with more massive latent heat release. The geostrophic adjustment dynamics suggest that convection embedded in a wider outer eyewall (wide inertial stable region) favors the mass response from the convective heating and generates more kinetic energy in the form of gradient wind balance.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Scaling Law for Boundary Layer Inner Eyewall Pumping in Concentric Eyewalls

Kuo

Tsujino²,

Hsu³

et al. 2022

JGR Atmospheres

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This study explains why observed storms with long concentric eyewall (CE) duration often have a large moat size. A series of slab boundary layer model experiments are conducted with the free atmosphere forcing from different CE structures. The experimental results indicate that the inner eyewall pumping (IEP), the maximum vertical motion at the inner eyewall region, increases with the increase in moat size d and vortex maximum wind vm, the decrease in the inner eyewall radius rm, and increase in inner eyewall vorticity. A scaling law is derived from hundreds of SBL experiments with four variables: IEP win, vortex inner radius rm, vortex maximum wind vm, and moat size d. The dimensionless scaling law is w∗∼d∗, ${w}^{\ast }\sim \sqrt{{d}^{\ast }},$ where w∗ = win/vm, d∗ = ζd/c, ζ is the vorticity 2vm/rm, and c is a constant gravity wave speed. The moat size divided by the Rossby length c/ζ, the dimensionless moat size d∗, combines the effect of the moat size and the vortex pressure gradient force to accelerate the inflow and to enlarge the IEP for inner eyewall convection maintenance. A phase diagram of IEP with vortex structure dimensionless moat ζd/c and vortex intensity vm is constructed based on the scaling law for the aircraft and satellite observations. The eyewall replacement cycle may be viewed as the process to reduce the IEP from the decrease of the vortex intensity and the vortex size of the dimensionless moat. This leads to the ultimate disappearance of the inner eyewall.

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Section: Numerical Resultsmentioning

confidence: 93%

Section: Summary and Concluding Remarksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Scaling Law for Boundary Layer Inner Eyewall Pumping in Concentric Eyewalls

Kuo

Tsujino²,

Hsu³

et al. 2022

JGR Atmospheres

Self Cite

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Research advances on internal processes affecting tropical cyclone intensity change from 2018–2022

Chen

Rozoff

Rogers

et al. 2023

Tropical Cyclone Research and Review

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A Diagnostic Study on the Formation of Double Eyewalls of Typhoon Lekima (2019) Based on POES Microwave and GOES Infrared Observations

Hu,

Zou

2023

Earth and Space Science

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Microwave observations of brightness temperature (TB) from multiple polar‐orbiting operational environmental satellite imagers and infrared observations of geostationary operational environmental satellite Himawari‐8 imager are used to investigate characteristic features of secondary eyewall evolution of Typhoon Lekima (2019). It is found that microwave observations showed a longer duration time of concentric double eyewalls than Advanced Himawari Imager (AHI) infrared observations, due to a stronger cloud penetration capability of microwave than infrared observations. The AHI infrared observations with high temporal and horizontal resolutions captured several actively propagating inner spiral rainbands before the secondary eyewall formation (SEF) of Lekima (2019). They are characterized by a wavenumber‐1 asymmetry propagating radially outward and wavenumbers‐2 and ‐3 asymmetries propagating anticlockwise. The wavenumber‐2 asymmetry approximates an azimuthal phase speed of wavenumber‐2 vortex Rossby wave. Later, an outer spiral rainband experienced an obvious axisymmetrization, then merged with multiple inner spiral rainbands propagating radially outward from the primary eyewall. The stagnation radius of these inner spiral rainbands coincides with the location of the highly symmetric outer spiral rainband, which accelerated the SEF. It is suggested that the SEF of Typhoon Lekima (2019) results from a concerted activity of inner and outer spiral rainbands.

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Characteristics of the Long‐Lived Concentric Eyewalls in Tropical Cyclones

Cited by 8 publications

References 41 publications

Scaling Law for Boundary Layer Inner Eyewall Pumping in Concentric Eyewalls

Scaling Law for Boundary Layer Inner Eyewall Pumping in Concentric Eyewalls

Research advances on internal processes affecting tropical cyclone intensity change from 2018–2022

A Diagnostic Study on the Formation of Double Eyewalls of Typhoon Lekima (2019) Based on POES Microwave and GOES Infrared Observations

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