The inner core thermodynamics of the tropical cyclone boundary layer

Williams, Gabriel J.

doi:10.1007/s00703-016-0441-5

Cited by 8 publications

(5 citation statements)

References 42 publications

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“…This study discusses the formation of the ECP and the mechanism by which it triggers the inner rainbands, using numerical simulations of idealized TCs with the CM1 model. There is a clear cold pool just outside the eyewall at low levels, which has been found in some previous numerical studies (Akter & Tsuboki, ; Chen et al, ; Ma et al, ; Moon & Nolan, ; Sawada & Iwasaki, ; Williams, ). The ECP is related to the TC intensity.…”

Section: Discussionsupporting

confidence: 75%

“…For the formation of rainbands in the inner core, some studies proposed that inertial-gravity waves were important (Tang et al, 2018;Willoughby, 1977), while others thought that vortex Rossby waves (VRWs) were important for inner rainband (Chen & Yau, 2001;Wang, 2002aWang, , 2002b. A cold pool just outside the eyewall was also found in some simulations of idealized (Ma et al, 2015;Sawada & Iwasaki, 2010b;Williams, 2016) and real cases (Akter & Tsuboki, 2012;Chen et al, 2014;Moon & Nolan, 2015a). However, the characteristics of cold pools due to the precipitation from the eyewall just outside the eyewall and their relationship with the inner rainbands have not yet been documented in detail.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Eyewall Cold Pool on the Inner Rainband of a Tropical Cyclone

Cai

Tang

2019

JGR Atmospheres

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The low‐level cold pool just under a tropical cyclone eyewall and its effect on the formation of inner rainbands are studied, through idealized convection‐permitting simulations. Analysis of the potential temperature budget indicates that the formation of the eyewall cold pool (ECP) results from the evaporation of eyewall rainfall. The ECP is a barrier to boundary layer inflow, which results in clear convergence and vertical updraft at its outer edge. A budget analysis of the vertical motion tendency also indicates that the sum of the buoyancy and vertical pressure gradient terms makes a large contribution to the vertical updraft at the outer edge of the ECP. This then promotes the formation of convection cells and an inner rainband. Two sensitivity experiments further verify that the intensity of the ECP‐triggered inner rainbands is positively correlated with the magnitude of the radial gradient of potential temperature at the outer edge of the ECP.

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Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Effect of the Eyewall Cold Pool on the Inner Rainband of a Tropical Cyclone

Cai

Tang

2019

JGR Atmospheres

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“…Some of the modelling studies have highlighted the sensitivity of NWP models to the ABL parametrization schemes in predicting the intensity and structure of a TC (Rao and Prasad 2007;Bhaskar Rao et al 2009;Kepert 2012;Kumari et al 2019). Based on several theoretical and experimental studies, it is now a well-established fact that the MABL plays a pivotal role in the regulation of the dynamical and convective processes which are responsible for the strengthening of the inflow of a matured TC (Smith and Thomsen 2010;Williams 2016). Therefore, it is imperative to investigate the impact of a TC on the MABL.…”

Section: Discussionmentioning

confidence: 99%

Impact of a very severe cyclonic storm ‘OCKHI’ on the vertical structure of marine atmospheric boundary layer over the Arabian Sea

Subrahamanyam

Roshny

Paul

et al. 2020

Bull. of Atmos. Sci.& Technol.

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Although considerable progress has been made in improving the early predictability of the tropical cyclones, our knowledge of the vertical structure of the marine atmospheric boundary layer (MABL) over a cyclone-affected ocean remains limited. Here, we investigate the impact of a very severe cyclonic storm 'OCKHI' on the MABL parameters over the Arabian Sea by using a regional numerical weather prediction model, namely Consortium for Small-scale Modelling (COSMO). Time-series meteograms of the surface-layer and upper-air meteorological parameters are examined for six distinct locations on the trajectory of OCKHI. Equivalent day analysis on the surface-layer turbulent fluxes over these locations reveals a substantial rise in the magnitude of sensible and latent heat fluxes during the passage of the storm. Surface-layer parameters within the MABL exhibit large diurnal variability during the passage of the storm compared with the normal days. Profiles of thermodynamic parameters indicate a significant dip in the mixed layer heights near the eye of the storm due to the formation of deep convective precipitating clouds. A decline in the mixed layer height during the propagation of the storm was a persistent feature. The present study also provides a conserved variable analysis of the equivalent potential temperature (θ e ) and specific humidity (q) for a diagnostic investigation on the MABL processes and the movement of an air parcel. Keywords Air-sea interface fluxes • Conserved variable analysis • COSMO • Equivalent potential temperature • Marine atmospheric boundary layer • OCKHI • Tropical cyclones Bala Subrahamanyam D.

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“…TCs are formed over the tropical and subtropical waters of different cyclogenic basins: North Atlantic, Central and East Pacific, North-Western and South Pacific Ocean, North Indian Ocean (NIO), and South Indian Ocean (SIO). The warm waters of the oceans provide the energy source for TCs, and their intensification is led by the enhanced latent and sensible heat fluxes due to the evaporation and heat transfer from the surface of the warm oceans, moistening the TC boundary layer (Williams 2016).…”

Section: Introductionmentioning

confidence: 99%

Moisture source identification for precipitation associated with tropical cyclone development over the Indian Ocean: a Lagrangian approach

et al. 2022

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In this study, we investigated the moisture sources for precipitation through a Lagrangian approach during the genesis, intensification, and dissipation phases of all tropical cyclones (TCs) that occurred over the two hemispheric sub-basins of the Indian Ocean (IO) from 1980 to 2018. In the North IO (NIO), TCs formed and reached their maximum intensity on both sides of the Indian Peninsula, to the east in the Bay of Bengal (BoB), and to the west in the Arabian Sea (AS). The oceanic areas where TCs occurred were their main moisture sources for precipitation associated with TCs. Additionally, for TCs over the BoB, continental sources from the Ganges River basin and the South China Sea also played a notable role; for TCs over the AS, the Somali Low-Level jet (along the African coast in a northerly direction) also acted as an essential moisture transport. In the South IO (SIO), the western, central, and eastern basins were identified as the preferred areas for the genesis and development of TCs. During TC activity, the central IO and the Wharton and Perth basins mostly supplied atmospheric moisture. The Mascarene High circulation was the main moisture transport mechanism for the precipitation of TCs formed in the SIO basin. In both basins, during their intensification process, TCs gained more moisture (even more intensely when reaching the hurricane category) than during the genesis or dissipation stages. Additionally, the modulation during monsoonal seasons of the moisture contribution to the TCs was more noticeable over the NIO basin than for the SIO. Overall, the moisture uptake for precipitation from the sources for TCs occurred slightly faster in the NIO basin than in the SIO basin.

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The inner core thermodynamics of the tropical cyclone boundary layer

Cited by 8 publications

References 42 publications

Effect of the Eyewall Cold Pool on the Inner Rainband of a Tropical Cyclone

Effect of the Eyewall Cold Pool on the Inner Rainband of a Tropical Cyclone

Impact of a very severe cyclonic storm ‘OCKHI’ on the vertical structure of marine atmospheric boundary layer over the Arabian Sea

Moisture source identification for precipitation associated with tropical cyclone development over the Indian Ocean: a Lagrangian approach

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