The Importance of Horizontal Rolls in the Rapid Intensification of Tropical Cyclones

Sukhanovskii, A.; Попова, Е. Н.

doi:10.1007/s10546-020-00503-2

Cited by 9 publications

(3 citation statements)

References 55 publications

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“…Results from large eddy simulation (LES) are consistent with these observations (Zhu, 2008;. A laboratory study found that horizontal rolls could even impact the intensification rate of TCs (Sukhanovskii and Popova, 2020). Therefore, the omission of RVs in the PBL scheme could potentially lead to relatively poor TC intensity forecasts (Ernst et al, 2019).…”

Section: Introductionmentioning

confidence: 72%

A modified vertical eddy diffusivity parameterization in the HWRF model based on large eddy simulations and its impact on the prediction of two landfalling hurricanes

Li,

Pu,

Zhang

et al. 2023

Front. Earth Sci.

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Vertical eddy diffusivity (VED) in the planetary boundary layer (PBL) has a significant impact on forecasts of tropical cyclone (TC) structure and intensity. VED uncertainties in PBL parameterizations can be partly attributed to the model’s inability to represent roll vortices (RV). In this study, RV effects on turbulent fluxes derived from a large eddy simulation (LES) by Li et al. (Geophys. Res. Lett., 2021, 48, e2020GL090703) are added to the VED parameterization of the PBL scheme within the operational Hurricane Weather Research and Forecasting (HWRF) model. RV contribution to VED is parameterized through a coefficient and varies with the RV intensity and velocity scale. A modification over land has also been implemented. This modified VED parameterization is compared with the original wind-speed-dependent VED scheme in HWRF. Retrospective HWRF forecasts of Hurricanes Florence (2018) and Laura (2020) are analyzed to evaluate the impacts of the modified VED scheme on landfalling hurricane forecasts. Results show that the modified PBL scheme with the RV effect leads to an improvement in 10-m maximum wind speed forecasts of 14%–31%, with a neutral to positive improvement for track forecasts. Improved wind structure and precipitation forecasts against observations are also noted with the modified PBL scheme. Further diagnoses indicate that the revised PBL scheme enhances moist entropy in the boundary layer over land, leading to improved TC intensity prediction compared to the original scheme.

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Section: Introductionmentioning

confidence: 72%

A modified vertical eddy diffusivity parameterization in the HWRF model based on large eddy simulations and its impact on the prediction of two landfalling hurricanes

Li,

Pu,

Zhang

et al. 2023

Front. Earth Sci.

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“…In Rayleigh-Bénard convection the boundary conditions are defined using a constant temperature difference or heat flux. In the present configuration, that is often considered for laboratory modeling of geophysical flows [28][29][30][31][32] , the measurements of Nusselt number are more complex due to open surface of the fluid. Because of that the temperature at the top boundary depends on ambient conditions and it is unclear how q c should be evaluated.…”

Section: Methodsmentioning

confidence: 99%

Dependence of boundary layer thickness on layer height in laminar and transient convective regimes

Sukhanovskii,

Evgrafova

2020

Preprint

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Dependence of boundary layer thickness on layer height in laminar and transient regimes is studied for convection from localized heat source with an open surface. The measurements of Nusselt number and characteristic frequency of thermal plume formation are done for a wide range of Rayleigh number, different Prandtl numbers and different aspect ratios. The obtained results prove that for the developed (but not turbulent) convective flow the boundary layer thickness is almost independent of the layer height and it is mainly defined by applied temperature difference and physical properties of the fluid.

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“…In other versions, parts of the upper and lower boundaries are heated with different temperatures or the sidewalls of the tank considered are kept at different fixed temperatures. Other experiments just highlight the rotation and focus, e.g., on the formation of boundary currents [5] or the initiation and development of severe cyclones [6,7].…”

Section: Introductionmentioning

confidence: 99%

New Laboratory Experiments to Study the Large-Scale Circulation and Climate Dynamics

et al. 2023

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The large-scale flows of the oceans and the atmosphere are driven by a non-uniform surface heating over latitude, and rotation. For many years scientists try to understand these flows by doing laboratory experiments. In the present paper we discuss two rather new laboratory experiments designed to study certain aspects of the atmospheric circulation. One of the experiments, the differentially heated rotating annulus at the Brandenburg University of Technology (BTU) Cottbus, has a cooled inner cylinder and a heated outer wall. However, the structure of the atmospheric meridional circulation motivates a variation of this “classical” design. In the second experiment described, operational at the Institute of Continuous Media Mechanics (ICMM) in Perm, heating and cooling is performed at different vertical levels that resembles more the atmospheric situation. Recent results of both experiments are presented and discussed. Differences and consistencies are highlighted. Though many issues are still open we conclude that both setups have their merits. The variation with heating and cooling at different levels might be more suited to study processes in the transition zone between pure rotating convection and the zone of westerly winds. On the other hand, the simpler boundary conditions of the BTU experiment make this experiment easier to control.

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The Importance of Horizontal Rolls in the Rapid Intensification of Tropical Cyclones

Cited by 9 publications

References 55 publications

A modified vertical eddy diffusivity parameterization in the HWRF model based on large eddy simulations and its impact on the prediction of two landfalling hurricanes

A modified vertical eddy diffusivity parameterization in the HWRF model based on large eddy simulations and its impact on the prediction of two landfalling hurricanes

Dependence of boundary layer thickness on layer height in laminar and transient convective regimes

New Laboratory Experiments to Study the Large-Scale Circulation and Climate Dynamics

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