The Beta Drift of Baroclinic Vortices. Part II: Diabatic Vortices

Wang, Yuqing; Holland, Gregory

doi:10.1175/1520-0469(1996)053<3737:tbdobv>2.0.co;2

Cited by 63 publications

(36 citation statements)

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“…By contrast, corresponding uniform-flow experiments tend to produce more symmetric rainfall pattern (not shown), suggesting that the ambient vertical shear is responsible for the asymmetric convective heating. Previous modeling studies with convective heating (Wang and Holland 1996a;Bender 1997), and observational studies (Franklin et al 1993;Corbosiero and Molinari 2002;Black et al 2002) also suggest that convective asymmetries in tropical cyclones are closely related to vertical wind shear. Frank and Ritchie (2001) speculated that differential vorticity advection with height caused by the shear could be the mechanism responsible for the asymmetry.…”

Section: Simulated Tracksmentioning

confidence: 87%

“…Previous observational studies (Franklin et al 1988;Shimazu 1997;Corbosiero and Moli-nari 2002), and numerical ones (Wang and Holland 1996a;Bender 1997;Frank and Ritchie 2001), show that asymmetric convection with respect to the storm center frequently dominates even in the core area. However, there is no consensus about the role of convective asymmetries in tropical cyclones.…”

Section: Introductionmentioning

confidence: 91%

“…The time scale of the TC motions is another important factor to be considered in such a comparison of steering flow and TC motion. Observational and modeling studies (e.g., Franklin et al 1993;Wang and Holland 1996b) suggest that the flows within the inner-core region seem to be much more related to transient or oscillatory TC motions, rather than the long-term ones. To summarize, lack of quantitative analysis hinders us from clarifying the relative contribution of convective heating, versus steering flow to TC motion.…”

Section: Introductionmentioning

confidence: 99%

“…A range of cumulus parameterization schemes are used in the present study, to see how the result varies with the schemes, since one of our final goals is to improve the convective process in the numerical prediction models towards better track forecasting, as well as better understanding of TC motion mechanism. An increasing number of numerical studies on the TC motion in vertically sheared environmental flow, have been conducted over the past few decades (e.g., Madala and Piacsek 1975;Shapiro 1992;Wu and Emanuel 1993;Flatau et al 1994;Wang and Holland 1996a;Wu and Wang 2001). As a result of such studies, understanding of the motion mechanism of baroclinic tropical cyclonelike vortices, has been advanced especially within the framework of adiabatic dynamics (e.g., Jones 1995).…”

Section: Introductionmentioning

confidence: 99%

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Steering Weight Concept and its Application to Tropical Cyclones Simulated in a Vertical Shear Experiment

Ueno

2003

Journal of the Meteorological Society of Japan

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A series of idealized numerical simulations of tropical cyclones is performed to enhance the knowledge on the mechanism of tropical cyclone (TC) motion in vertically sheared environments. The simulations are performed using an f -plane version of the typhoon track prediction model previously run at the Japan Meteorological Agency.A wide variety of TC tracks show up when the model is integrated repeatedly with different formulations of convective parameterization from an identical initial field. To account for the diversity of TC motion in vertically sheared environment, a steering-weight concept is introduced. The steeringweight is a set of weighting factors, mathematically derived from the surface pressure tendency equation, and can be a measure of how sensitive the motion of a TC is, to the steering flow at each vertical level. The experiments with different cumulus parameterizations show that the vertical profile of steering weight tends to strongly depend on the cumulus parameterization scheme used, but much less on the environment specified. This result implies that the axisymmetric thermal structure of modeled TCs, is mostly determined by parameterization schemes rather than environment in the model. And the longterm (say, 72 h mean) TC motion is well explained by the combination of steering weight, and large-scale flow fields.The result suggests that the differences in TC track among numerical prediction models, may be attributable to the differences in steering weight to some degree, given that there is no significant difference in the simulated large-scale flow fields among the models. Moreover, as long as the steering weight concept holds in nature, the steering-weighted deep layer mean flow, instead of the conventional and empirical pressure-weighted one, would work better in accounting for the motion of real tropical cyclones.

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Section: Simulated Tracksmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Steering Weight Concept and its Application to Tropical Cyclones Simulated in a Vertical Shear Experiment

Ueno

2003

Journal of the Meteorological Society of Japan

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“…However, research during the past decade has shown that other forms of interaction between the cyclone and its environment can also have a noticeable impact on its motion, which means that the earlier simplistic view of steering currents may be inaccurate (Dong and Neumann, 1986;Fiorino and Elsberry, 1989;Wang and Holland, 1996a;Wang and Holland, 1996b;Wang and Holland, 1996c).…”

Section: Cyclone Forecasting Through Steering Airflow Determinationmentioning

confidence: 99%

Tropical cyclone track forecasting techniques ― A review

Roy

Kovordanyi

2012

Atmospheric Research

129

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Delivering accurate cyclone forecasts in time is of key importance when it comes to saving human lives and reducing economic loss. Difficulties arise because the geographical and climatological characteristics of the various cyclone formation basins are not similar, which entails that a single forecasting technique cannot yield reliable performance in all ocean basins. For this reason, global forecasting techniques need to be applied together with basin-specific techniques to increase the forecast accuracy. As cyclone track is governed by a range of factors variations in weather conditions, wind pressure, sea surface temperature, air temperature, ocean currents, and the earth' rotational force-the coriolis force, it is a formidable task to combine these parameters and produce reliable and accurate forecasts. In recent years, the availability of suitable data has increased and more advanced forecasting techniques have been developed, in addition to old techniques having been modified. In particular, artificial neural network based techniques are now being considered at meteorological offices. This new technique uses freely available satellite images as input, can be run on standard PCs, and can produce forecasts with good accuracy. For these reasons, artificial neural network based techniques seem especially suited for developing countries which have limited capacity to forecast cyclones and where human casualties are the highest.

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Tropical cyclone recurvature: An intrinsic property?

Chan

2016

Geophysical Research Letters

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The typical track of a tropical cyclone (TC) in the Northern Hemisphere is an initial northwestward movement followed by an eventual turning toward the east. Such turning is referred to as recurvature and often explained by the change of the environmental flow that steers the TC. Here we show that even in the absence of background flow, a TC initiated at a high enough latitude can recurve itself. Differential horizontal advection of the planetary vorticity by the TC circulation at different vertical levels leads to the development of vertical wind shear, upper tropospheric anticyclone, and asymmetric distribution of convection. The flow associated with the upper tropospheric anticyclone on the equatorward side of the TC and the diabatic heating associated with the asymmetric convection combine to cause the TC to recurve. Such knowledge, an intrinsic recurvature property of the TC is important in forecasting the TC track when the environmental flow is weak.

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The Beta Drift of Baroclinic Vortices. Part II: Diabatic Vortices

Cited by 63 publications

References 0 publications

Steering Weight Concept and its Application to Tropical Cyclones Simulated in a Vertical Shear Experiment

Steering Weight Concept and its Application to Tropical Cyclones Simulated in a Vertical Shear Experiment

Tropical cyclone track forecasting techniques ― A review

Tropical cyclone recurvature: An intrinsic property?

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