The Relationship between Tropical Cyclone Motion and Environmental Geostrophic Flows

Dong, Keqin; Neumann, Charles J.

doi:10.1175/1520-0493(1986)114<0115:trbtcm>2.0.co;2

Cited by 73 publications

(46 citation statements)

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“…Such a steering concept has been extended to include the beta drift (also called secondary steering) that arises mainly from the interaction between tropical cyclone circulation and the planetary vorticity gradient (Holland, 1983;Chan, 1984;Chan and Williams, 1987;Fiorino and Elsberry, 1989;Carr and Elsberry, 1990;Wang and Li, 1992;Wang and Holland, 1996a). The steering flow is usually calculated over a certain radius from the tropical cyclone center in the horizontal and a deep pressure layer in the vertical (Dong and Neumann, 1986;Velden and Leslie, 1991;Franklin et al, 1996). For convenience, here we call it the conventional steering flow.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the steering principal of tropical cyclone motion in a numerical experiment

Chen

2016

Atmos. Chem. Phys.

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Abstract. The steering principle of tropical cyclone motion has been applied to tropical cyclone forecasting and research for nearly 100 years. Two fundamental questions remain unanswered. One is why the steering flow plays a dominant role in tropical cyclone motion, and the other is when tropical cyclone motion deviates considerably from the steering. A high-resolution numerical experiment was conducted with the tropical cyclone in a typical large-scale monsoon trough over the western North Pacific. The simulated tropical cyclone experiences two eyewall replacement processes.Based on the potential vorticity tendency (PVT) diagnostics, this study demonstrates that the conventional steering, which is calculated over a certain radius from the tropical cyclone center in the horizontal and a deep pressure layer in the vertical, plays a dominant role in tropical cyclone motion since the contributions from other processes are largely cancelled out due to the coherent structure of tropical cyclone circulation. Resulting from the asymmetric dynamics of the tropical cyclone inner core, the trochoidal motion around the mean tropical cyclone track cannot be accounted for by the conventional steering. The instantaneous tropical cyclone motion can considerably deviate from the conventional steering that approximately accounts for the combined effect of the contribution of the advection of the symmetric potential vorticity component by the asymmetric flow and the contribution from the advection of the wave-number-one potential vorticity component by the symmetric flow.

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Section: Introductionmentioning

confidence: 99%

Revisiting the steering principal of tropical cyclone motion in a numerical experiment

Chen

2016

Atmos. Chem. Phys.

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“…George and Gray (1976) suggested that the flow near 700 hPa or the averaged flow in the 700-500 hPa layer is the best representation of the environmental steering flow in the tropics, while Holland (1984) suggested the use of the vertical mean steering flow between 850 and 300 hPa. Some others suggested the use of a deep layer mean from 1000 to 150 or 100 hPa to approximate a TC's vortex (Sanders et al 1980;Dong and Neumann 1986;Franklin 1990;Velden and Leslie 1991). Recently, Galarneau and Davis (2013) defined an optimal environmental steering flow with variable vertical extent.…”

Section: Decomposition Methodologymentioning

confidence: 99%

Reexamining the Binary Interaction of Four Pairs of Tropical Cyclones in the Northwest Pacific

Qian

Huang

Zhang

2016

Journal of the Meteorological Society of Japan

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Four pairs of tropical cyclones (TCs) in the vicinity of the Northwest (NW) Pacific have been restudied in this paper by decomposing a total flow into a climatic component and an anomaly as well as by a simple generalized beta-advection model (GBAM). These results contradict with previous reports that binary interactions occurred in the four pairs of TCs. The intensities of the TC pairs were not well matched to each other during their common lifetime period; thus, the result of GBAM revealed that the strong TC had a direct influence on the track of the weak TC, but the reverse was not true. All dynamical models for studying the binary interaction of two adjacent TCs depend on how to separate the TC vortex and surrounding flow from the total flow. In this paper, the anomalous component can be directly used to measure the intensities and sizes of TCs and other adjacent disturbances. The track of TC as an anomalous vortex is influenced by the climatic steering flow and interacts with other anomalous systems in the vicinity. Whether a binary interaction happens between two TCs and whether the two TCs interact with other anomalous systems can be determined by the GBAM at the optimal level near the maximum center of the vorticity anomaly.

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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: 96%

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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The Relationship between Tropical Cyclone Motion and Environmental Geostrophic Flows

Cited by 73 publications

References 0 publications

Revisiting the steering principal of tropical cyclone motion in a numerical experiment

Revisiting the steering principal of tropical cyclone motion in a numerical experiment

Reexamining the Binary Interaction of Four Pairs of Tropical Cyclones in the Northwest Pacific

Tropical cyclone track forecasting techniques ― A review

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