Relevant bibliographies by topics / Cyclones Rossby waves

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  2. Dissertations / Theses
  3. Reports

Academic literature on the topic 'Cyclones Rossby waves'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Cyclones Rossby waves"

1

Schreck, Carl J., John Molinari, and Karen I. Mohr. "Attributing Tropical Cyclogenesis to Equatorial Waves in the Western North Pacific." Journal of the Atmospheric Sciences 68, no. 2 (2011): 195–209. http://dx.doi.org/10.1175/2010jas3396.1.

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Abstract Tropical cyclogenesis is attributed to an equatorial wave when the filtered rainfall anomaly exceeds a threshold value at the genesis location. It is argued that 0 mm day−1 (simply requiring a positive anomaly) is too small a threshold because unrelated noise can produce a positive anomaly. A threshold of 6 mm day−1 is too large because two-thirds of storms would have no precursor disturbance. Between these extremes, consistent results are found for a range of thresholds from 2 to 4 mm day−1. Roughly twice as many tropical cyclones are attributed to tropical depression (TD)-type distu
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Molinari, John, Kelly Lombardo, and David Vollaro. "Tropical Cyclogenesis within an Equatorial Rossby Wave Packet." Journal of the Atmospheric Sciences 64, no. 4 (2007): 1301–17. http://dx.doi.org/10.1175/jas3902.1.

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Abstract A packet of equatorial Rossby (ER) waves that lasted 2.5 months is identified in the lower troposphere of the northwest Pacific. Waves within the packet had a period of 22 days, a wavelength of 3600 km, a westward phase speed of 1.9 m s−1, and a near-zero group speed. The wave properties followed the ER wave dispersion relation with an equivalent depth near 25 m. The packet was associated with the development of at least 8 of the 13 tropical cyclones that formed during the period. A composite was constructed around the genesis locations. Tropical cyclones formed east of the center of
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Krouse, Kyle D., Adam H. Sobel, and Lorenzo M. Polvani. "On the Wavelength of the Rossby Waves Radiated by Tropical Cyclones." Journal of the Atmospheric Sciences 65, no. 2 (2008): 644–54. http://dx.doi.org/10.1175/2007jas2402.1.

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Abstract The authors present a theory for the zonal wavelength of tropical depression–type disturbances, which occur as a result of Rossby wave radiation from a preexisting tropical cyclone (TC). In some cases, such disturbances undergo tropical cyclogenesis, resulting in a pair of tropical cyclones; the theory then predicts the zonal separation distance of such tropical cyclone pairs. Numerical experiments are presented in which a thermally forced vortex, superimposed on an initial state of rest, is moved at different velocities in a shallow-water model on a sphere. Vortices moving westward g
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Schreck, Carl J., John Molinari, and Anantha Aiyyer. "A Global View of Equatorial Waves and Tropical Cyclogenesis." Monthly Weather Review 140, no. 3 (2012): 774–88. http://dx.doi.org/10.1175/mwr-d-11-00110.1.

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Abstract This study investigates the number of tropical cyclone formations that can be attributed to the enhanced convection from equatorial waves within each basin. Tropical depression (TD)-type disturbances (i.e., easterly waves) were the primary tropical cyclone precursors over the Northern Hemisphere basins, particularly the eastern North Pacific and the Atlantic. In the Southern Hemisphere, however, the number of storms attributed to TD-type disturbances and equatorial Rossby waves were roughly equivalent. Equatorward of 20°N, tropical cyclones formed without any equatorial wave precursor
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McDONALD, N. ROBB. "The decay of cyclonic eddies by Rossby wave radiation." Journal of Fluid Mechanics 361 (April 25, 1998): 237–52. http://dx.doi.org/10.1017/s0022112098008696.

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It is argued that because shallow water cyclones on a β-plane drift westward at a speed equal to an available Rossby wave phase speed, they must radiate energy and cannot, therefore, be steady. The form of the Rossby wave wake accompanying a quasi-steady cyclone is calculated and the energy flux in the radiated waves determined. Further, an explicit expression for the radiation-induced northward drift of the cyclone is obtained. A general method for determining the effects of the radiation on the radius and amplitude of the vortex based on conservation of energy and potential vorticity is give
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Binder, Hanin, Maxi Boettcher, Hanna Joos, and Heini Wernli. "The Role of Warm Conveyor Belts for the Intensification of Extratropical Cyclones in Northern Hemisphere Winter." Journal of the Atmospheric Sciences 73, no. 10 (2016): 3997–4020. http://dx.doi.org/10.1175/jas-d-15-0302.1.

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Abstract The role of warm conveyor belts (WCBs) and their associated positive low-level potential vorticity (PV) anomalies are investigated for extratropical cyclones in Northern Hemisphere winter, using ERA-Interim and composite techniques. The Spearman correlation coefficient of 0.68 implies a moderate to strong correlation between cyclone intensification and WCB strength. Hereby, cyclone intensification is quantified by the normalized maximum 24-h central sea level pressure deepening and WCB strength by the WCB air mass associated with the cyclone’s 24-h period of strongest deepening. Explo
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Brannan, Allison Lynn, and Jeffrey M. Chagnon. "A Climatology of the Extratropical Flow Response to Recurving Atlantic Tropical Cyclones." Monthly Weather Review 148, no. 2 (2020): 541–58. http://dx.doi.org/10.1175/mwr-d-19-0216.1.

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Abstract Previous case studies have noted a significant extratropical flow response to recurving Atlantic tropical cyclones (TCs), which is often linked to extreme weather events downstream. This study examines the modification of Rossby waves on the extratropical jet in response to recurving Atlantic TCs from a climatological perspective. Changes in amplitude and location of Rossby waves are identified using a wavelet decomposition technique on isentropic potential vorticity. The climatology demonstrates that recurving Atlantic TC events are capable of modifying the amplitude of the extratrop
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Nycander, J. "The difference between monopole vortices in planetary flows and laboratory experiments." Journal of Fluid Mechanics 254 (September 1993): 561–77. http://dx.doi.org/10.1017/s0022112093002253.

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This work is an attempt to explain observations of vortices in experiments with shallow water in rotating paraboloidal vessels. The most long-lived vortices are invariably anticyclones, while cyclones quickly disperse, and they are larger than the Rossby radius. These experiments are designed to simulate geophysical flows, where large, long-lived, anticyclonic vortices are common.The general condition for vortices to be steady is that they propagate faster than linear Rossby waves, so that the vortex energy is not dispersed by coupling to linear waves. The propagation velocity is determined by
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Zhong, Wei, Da-Lin Zhang, and Han-Cheng Lu. "A Theory for Mixed Vortex Rossby–Gravity Waves in Tropical Cyclones." Journal of the Atmospheric Sciences 66, no. 11 (2009): 3366–81. http://dx.doi.org/10.1175/2009jas3060.1.

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Abstract Vortex–Rossby waves (VRWs) and inertial gravity waves (IGWs) have been proposed to explain the propagation of spiral rainbands and the development of dynamical instability in tropical cyclones (TCs). In this study, a theory for mixed vortex–Rossby–inertia–gravity waves (VRIGWs), together with VRWs and IGWs, is developed by including both rotational and divergent flows in a shallow-water equations model. A cloud-resolving TC simulation is used to help simplify the radial structure equation for linearized perturbations and then transform it to a Bessel equation with constant coefficient
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Cotto, Amaryllis, Israel Gonzalez, and Hugh E. Willoughby. "Synthesis of Vortex Rossby Waves. Part I: Episodically Forced Waves in the Inner Waveguide." Journal of the Atmospheric Sciences 72, no. 10 (2015): 3940–57. http://dx.doi.org/10.1175/jas-d-15-0004.1.

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Abstract Spiral cloud bands dominate tropical cyclones’ appearance in satellite and radar images. It is generally accepted that at least some of them are vortex Rossby waves that propagate on the radial gradient of mean-flow-relative vorticity. This study models these features in Fourier and time domains as linear, barotropic, nondivergent waves on a maintained mean vortex scaled to resemble tropical cyclones. This formulation is the simplest one imaginable that encompasses the essential rotational dynamics. The modeled waves are episodically forced by a rotating annular train of sinusoidal vo
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Dissertations / Theses on the topic "Cyclones Rossby waves"

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Delk, Tracey Lee. "Intraseasonal, large-scale circulations and tropical cylcome activity over the Western North Pacific during Boreal summer /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FDelk.pdf.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, June 2004.<br>Thesis advisor(s): Patrick Harr. Includes bibliographical references (p. 73-75). Also available online.
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Delk, Tracey Lee. "Intraseasonal, large-scale circulations and tropical cyclcone activity over the Western North Pacific during Boreal summer." Thesis, Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/1168.

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Approved for public release; distribution is unlimited.<br>Large-scale circulations in the 15-25 day period over the western North Pacific during northern summer were determined using the leading modes of a Singular Value Decomposition of 850 hPa winds and outgoing longwave radiation. Composites were constructed to define the wave patterns' structural characteristics. Their evolution is characterized by alternating cyclonic and anticyclonic equatorial anomalies that are linked to anomalous convective activity. Mid-latitude perturbations appear to contribute to the growth of new equatorial dist
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Cotto, Amaryllis. "Intermittently Forced Vortex Rossby Waves." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/553.

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Wavelike spiral asymmetries are an intriguing aspect of Tropical Cyclone dynamics. Previous work hypothesized that some of them are Vortex Rossby Waves propagating on the radial gradient of mean–flow relative vorticity. In the Intermittently Forced Vortex Rossby Wave theory, intermittent convection near the eyewall wind maximum excites them so that they propagate wave energy outward and converge angular momentum inward. The waves’ energy is absorbed as the perturbation vorticity becomes filamented near the outer critical radii where their Doppler–shifted frequencies and radial group velocities
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Gao, Cen. "Vortex Rossby Wave Propagation in Three Dimensional Tropical-Cyclone-Like Baroclinic Vortices." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2533.

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This study aims to advance our understanding of the inner-core dynamics of tropical cyclones (TCs) from the perspective of vortex Rossby waves (VRWs) through investigating wave kinematics, propagation feature, and wave-mean-flow interaction in three dimensional TC-like baroclinic vortices. Using the Wenzel-Kramers-Brillouin analysis in the asymmetric balanced model framework, the generalized wave dispersion relation, group velocities, and stagnation radius/height of VRW wave-packets in both pseudo-height and isentropic coordinates are derived. It is found that the VRW dispersion relation assoc
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5

Leroux, Marie-Dominique. "Intensification rapide des cyclones tropicaux du sud-ouest de l’océan Indien (SWIO) : dynamique interne et influences externes." Thesis, La Réunion, 2012. http://www.theses.fr/2012LARE0014/document.

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Dans un contexte international, la prévision d'intensité des cyclones tropicaux connaît encore de graves déficiences tandis que la prévision de trajectoire de ces phénomènes météorologiques extrêmes s'est grandement améliorée ces dernières décennies. Une source d'erreur pour la prévision d'intensité est le manque de connaissance des processus physiques qui régissent l'évolution de la structure et de l'intensité des cyclones. Cette thèse, proposée dans le cadre des responsabilités du Centre Météorologique Régional Spécialisé (CMRS) de la Réunion et des axes de recherche du LACy et du CNRM, a po
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Gonzalez, Israel. "Linear and Nonlinear Motion of a Barotropic Vortex." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1196.

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The linear Barotropic Non-Divergent simulation of a vortex on a beta plane is consistent with Willoughby’s earlier shallow-water divergent results in that it produced an unbounded accelerating westward and poleward motion without an asymptotic limit. However, Montgomery’s work which yielded finite linear drift speeds for his completely cyclonic vortex was inconsistent with ours. The nonlinearly-forced streamfunction exhibited a beta-gyre like structure, but with opposite polarity phase to the linear gyres. Utilization of the linear model with time-dependent, but otherwise beta-like, forcing re
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Reports on the topic "Cyclones Rossby waves"

1

Peng, Melinda S. Role of Vortex Rossby Waves on Tropical Cyclone Intensity. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada532809.

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Peng, Melinda S. Role of Vortex Rossby Waves on Tropical Cyclone Intensity. Defense Technical Information Center, 2007. http://dx.doi.org/10.21236/ada541436.

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Peng, Melinda S. Role of Vortex Rossby Waves on Tropical Cyclone Intensity. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada631046.

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