Rossby-Haurwitz wave perturbations under tropical forcing

Pérez‐García, Ismael

doi:10.1016/s0187-6236(14)71113-0

Cited by 3 publications

(6 citation statements)

References 42 publications

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“…(1) captures many features of the large scale dynamics of the barotropic Earth's atmosphere, providing better understanding of the low-frequency variability, teleconnection patterns and the synoptic blocking events [11][12][13][14][15]. A mechanism that generates low-frequency variability is the instability of non-zonal basic flow as proposed by Simmons et al [11].…”

Section: In Latitudes Between −50mentioning

confidence: 99%

“…The effect of the mean flow, given by a linear combination Legendre polynomials and a Rossby-Haurwitz wave, was provied by Refs. [15,27]. The zonal basic flow, demonstrated in Figure 2, can be approximated by the following, …”

Section: In Latitudes Between −50mentioning

confidence: 99%

“…Observational evidence indicates that the zonal flow pattern on the Earth can be approximately represented by a linear combination of seven Legendre polynomials of odd parity [15,30]. The zonal flow has the maximum westerly of 33m=sa t3 5 North and South, and an easterly wind of 5m=s at the equator.…”

Section: In Latitudes Between −50mentioning

confidence: 99%

“…This zonal wind field resembles the upper troposphere during the northern winter. The stability analysis showed that unstable perturbations are observed in the neighbourhood of subtropical jets, and the dominant zonal wave number of the modes are m ¼ 7 and m ¼ 5 (see Figure 3 of [15]). …”

Section: In Latitudes Between −50mentioning

confidence: 99%

“…Simmons et al [11] showed that barotropic instability can be responsible for a low-frequency variability of Earth's atmosphere, and Perez-Garcia [15] demonstrated that unstable perturbations are observed in the neighbourhood of subtropical jets on the Earth. Then an analytic dipole vortex may be constructed on the Venus Polar Regions.…”

Section: As Shown Inmentioning

confidence: 99%

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Interaction of Tropical Cyclones with a Dipole Vortex

Pérez‐García¹,

Aguilar‐Sierra²,

Hernandez³

2017

Vortex Structures in Fluid Dynamic Problems

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The purpose of this chapter is to discuss certain disturbances around the pole of a Venus-type planet that result as a response to barotropic instability processes in a zonal flow. We discuss a linear instability of normal modes in a zonal flow through the barotropic vorticity equations (BVEs). By using a simple idealization of a zonal flow, the instability is employed on measurements of the upper atmosphere of Venus. In 1998, the tropical cyclone Mitch gave way to the observational study of a dipole vortex. This dipole vortex might have helped to intensify the cyclone and moved it towards the SW. In order to examine this process of interaction, the nonlinear BVE was integrated in time applied to the 800-200 hPa average layer in the previous moment when it moved towards the SW. The 2-day integrations carried out with the model showed that the geometric structure of the solution can be calculated to a good approximation. The solution HLC moves very fast westwards as observed. On October 27, the HLA headed north-eastward and then became quasi-stationary. It was also observed that HLA and HLC as a coupled system rotates in the clockwise direction.

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Section: In Latitudes Between −50mentioning

confidence: 99%

Section: In Latitudes Between −50mentioning

confidence: 99%

Section: In Latitudes Between −50mentioning

confidence: 99%

Section: In Latitudes Between −50mentioning

confidence: 99%

Section: As Shown Inmentioning

confidence: 99%

See 3 more Smart Citations

Interaction of Tropical Cyclones with a Dipole Vortex

Pérez‐García¹,

Aguilar‐Sierra²,

Hernandez³

2017

Vortex Structures in Fluid Dynamic Problems

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Exact solutions of the vorticity equation on the sphere as a manifold

Pérez‐García

2015

Atm

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RESUMENEl propósito de este trabajo es representar las soluciones exactas de la ecuación de vorticidad barotrópica sobre la esfera unitaria S 2 en rotación soluciones generalizadas llamadas modones. Se relacionan los métodos modernos de la teoría de funciones correcta, se esclarece la noción abstracta de mapa local, cambio de mapa y atlas. Uno de los objetivos de este trabajo es entender mejor la solución de la ecuación de vorticidad barotrópica sobre la variedad S 2 y su S 2 , g). Por lo tanto, estará disponible un tipo más general de espacio que también puede contener información geométrica y analítica sustancial sobre las soluciones a la ecuación de vorticidad barotrópica. ABSTRACTThe purpose of this paper is to represent the exact solutions of the barotropic vorticity equations (BVE) on the rotating unit sphere S 2 -ferentiable manifold. When the differentiable manifold S 2 is well understood, the abstract notion of local chart, change of chart, and atlases becomes evident. One of the aims of this paper is to better understand the solution of the barotropic vorticity equation on the manifold S 2 and its usefulness to identify the properties of the solutions on the Riemannian manifold (S 2 , g). Therefore, a more general type of space will be available, which can also contain substantial geometric and analytic information about solutions for the barotropic vorticity equation.

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