Quadrupole modons on a sphere

Neven, Enrico

doi:10.1080/03091929208225242

Cited by 18 publications

(15 citation statements)

References 12 publications

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“…Hence, a very simple idealization of the structure of a north-south dipolar vortex would be the modon solution (Verkley, 1984) trapped near the equator, which is qualitatively similar to the dipole blocking pattern observed in the midlatitude atmosphere (Frederiksen, 1982). Tribbia (1984), Verkley (1984Verkley ( , 1987Verkley ( , 1990 and Neven (1992) constructed exact, highly nonlinear solutions of the BVE on the rotating unit sphere called modons. It is well known that there are wave-like modons, localized modons, and uniform modons that can arise as a result of local forcing (Neven, 2001).…”

Section: Gill-matsuno Waves or Modons In The Tropical Regionmentioning

confidence: 99%

Connections in the development of tropical cyclone Mitch (1998): A tribute to the human loss in this calamity

Pérez‐García

Aguilar‐Sierra

Hernández-Alfaro

2018

Atm

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Section: Gill-matsuno Waves or Modons In The Tropical Regionmentioning

confidence: 99%

Connections in the development of tropical cyclone Mitch (1998): A tribute to the human loss in this calamity

Pérez‐García

Aguilar‐Sierra

Hernández-Alfaro

2018

Atm

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“…A mechanism that generates low-frequency variability is the instability of non-zonal basic flow as proposed by Simmons et al [11]. The four classes of BVE (for ideal flow) solutions known by now are the simple zonal flowsΨ ðμÞ and more complicated flows called Rossby-Haurwitz (RH) waves, Wu-Verkley waves [16] and modons [17][18][19][20][21].…”

Section: In Latitudes Between −50mentioning

confidence: 99%

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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“…There are four widely-accepted solutions of BVE (for the ideal flow): the simple zonal flows Ψ(μ), more complicated flows called RH waves, the Wu-Verkley (WV) wave (Wu and Verkley, 1993) and modons (Tribbia, 1984;Verkley, 1984Verkley, , 1987Verkley, , 1990Neven, 1992). RH waves are very useful for interpreting the large-scale wave structures in the atmospheric circulation of midlatitudes.…”

Section: Barotropic Vorticity Equation and Linear Instability On A Spmentioning

confidence: 99%

Trend of total column ozone over Mexico from TOMS and OMI data (1978-2013)

et al. 2014

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Este trabajo explora el flujo zonal en forma de polinomios de Legendre. El flujo básico se divide en un flujo zonal simétrico y una onda de Rossby-Haurwitz (RH). Varias características (más realistas) de este flujo zonal lo hacen particularmente interesante, como las corrientes en chorro con dirección oeste en latitudes medias y un viento con dirección del este alrededor del ecuador, muy similar al flujo medio horizontal del periodo diciembre-enero a 200 mb. El flujo zonal se combina con la onda RH para evaluar las etapas tempranas del mecanismo de acciones de bloqueo en el Pacífico nororiental. Se llevó a cabo una simulación numérica utilizando un modelo barotrópico lineal con forzamiento tropical y disipación para analizar la respuesta extratropical del mecanismo de reforzamiento de torbellinos en los sistemas de alta presión a lo largo de la costa occidental de Norteamérica. ABSTRACTThis study explores the zonal flow in the form of Legendre polynomials. The basic flow is divided into a zonally symmetric flow and a Rossby-Haurwitz (RH) wave. Several features of this (more realistic) zonal flow make it particularly interesting, such as the midlatitude westerly jet streams and an easterly wind around the equator, which closely resembles the mean horizontal flow at 200 mb of the December-February period. The zonal flow is combined with the RH wave, in order to test the blocking formation mechanism on early stages for the northeastern Pacific. A numerical simulation has been performed using a linear barotropic model with tropical forcing and damping to check the extra-tropical response of the mechanism of eddies reinforcement of the ridge along the western coast of North America.

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Quadrupole modons on a sphere

Cited by 18 publications

References 12 publications

Connections in the development of tropical cyclone Mitch (1998): A tribute to the human loss in this calamity

Connections in the development of tropical cyclone Mitch (1998): A tribute to the human loss in this calamity

Interaction of Tropical Cyclones with a Dipole Vortex

Trend of total column ozone over Mexico from TOMS and OMI data (1978-2013)

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