Cyclogenesis by a Purely Mechanical Process

Abdullah, Abdul Jabbar

doi:10.1175/1520-0469(1949)006<0086:cbapmp>2.0.co;2

Cited by 17 publications

(10 citation statements)

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“…This mechanism for new cell development does not require a cold pool and may operate at a distance from the current storm. Abdullah [1949] and Tepper [1950] hypothesized that bores at lower levels may result from the cold pool acting as a piston on the boundary layer air (topped by a stable layer) ahead of the cold pool. Nicholls et al [1991] and Mapes [1993], however, determined that a spectrum of bores emanates from an MCS as a result of the entire vertical profile of mass divergence (or vertical gradient of latent heat release) associated with an MCS.…”

Section: Modes Of Mcs Propagationmentioning

confidence: 99%

Mesoscale convective systems

Houze

2004

Reviews of Geophysics

1,130

1,111

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[1] Mesoscale convective systems (MCSs) have regions of both convective and stratiform precipitation, and they develop mesoscale circulations as they mature. The upward motion takes the form of a deep-layer ascent drawn into the MCS in response to the latent heating and cooling in the convective region. The ascending layer overturns as it rises but overall retains a coherent layer structure. A middle level layer of inflow enters the stratiform region of the MCS from a direction determined by the large-scale flow and descends in response to diabatic cooling at middle-to-low levels. A middle level mesoscale convective vortex (MCV) develops in the stratiform region, prolongs the MCS, and may contribute to tropical cyclone development. The propagation of an MCS may have a discrete component but may further be influenced by waves and disturbances generated both in response to the MCS and external to the MCS. Waves of a larger scale may affect the propagation velocity by phase locking with the MCS in a cooperative mode. The horizontal scale of an MCS may be limited either by a balance between the formation rate of convective precipitation and dissipation of stratiform precipitation or by the Rossby radius of the MCV. The vertical redistribution of momentum by an MCS depends on the size of the stratiform region, while the net vertical profile of heating of the largescale environment depends on the amount of stratiform rain. Regional variability of the stratiform rain from MCSs affects the large-scale circulation's response to MCS heating.

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Section: Modes Of Mcs Propagationmentioning

confidence: 99%

Mesoscale convective systems

Houze

2004

Reviews of Geophysics

1,130

1,111

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“…The possibility of existence of a solitary wave in the atmosphere as we are interested in was suggested by Abdullah (1949). Christie et al (1978) believed the morning glory to be a kind of atmospheric solitary wave which can be described dynamically by solutions to the Korteweg-de Vries (KdV) equation (Korteweg and de Vries, 1895).…”

Section: Introductionmentioning

confidence: 99%

A solitary wave packet in the atmosphere observed from space

Zheng

Yan

Liu

et al. 1998

Geophysical Research Letters

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“…The present writer [1] has expressed the conjecture that solitary waves, of similar nature as described in the previous paragraphs, may exist in the atmosphere. A single elevation in the upper surface of a layer of inversion may be created and may travel for a considerable distance along that surface, showing the general appearance of a small migratory high to an observer located on the ground.…”

mentioning

confidence: 67%

“…The present writer wishes to express the belief that these "bubbles" are actually the "atmospheric solitary waves" which were suggested in his paper of 1949 [1]. The present paper is an attempt to describe these disturbances, to suggest a possible way of their formation, and to show how they may lead to the creation of some convective activity which may even lead to the creation of tornadoes.…”

mentioning

confidence: 85%