File:THE INFLUENCE OF BOUNDARY-LAYER SHEAR AND STATIC STABILITY ON LOW-LEVEL VERTICAL ACCELERATIONS IN A SUPERCELL (IA theinfluenceofbo1094561328).pdf
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Summary[edit]
THE INFLUENCE OF BOUNDARY-LAYER SHEAR AND STATIC STABILITY ON LOW-LEVEL VERTICAL ACCELERATIONS IN A SUPERCELL ( ) | ||
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Author |
Caulfield, Sean P. |
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Title |
THE INFLUENCE OF BOUNDARY-LAYER SHEAR AND STATIC STABILITY ON LOW-LEVEL VERTICAL ACCELERATIONS IN A SUPERCELL |
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Publisher |
Monterey, CA; Naval Postgraduate School |
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Description |
It is well documented that tornadoes are formed from a special breed of rotating thunderstorms called supercells, and that tornadogenesis is a result of several factors, one of which is the vertical stretching of low-level vorticity. Not as well understood are the factors that contribute to vertical acceleration of low-level vorticity in the updraft region of a supercell to support tornadogenesis. This paper examined the influence of combining both low-level shear and low-level static stability on low-level vertical accelerations using idealized simulation from Cloud Model 1 (CM1). A matrix of simulations varied the low-level shear and the low-level convective inhibition (CIN) in order to parse out the dynamic response of these parameters on the low-level forcing. When shear was added to simulations, there was a consistent positive response to the low-level dynamic forcing; when low-level CIN was increased, there was a consistent negative response to the low-level buoyant forcing. Despite the chaotic nature of a supercell environment, a balance can be achieved in the lower atmosphere where the low-level CIN can counteract the low-level shear and inhibit the vertical stretching of vorticity. Since this phenomenon is associated with tornadogenesis, a correlation can be made between the ratio of low-level static stability to low-level shear and its effect on tornado formation. Subjects: tornadoes; boundary layer; supercell; shear; static stability |
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Language | English | |
Publication date | December 2018 | |
Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
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Accession number |
theinfluenceofbo1094561328 |
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Source | ||
Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
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This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
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Short title | THE INFLUENCE OF BOUNDARY-LAYER SHEAR AND STATIC STABILITY ON LOW-LEVEL VERTICAL ACCELERATIONS IN A SUPERCELL |
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Image title | |
Author | Caulfield, Sean P. |
Software used | Caulfield, Sean P. |
Conversion program | Adobe PDF Library 11.0 |
Encrypted | no |
Page size | 612 x 792 pts (letter) |
Version of PDF format | 1.4 |