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          Institute: MPI für Kernphysik     Collection: Physics of Atmospheric Molecular Processes     Display Documents



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ID: 315153.0, MPI für Kernphysik / Physics of Atmospheric Molecular Processes
Observational evidence for exponential tornado intensity distributions over specific kinetic energy
Authors:Dotzek, N.; Kurgansky, M. V.; Grieser, J.; Feuerstein, B.; Nevir, P.
Date of Publication (YYYY-MM-DD):2005-12-28
Title of Journal:Geophysical Research Letters
Volume:32
Issue / Number:24
Sequence Number of Article:L24813
Copyright:AGU
Review Status:not specified
Audience:Experts Only
Abstract / Description:Observational evidence supports the recent analytical prediction that tornado intensities are exponentially distributed over peak wind speed squared (nu(2)), or equivalently, Rayleigh-distributed over v. For large USA data samples, exponential tails are found in the tornado intensity distributions over nu(2) from about F2 intensity on. Similar results follow for smaller worldwide data samples. For the 1990s data from the USA and Oklahoma, deviations from the Rayleigh distribution for weak tornadoes can be explained by the emergence of a separate, likely non-mesocyclonic tornado mode. These bimodal datasets can be modeled by superposition of two Rayleigh distributions. The change in modal dominance occurs at about the F2 threshold (nu approximate to 50 m s(-1)). In France, likely mainly the mesocyclonic tornado mode has been recorded, while in the UK, only a non-mesocyclonic mode seems to be present.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of J. Ullrich/Ultra-Short Laser Pulses (U. Morgner)
External Affiliations:DLR, Inst Phys Atmosphare, D-82234 Oberpfaffenhofen, Wessling Germany
Concepcion Univ, Fac Phys & Math Sci, Dept Geophys, Concepcion, Chile
Russian Acad Sci, AM Obukhov Inst Atmospher Phys, Moscow, Russia
Deutsch Wetterdienst, D-63067 Offenbach, Germany
Free Univ Berlin, Inst Meteorol, D-12165 Berlin, Germany
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