Observational evidence for exponential tornado distributions over specific kinetic energy
Dotzek, Nikolai and Kurgansky, Michael V. and Grieser, Jürgen and Feuerstein, Bernold and Nevir, Peter (2005) Observational evidence for exponential tornado distributions over specific kinetic energy. Geophysical Research Letters, 32. DOI: 10.1029/2005GL024583.
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Observational evidence supports the recent analytical prediction that tornado intensities are exponentially distributed over peak wind speed squared (v 2), or equivalently, Rayleigh-distributed over v. For large USA data samples, exponential tails are found in the tornado intensity distributions over v 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 (v ≈ 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.
|Title:||Observational evidence for exponential tornado distributions over specific kinetic energy|
|Date:||28 December 2005|
|Journal or Publication Title:||Geophysical Research Letters|
|In Open Access:||Yes|
|In ISI Web of Science:||Yes|
|Keywords:||Tornado, Intensity distribution, Kinetic energy density|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben Atmosphären- und Klimaforschung (old)|
|Institutes and Institutions:||Institute of Atmospheric Physics > Atmospheric Dynamics|
|Deposited By:||Dr.rer.nat. Nikolai Dotzek|
|Deposited On:||16 Apr 2007|
|Last Modified:||02 Dec 2009 09:15|
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