Storm tracks and cyclone development using the theoretical concept of the Dynamic State Index (DSI)

Torsten Weber; Peter Névir

doi:10.1111/j.1600-0870.2007.00272.x

Storm tracks and cyclone development using the theoretical concept of the Dynamic State Index (DSI)

Tellus

Volume 60 (2008): Issue 1

By: Torsten Weber and Peter Névir

Open Access

|Jan 2008

Abstract

The Dynamic State Index (DSI) basing on the Energy-Vorticity Theory is able to detect all non-stationary and diabatic processes in the atmosphere. It is shown for the first time that the index is practicable for diagnostic analysis of the synoptic scale, in particular on pressure levels, using the ERA-40 reanalysis data set from the European Centre for Medium-Range Weather Forecasts (ECMWF). To verify the practical value of the DSI as a parameter diagnosing atmospheric developments, the index is applied to the synoptic scale. In a global view two different north hemispheric winters and particularly two case studies concerning the winter storm ‘Lothar’ and hurricane ‘Andrew’ are presented. For analysing the storm structures, both DSI on pressure levels and three-dimensional views of DSI isosurfaces are utilized. The results of this study document that the magnitude of the index expresses the intensification and decaying of the observed vortices. Thereby, it draws conclusions from the steering mechanism of ‘Lothar’ and ‘Andrew’ by virtue of their different DSI structures. A main result for practical weather forecasts is the early visibility of cyclones in the DSI field compared to the pressure field. Furthermore, storm tracks and their intensity can be visualized using the index.

References

Craven , J. P. , Jewell , R. E. and Brooks , H. E. 2002 . Comparison be-tween observed convective cloud-base heights and lifting condensa-tion level for two different lifted parcels . Wea. Forecast . 17 , 885 – 890 .
Search in Google Scholar Back to article
Blender , R. 2005 . Eulerian velocity reconstruction in ideal atmospheric dynamics using potential voracity and potential temperature . J. Phys. A: Math. Gen . 38 , 6419 – 6428 .
Search in Google Scholar Back to article
Davies , J. M. 2006 . Tornadoes in environments with small helicity and/or high LCL heights . Wea. Forecast . 21 , 579 – 594 .
Search in Google Scholar Back to article
Eady , E. T. 1949 . Long waves and cyclone waves . Tellus 1 , 33 – 52 .
Search in Google Scholar Back to article
Ertel , H. 1942 . Ein neuer hydrodynamischer Wirbelsatz . MeteoroL Zeitschrift 59 , 277 – 281 .
Search in Google Scholar Back to article
Hoskins , B. J. , McIntyre , M. E. and Roberston , A. W. 1985 . On the use and significance of isentropic potential voracity maps. Q. J. R. MeteoroL Soc . 111 , 877 - 946 .
Search in Google Scholar Back to article
Landsea , C. W. , Franklin , J. L. , McAdie , C. J. , Beven II , J. L. , Gross , J. M. and co-authors. 2004 . A reanalysis of hurricane Andrew’s intensity . Bull. Amer Met. Soc . 85 , 1699– 1712 .
Search in Google Scholar Back to article
Lopez , L. , Marcos , J. L. , Sanchez , J. L. , Castro , A. and Fraile , R. 2001 . CAPE values and hailstorms on northwestern Spain . Atmos. Res . 56 , 147 – 160 .
Search in Google Scholar Back to article
McCallum , E. 1990 . The Burns’ Day storm, 25 January 1990 . Weather 45 , 166 – 173 .
Search in Google Scholar Back to article
McCoul , E. W. and Cohen , C. 2002 . The impact on simulated storm structure and intensity of variations in the mixed layer and moist layer depths . Mon. Wea. Rev . 130 , 1722 – 1748 .
Search in Google Scholar Back to article
Névir , P. 1993 . Die Hamiltonsche Theorie der Hydrodynamilc und ihre Anwendungen in der grof3räumigen Dynamilc der Atmosphare, Dis-sertation, Freie Universität Berlin.
Search in Google Scholar Back to article
Névir , P. 1998 . Die Nambu-Felddarstellung der Hydro-Thermodynamik und ihre Bedeutung fiir die dynamische Meteorologie, Habilitations-schrift, Freie Universität Berlin.
Search in Google Scholar Back to article
Névir , P. 2004. Ertel’s voracity theorems, the particle relabelling sym-metry and the energy-vorticity theory of fluid mechanics. MeteoroL Zeitschrift 13 , 485 - 498 .
Search in Google Scholar Back to article
Névir , P. and Brand , S. 2003 . Ein dynamischer Wetter- und Klima-Zustandsindex . Terra Nostra , 6. Deutsche Klimatagung - Schriften der Alfred-Wegener-Stiftung , 311 – 314 .
Search in Google Scholar Back to article
Rappaport , E. N. 1994 . Hurricane Andrew. Weather 49 , 51 - 61 .
Search in Google Scholar Back to article
Schär , C. 1993 . A generalization of Bernoulli’s theorem . J. Atmos. Sci . 50 , 1437 – 1443 .
Search in Google Scholar Back to article
Schiiepp , M. , Schiesser , H. H. , Huntrieser , H. , Scherrer , H. U. and Schmidtke , H. 1994 . The winterstorm ‘Vivian’ of 27 February 1990: About the meteorological development, wind forces and damage situ-ation in the forests of Switzerland . Theor. AppL Climatol . 49 , 183 – 200 .
Search in Google Scholar Back to article
Ulbrich , U. , Fink , A. H. , Klawa , M. and Pinto , J. G. 2001 . Three extreme storms over Europe in December 1999 . Weather 56 , 70 – 80 .
Search in Google Scholar Back to article
Wernli , H. , Dirren , S. , Liniger , M. A. and Zillig , M. 2002 . Dynamical aspects of the life cycle of the winter storm ‘Lothar’ (24-26 December 1999) . Q. J. R. MeteoroL Soc . 128 , 405 – 429 .
Search in Google Scholar Back to article