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Coplanar Doppler Lidar Retrieval of Rotors from T-REX

Hill, Michael and Calhoun, Ron and Fernando, H. J. S. and Wieser, Andreas and Dörnbrack, Andreas and Weissmann, Martin and Mayr, Georg and Newsom, Robert (2010) Coplanar Doppler Lidar Retrieval of Rotors from T-REX. Journal of the Atmospheric Sciences, 67, pp. 713-729. DOI: 10.1175/2009JAS3016.1.

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Official URL: http://journals.ametsoc.org/doi/pdf/10.1175/2009JAS3016.1


Dual-Doppler analysis of data from two coherent lidars during the Terrain-Induced Rotor Experiment (T-REX) allows the retrieval of flow structures, such as vortices, during mountain-wave events. The spatial and temporal resolution of this approach is sufficient to identify and track vortical motions on an elevated, cross-barrier plane in clear air. Assimilation routines or additional constraints such as two-dimensional continuity are not required. A relatively simple and quick least squares method forms the basis of the retrieval. Vortices are shown to evolve and advect in the flow field, allowing analysis of their behavior in the mountain–wave–boundary layer system. The locations, magnitudes, and evolution of the vortices can be studied through calculated fields of velocity, vorticity, streamlines, and swirl. Generally, observations suggest two classes of vortical motions: rotors and small-scale vortical structures. These two structures differ in scale and behavior. The level of coordination of the two lidars and the nature of the output (i.e., in range gates) creates inherent restrictions on the spatial and temporal resolution of retrieved fields.

Document Type:Article
Title:Coplanar Doppler Lidar Retrieval of Rotors from T-REX
AuthorsInstitution or Email of Authors
Hill, MichaelArizona State Univ., Tempe, AZ, USA
Calhoun, Ron Arizona State Univ., Tempe, AZ, USA
Fernando, H. J. S.Arizona State Univ., Tempe, AZ, USA
Wieser, AndreasFZ Karlsruhe
Dörnbrack, AndreasDLR
Weissmann, MartinDLR
Mayr, GeorgUniv. of Innsbruck, A
Newsom, RobertPacific Northwest National Laboratory, Richland, WA, USA
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 713-729
Keywords:rotor, subrotor, downslope wind, lidar
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:10 May 2010 14:51
Last Modified:26 Mar 2013 13:17

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