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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. American Meteorological Society. DOI: 10.1175/2009JAS3016.1

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

Abstract

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.

Item URL in elib:https://elib.dlr.de/64088/
Document Type:Article
Title:Coplanar Doppler Lidar Retrieval of Rotors from T-REX
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hill, MichaelArizona State Univ., Tempe, AZ, USAUNSPECIFIED
Calhoun, Ron Arizona State Univ., Tempe, AZ, USAUNSPECIFIED
Fernando, H. J. S.Arizona State Univ., Tempe, AZ, USAUNSPECIFIED
Wieser, AndreasFZ KarlsruheUNSPECIFIED
Dörnbrack, AndreasDLRUNSPECIFIED
Weissmann, MartinDLRUNSPECIFIED
Mayr, GeorgUniv. of Innsbruck, AUNSPECIFIED
Newsom, RobertPacific Northwest National Laboratory, Richland, WA, USAUNSPECIFIED
Date:2010
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:67
DOI :10.1175/2009JAS3016.1
Page Range:pp. 713-729
Publisher:American Meteorological Society
Status:Published
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 assignment
DLR - Research theme (Project):L - no assignment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Freund, Jana
Deposited On:10 May 2010 14:51
Last Modified:06 Sep 2019 15:27

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