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Vorticity from line-of-sight lidar velocity scans

Weissmann, Martin and Dörnbrack, Andreas and Doyle, James D. (2009) Vorticity from line-of-sight lidar velocity scans. Journal of Atmospheric and Oceanic Technology, 26, pp. 2683-2690.

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Official URL: http://ams.allenpress.com/perlserv/?request=get-archive&issn=1520-0426

Abstract

A method is presented to compute the spanwise vorticity in polar coordinates from 2D vertical cross-sections of high-resolution line-of-sight Doppler wind lidar observations. The method uses the continuity equation to derive the velocity component perpendicular to the observed line-of-sight velocity, which then yields the spanwise vorticity component. The results of the method are tested using a ground-based Doppler lidar, which was deployed during the Terrain-induced Rotor Experiment (T-REX). The resulting fields can be used to identify and quantify the strength and size of vortices, such as those associated with atmospheric rotors. Furthermore, they may serve to investigate the dynamics and evolution of vortices and to evaluate numerical simulations. A demonstration of the method and comparison with high resolution numerical simulations reveals that the derived vorticity can explain 66% of the mean square vorticity fluctuations, has a reasonably skillful magnitude and exhibits no significant bias, and is in qualitative agreement with model-derived vorticity.

Document Type:Article
Title:Vorticity from line-of-sight lidar velocity scans
Authors:
AuthorsInstitution or Email of Authors
Weissmann, MartinUNSPECIFIED
Dörnbrack, AndreasUNSPECIFIED
Doyle, James D. Naval Research Lab., Monterey, USA
Date:December 2009
Journal or Publication Title:Journal of Atmospheric and Oceanic Technology
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:26
Page Range:pp. 2683-2690
Status:Published
Keywords:Rotor, Doppler Lidar, Vorticity, Turbulence,
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Applikationsentwicklung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Martin Weissmann
Deposited On:03 Dec 2009 15:24
Last Modified:07 Feb 2013 20:29

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