Coplanar doppler lidar retrieval of rotors from T-REX

Michael Hill, Ronald Calhoun, H. J S Fernando, Andreas Wieser, Andreas Dörnbrack, Martin Weissmann, Georg Mayr, Robert Newsom

Research output: Contribution to journalArticle

36 Scopus citations

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 re-trieval. 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.

Original languageEnglish (US)
Pages (from-to)713-729
Number of pages17
JournalJournal of the Atmospheric Sciences
Volume67
Issue number3
DOIs
StatePublished - Mar 1 2010

ASJC Scopus subject areas

  • Atmospheric Science

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    Hill, M., Calhoun, R., Fernando, H. J. S., Wieser, A., Dörnbrack, A., Weissmann, M., Mayr, G., & Newsom, R. (2010). Coplanar doppler lidar retrieval of rotors from T-REX. Journal of the Atmospheric Sciences, 67(3), 713-729. https://doi.org/10.1175/2009JAS3016.1