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Effects of volume averaging on the line spectra of vertical velocity from multiple-Doppler radar observationsCalculations of the ratio of the true one-dimensional spectrum of vertical velocity and that measured with multiple-Doppler radar beams are presented. It was assumed that the effects of pulse volume averaging and objective analysis routines is replacement of a point measurement with a volume integral. A u and v estimate was assumed to be feasible when orthogonal radars are not available. Also, the target fluid was configured as having an infinite vertical dimension, zero vertical velocity at the top and bottom, and having homogeneous and isotropic turbulence with a Kolmogorov energy spectrum. The ratio obtained indicated that equal resolutions among radars yields a monotonically decreasing, wavenumber-dependent response function. A gain of 0.95 was demonstrated in an experimental situation with 40 levels. Possible errors introduced when using unequal resolution radars were discussed. Finally, it was found that, for some flows, the extent of attenuation depends on the number of vertical levels resolvable by the radars.
Document ID
19830039589
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gal-Chen, T.
(NASA Goddard Space Flight Center Greenbelt; Maryland, University, College Park, MD, United States)
Wyngaard, J. C.
(National Center for Atmospheric Research Boulder, CO, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Publication Information
Publication: Journal of Applied Meteorology
Volume: 21
Subject Category
Meteorology And Climatology
Accession Number
83A20807
Distribution Limits
Public
Copyright
Other

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