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Record Details

Record 43 of 16201
Effects of volume averaging on the line spectra of vertical velocity from multiple-Doppler radar observations
External Online Source: doi:10.1175/1520-0450(1982)021<1881:EOVAOT>2.0.CO;2
Author and Affiliation:
Gal-Chen, T.(NASA Goddard Space Flight Center, Greenbelt)
Wyngaard, J. C.(National Center for Atmospheric Research, Boulder, CO, United States)
Abstract: Calculations 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.
Publication Date: Dec 01, 1982
Document ID:
19830039589
(Acquired Nov 30, 1995)
Accession Number: 83A20807
Subject Category: METEOROLOGY AND CLIMATOLOGY
Document Type: Journal Article
Publication Information: Journal of Applied Meteorology; p. Dec. 198; 21
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Maryland Univ.; College Park, MD, United States
National Center for Atmospheric Research; Boulder, CO, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ATMOSPHERIC TURBULENCE; DOPPLER RADAR; LINE SPECTRA; RADAR MEASUREMENT; WIND VELOCITY MEASUREMENT; RADAR RESOLUTION; SPECTRUM ANALYSIS; VERTICAL AIR CURRENTS
Imprint And Other Notes: Journal of Applied Meteorology, vol. 21, Dec. 1982, p. 1881-1890.
Miscellaneous Notes: p. 1881-1890
Availability Source: Other Sources
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