NDLI: Rain fallspeeds and rates derived from airborne nadir-pointing doppler radar measurements

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Rain fallspeeds and rates derived from airborne nadir-pointing doppler radar measurements

Content Provider	NASA Technical Reports Server (NTRS)
Author	Geerts, Bart Tian, L. Heymsfield, Gerald M.
Copyright Year	1999
Description	The use of vertical-incidence Doppler velocity in addition to radar reflectivity may yield information on drop size distribution and therefore result in better rainrate estimates. Doppler velocity can provide useful information on the raindrop size distribution. Doppler velocities from a zenith-pointing radar represent the sum of the mean reflectivity-weighted hydrometeor fallspeed and the vertical air motion. Dual-parameter rain estimation methods using the Doppler velocity, require that the latter can be removed, or is negligible. Atlas et al. (1972) derived relations between Doppler velocity, reflectivity, and rain rate assuming an exponential size distribution for rain. Ulbrich (1994) expanded on this work by deriving the relation between the Doppler velocity and the reflectivity assuming a Gamma size distribution. This distribution provides a more realistic representation of the small rain drops. To get accurate information on raindrop size distributions with the above method, the air motions must be removed from the observed Doppler velocities
File Size	208277
Page Count	3
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19990109159
Archival Resource Key	ark:/13960/t03z36f6q
Language	English
Publisher Date	1999-01-01
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Size Distribution Raindrops Estimating Drop Size Estimates Zenith Radar Measurement Air Flow Airborne Equipment Rain Hydrometeors Doppler Radar Reflectance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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