NDLI: Radar observation of large attenuation in convective storms: implications for the dropsize distribution

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Radar observation of large attenuation in convective storms: implications for the dropsize distribution

Content Provider	NASA Technical Reports Server (NTRS)
Author	Tian, Lin Srivastava, R. C. Heymsfield, G. M.
Copyright Year	2000
Description	Airborne meteorological radars typically operate at attenuating wavelengths. The path integrated attenuation (PIA) can be estimated using the surface reference technique (SRT). In this method, an initial value is determined for the radar cross section of the earth surface in a rain-free area in relatively close proximity to the rain cloud. During subsequent observations of precipitation any decrease 'in the observed surface cross section from the reference value s assumed to be a result of the two-way attenuation along the propagation path. In this paper we present selected instances of high PIA observed over land by an airborne radar. The observations were taken in Brazil and Florida during TRMM (Tropical Rainfall Measurement Mission) field campaigns. We compared these observations with collocated and nearly simultaneous ground-based radar observations by an S-band radar that is not subject to significant attenuation. In this preliminary evaluation, a systematic difference in the attenuation in the two storms is attributed to a difference in the raindrop size distributions; this is supported by observations of ZDR (differential reflectivity).
File Size	299861
File Format	PDF
Language	English
Publisher Date	2000-01-01
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Size Distribution Ultrahigh Frequencies Storms Airborne Radar Radar Cross Sections Raindrops Trmm Satellite Radar Tracking Attenuation Earth Surface Convection 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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