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Simulation of radar reflectivity and surface measurements of rainfallRaindrop size distributions (RSDs) are often estimated using surface raindrop sampling devices (e.g., disdrometers) or optical array (2D-PMS) probes. A number of authors have used these measured distributions to compute certain higher-order RSD moments that correspond to radar reflectivity, attenuation, optical extinction, etc. Scatter plots of these RSD moments versus disdrometer-measured rainrates are then used to deduce physical relationships between radar reflectivity, attenuation, etc., which are measured by independent instruments (e.g., radar), and rainrate. In this paper RSDs of the gamma form as well as radar reflectivity (via time series simulation) are simulated to study the correlation structure of radar estimates versus rainrate as opposed to RSD moment estimates versus rainrate. The parameters N0, D0 and m of a gamma distribution are varied over the range normally found in rainfall, as well as varying the device sampling volume. The simulations are used to explain some possible features related to discrepancies which can arise when radar rainfall measurements are compared with surface or aircraft-based sampling devices.
Document ID
19880029205
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chandrasekar, V.
(Colorado State Univ. Fort Collins, CO, United States)
Bringi, V. N.
(Colorado State University Fort Collins, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1987
Publication Information
Publication: Journal of Atmospheric and Oceanic Technology
Volume: 4
ISSN: 0739-0572
Subject Category
Meteorology And Climatology
Report/Patent Number
AD-A194004
Accession Number
88A16432
Funding Number(s)
CONTRACT_GRANT: DAAL03-86-K-0117
Distribution Limits
Public
Copyright
Other

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