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contributor authorFeingold, Graham
contributor authorLevin, Zev
date accessioned2017-06-09T14:01:22Z
date available2017-06-09T14:01:22Z
date copyright1986/10/01
date issued1986
identifier issn0733-3021
identifier otherams-11058.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146244
description abstractMeasurements of rain drop size spectra in Israel were carried out over a period of two years. It is shown that the size distribution can be best described by a lognormal distribution. With its parameters weighted by a certain choice of moments, this distribution has a better squared-error fit to the observed data than the gamma or the exponential distributions. Furthermore, this distribution is well suited for explaining drop size distribution effects in the dual-parameter remote measurement of rainfall. The lognormal distribution has the advantage that all its moments are also lognormally distributed. Its parameters, in their form presented here, have physical meaning (NT=drop concentration, Dg=the geometric mean diameter, and σ=standard geometric deviation). This facilitates direct interpretation of variations in the drop size spectrum. The different moments can easily be integrated to obtain simple expressions for the various rainfall parameters. The observed values of Dg and NT are found to depend more strongly than σ on rainfall rate (R). At high R (>45 mm h?1) the distribution tends to a steady state form (Dg and σ constant). These results suggest that the lognormal representation is suitable for a broad range of applications and can facilitate interpretation of the physical processes which control the shaping of the distribution.
publisherAmerican Meteorological Society
titleThe Lognormal Fit to Raindrop Spectra from Frontal Convective Clouds in Israel
typeJournal Paper
journal volume25
journal issue10
journal titleJournal of Climate and Applied Meteorology
identifier doi10.1175/1520-0450(1986)025<1346:TLFTRS>2.0.CO;2
journal fristpage1346
journal lastpage1363
treeJournal of Climate and Applied Meteorology:;1986:;Volume( 025 ):;Issue: 010
contenttypeFulltext


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