contributor author | Sauvageot, Henri | |
contributor author | Lacaux, Jean-Pierre | |
date accessioned | 2017-06-09T14:32:56Z | |
date available | 2017-06-09T14:32:56Z | |
date copyright | 1995/04/01 | |
date issued | 1995 | |
identifier issn | 0022-4928 | |
identifier other | ams-21422.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4157760 | |
description abstract | The shape of averaged drop size distributions (DSD) is studied from a large sample of data (892 h) collected at several sites of various latitudes. The results show that neither the hypothesis of an exponential distribution to represent rainfall with a high rain raw (R) nor the concept of equilibrium distribution arising from the various models using the parameterization of Low and List is compatible with the observations. To describe the DSD two regions have to be distinguished: a small-drop region, for diameter D smaller than a threshold Dc, and a large-drop region, for diameter D larger than Dc. For DDc, the slope of the distributions is almost independent of D. At low values of R (<20 mm h?1) it decreases when R increases, and not much depends on z0. For increasing values of R beyond about 20 mm h?1, the slope of the distributions tends toward a constant value of about 2.2?2.3 mm?1. This suggests a certain stationarity between the coalescence and collisional breakup processes in intense rainfalls. It also appears that the two regions are not much influenced by each other. The value of Dc increases with R and with z0. The relation between the radar reflectivity factor (Z) and R obtained from the averaged DSDs are close to those calculated from nonaveraged data and compatible with those proposed in the literature. The differences observed between the coefficients of Z?R relations for various types of rain are essentially due to the differences in small-drop concentration. | |
publisher | American Meteorological Society | |
title | The Shape of Averaged Drop Size Distributions | |
type | Journal Paper | |
journal volume | 52 | |
journal issue | 8 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/1520-0469(1995)052<1070:TSOADS>2.0.CO;2 | |
journal fristpage | 1070 | |
journal lastpage | 1083 | |
tree | Journal of the Atmospheric Sciences:;1995:;Volume( 052 ):;issue: 008 | |
contenttype | Fulltext | |