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contributor authorThompson, Elizabeth J.
contributor authorRutledge, Steven A.
contributor authorDolan, Brenda
contributor authorThurai, Merhala
date accessioned2017-06-09T16:57:51Z
date available2017-06-09T16:57:51Z
date copyright2015/11/01
date issued2015
identifier issn0022-4928
identifier otherams-77139.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219664
description abstractwo-dimensional video disdrometer (2DVD) data were analyzed from two equatorial Indian (Gan) and west Pacific Ocean (Manus) islands where precipitation is primarily organized by the intertropical convergence zone and the Madden?Julian oscillation (MJO). The 18 (3.5) months of 2DVD data from Manus (Gan) Island show that 1) the two sites have similar drop size distribution (DSD) spectra of liquid water content, median diameter, rain rate R, radar reflectivity z, normalized gamma number concentration Nw, and other integral rain parameters; 2) there is a robust Nw-based separation between convective (C) and stratiform (S) DSDs at both sites that produces consistent separation in other parameter spaces.The 2DVD data indicate an equatorial, maritime average C/S rainfall accumulation fraction (frequency) of 81/19 (41/59) at these locations. It is hypothesized that convective fraction and frequency estimates are slightly higher than previous radar-based studies, because the ubiquitous weak, shallow convection (<10 mm h?1) characteristic of the tropical warm pool is properly resolved by this high-resolution DSD dataset and identification method. This type of convection accounted for about 30% of all rain events and 15% of total rain volume. These rain statistics were reproduced when newly derived C/S R(z) equations were applied to 2DVD-simulated reflectivity. However, the benefits of using separate C/S R(z) equations are only realizable when C/S partitioning properly classifies each rain type. A single R(z) relationship fit to all 2DVD data yielded accurate total rainfall amounts but overestimated (underestimated) the stratiform (convective) rain fraction by ±10% and overestimated (underestimated) stratiform (convective) rain accumulation by +50% (?15%).
publisherAmerican Meteorological Society
titleDrop Size Distributions and Radar Observations of Convective and Stratiform Rain over the Equatorial Indian and West Pacific Oceans
typeJournal Paper
journal volume72
journal issue11
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/JAS-D-14-0206.1
journal fristpage4091
journal lastpage4125
treeJournal of the Atmospheric Sciences:;2015:;Volume( 072 ):;issue: 011
contenttypeFulltext


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