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contributor authorFujiwara, Chusei
contributor authorYamashita, Kazuya
contributor authorNakanishi, Mikio
contributor authorFujiyoshi, Yasushi
date accessioned2017-06-09T16:33:52Z
date available2017-06-09T16:33:52Z
date copyright2011/03/01
date issued2010
identifier issn1558-8424
identifier otherams-70072.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211813
description abstractAtmospheric boundary layer (ABL) observations were conducted in an urban area (Sapporo, Japan) from April 2005 to July 2007 using a three-dimensional scanning coherent Doppler lidar. During this period, 50 dust devil?like vortices were detected in the area; they occurred during the daytime and were located at vertices or in the branches of convective cells (?fishnet? patterns of wind field). The diameters of the vortex cores ranged from 30 to 120 m, and maximum vorticity ranged from 0.15 to 0.26 s?1. More than 60% of the vortices were cyclonic; the rest were anticyclonic. The tangential velocity component of the strongest vortex varied from ?5.4 to +1.4 m s?1, and the signal-to-noise ratio was weak in the core. Temporal changes were observed in the three-dimensional structures of two vortices from 1330 to 1354 (Japan standard time) 14 April 2005, and the temporal evolution of the stronger vortex was studied. The vortex initially formed along a low-level convergence line in a fishnet and developed vertically. Its vorticity increased with time in association with shrinkage in the core diameter.
publisherAmerican Meteorological Society
titleDust Devil–Like Vortices in an Urban Area Detected by a 3D Scanning Doppler Lidar
typeJournal Paper
journal volume50
journal issue3
journal titleJournal of Applied Meteorology and Climatology
identifier doi10.1175/2010JAMC2481.1
journal fristpage534
journal lastpage547
treeJournal of Applied Meteorology and Climatology:;2010:;volume( 050 ):;issue: 003
contenttypeFulltext


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