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contributor authorLiu, Qingfu
contributor authorKogan, Yefim L.
contributor authorLilly, Douglas K.
contributor authorJohnson, Douglas W.
contributor authorInnis, George E.
contributor authorDurkee, Philip A.
contributor authorNielsen, Kurt E.
date accessioned2017-06-09T14:36:26Z
date available2017-06-09T14:36:26Z
date copyright2000/08/01
date issued2000
identifier issn0022-4928
identifier otherams-22681.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159158
description abstractThe LES model is applied for studying ship track formation under various boundary layer conditions observed during the Monterey Area Ship Track experiment. Simulations in well-mixed and decoupled boundary layers show that ship effluents are easily advected into the cloud layer in the well-mixed convective boundary layer, whereas their transport may be suppressed by the subcloud transitional layer in the decoupled case. The clear difference between the well-mixed and decoupled cases suggests the important role of diurnal variation of solar radiation and consequent changes in the boundary layer stability for ship track formation. The authors hypothesize that, all other conditions equal, ship track formation may be facilitated during the morning and evening hours when the effects of solar heating are minimal. In a series of experiments, the authors also studied the effects of additional buoyancy caused by the heat from the ship engine exhaust, the strength of the subcloud transitional layer, and the subcloud layer saturation conditions. The authors conclude that additional heat from ship engine and the increase in ship plume buoyancy may indeed increase the amount of the ship effluent penetrating into the cloud layer. The result, however, depends on the strength of the stable subcloud transitional layer. Another factor in the ship effluent transport is the temperature of the subcloud layer. Its decrease will result in lowering the lifting condensation level and increased ship plume buoyancy. However, the more buoyant plumes in this case have to overcome a larger potential barrier. The relation between all these parameters may be behind the fact that ship tracks sometimes do, and sometimes do not, form in seemingly similar boundary layer conditions.
publisherAmerican Meteorological Society
titleModeling of Ship Effluent Transport and Its Sensitivity to Boundary Layer Structure
typeJournal Paper
journal volume57
journal issue16
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(2000)057<2779:MOSETA>2.0.CO;2
journal fristpage2779
journal lastpage2791
treeJournal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 016
contenttypeFulltext


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