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contributor authorSmedman, A.
contributor authorHögström, U.
contributor authorSahleé, E.
contributor authorDrennan, W. M.
contributor authorKahma, K. K.
contributor authorPettersson, H.
contributor authorZhang, F.
date accessioned2017-06-09T16:28:09Z
date available2017-06-09T16:28:09Z
date copyright2009/09/01
date issued2009
identifier issn0022-4928
identifier otherams-68420.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209976
description abstractBy combining simultaneous data from an instrumented Air?Sea Interaction Spar (ASIS) buoy and a 30-m tower, profiles of wind and turbulence characteristics have been obtained at several heights from about 1 to 30 m above the water surface during swell conditions. Five cases formed as averages over time periods ranging from 2.5 to 9.5 h, representing quasi-steady conditions, have been selected. They represent a range of typical wave age and include wind-following swell cases and cross-swell cases. For relatively large wave age, the wind profile exhibits a well-defined maximum in the height range 5?10 m; for more modest wave age, this maximum turns into a sharp ?knee? in the wind profile. Below the maximum (or knee), the wind increases rapidly with height; above that point the wind is very nearly constant up to the highest measuring level on the tower, 30 m. Analysis of balloon data from one day with swell indicates that the layer with constant wind in fact extends to the top of the boundary layer, in this case ?200 m. Analysis of the complete swell dataset from the 45 days of the 2003 Baltic Swell experiment shows that the results concerning wind profile shape obtained from the selected cases are generally valid in this experiment. Analysis of the nondimensional wind profile ?m shows that Monin?Obukhov scaling is not valid during swell. Wind and turbulence characteristics are found not to vary to a significant degree with the wind/swell angle within the range of angles encountered, ±90°.
publisherAmerican Meteorological Society
titleObservational Study of Marine Atmospheric Boundary Layer Characteristics during Swell
typeJournal Paper
journal volume66
journal issue9
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/2009JAS2952.1
journal fristpage2747
journal lastpage2763
treeJournal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 009
contenttypeFulltext


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