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    A Comparison of Three Satellite-Based Methods for Estimating Surface Winds over Oceans

    Source: Journal of Applied Meteorology:;1981:;volume( 020 ):;issue: 004::page 439
    Author:
    Wylie, Donald P.
    ,
    Hinton, Barry B.
    ,
    Millett, Kellie M.
    DOI: 10.1175/1520-0450(1981)020<0439:ACOTSB>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The feasibility of using satellites for providing surface winds or wind stress data was explored. Three popular methods were compared using nearly colocated data to assess the accuracies of each and the coverage that each could provide. The three methods tested were 1) the use of the sun glitter reflection seen on visible images of the ocean surface; 2) the use of active microwave sensors (flown on SEASAT) which reflect microwaves off the ocean surface; and 3) the use of cloud motions as indicators of the surface winds. Close agreement in wind speed estimates was found among the three methods. The biases were <0.6 m s?1 for comparisons between comparable methods of estimating surface winds (1 and 2). Cloud motion comparisons to the other methods exhibited biases of <3.0 m s?1. Individual point-by-point comparisons between wind measurements had an average scatter of 2.0 m s?1 (rms) or less after the mean biases were removed. Atmospheric variability caused as many of the differences as the instrumental errors indicating that meaningful wind information could be obtained from all three methods. Very detailed spacial coverage was obtained with the sun-glitter method for wind speeds. However, the coverage was restricted to a narrow band 5° of latitude wide in the tropics. SEASAT also provided good coverage for two swaths (4° longitude wide) on each side of the satellite's orbit. Gaps between the swaths and orbits (polar non-synchronous orbits) were left unsampled. Both methods required external data on the wind directions which were obtained from cloud motions. The cloud motions provided coverage over larger areas than the other two methods because of the abundance of low-level cumuli.
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      A Comparison of Three Satellite-Based Methods for Estimating Surface Winds over Oceans

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4145130
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    • Journal of Applied Meteorology

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    contributor authorWylie, Donald P.
    contributor authorHinton, Barry B.
    contributor authorMillett, Kellie M.
    date accessioned2017-06-09T13:58:08Z
    date available2017-06-09T13:58:08Z
    date copyright1981/04/01
    date issued1981
    identifier issn0021-8952
    identifier otherams-10055.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4145130
    description abstractThe feasibility of using satellites for providing surface winds or wind stress data was explored. Three popular methods were compared using nearly colocated data to assess the accuracies of each and the coverage that each could provide. The three methods tested were 1) the use of the sun glitter reflection seen on visible images of the ocean surface; 2) the use of active microwave sensors (flown on SEASAT) which reflect microwaves off the ocean surface; and 3) the use of cloud motions as indicators of the surface winds. Close agreement in wind speed estimates was found among the three methods. The biases were <0.6 m s?1 for comparisons between comparable methods of estimating surface winds (1 and 2). Cloud motion comparisons to the other methods exhibited biases of <3.0 m s?1. Individual point-by-point comparisons between wind measurements had an average scatter of 2.0 m s?1 (rms) or less after the mean biases were removed. Atmospheric variability caused as many of the differences as the instrumental errors indicating that meaningful wind information could be obtained from all three methods. Very detailed spacial coverage was obtained with the sun-glitter method for wind speeds. However, the coverage was restricted to a narrow band 5° of latitude wide in the tropics. SEASAT also provided good coverage for two swaths (4° longitude wide) on each side of the satellite's orbit. Gaps between the swaths and orbits (polar non-synchronous orbits) were left unsampled. Both methods required external data on the wind directions which were obtained from cloud motions. The cloud motions provided coverage over larger areas than the other two methods because of the abundance of low-level cumuli.
    publisherAmerican Meteorological Society
    titleA Comparison of Three Satellite-Based Methods for Estimating Surface Winds over Oceans
    typeJournal Paper
    journal volume20
    journal issue4
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1981)020<0439:ACOTSB>2.0.CO;2
    journal fristpage439
    journal lastpage449
    treeJournal of Applied Meteorology:;1981:;volume( 020 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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