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    A Daytime Complement to the Reverse Absorption Technique for Improved Automated Detection of Volcanic Ash

    Source: Journal of Atmospheric and Oceanic Technology:;2006:;volume( 023 ):;issue: 011::page 1422
    Author:
    Pavolonis, Michael J.
    ,
    Feltz, Wayne F.
    ,
    Heidinger, Andrew K.
    ,
    Gallina, Gregory M.
    DOI: 10.1175/JTECH1926.1
    Publisher: American Meteorological Society
    Abstract: An automated volcanic cloud detection algorithm that utilizes four spectral channels (0.65, 3.75, 11, and 12 ?m) that are common among several satellite-based instruments is presented. The new algorithm is physically based and globally applicable and can provide quick information on the horizontal location of volcanic clouds that can be used to improve real-time ash hazard assessments. It can also provide needed input into volcanic cloud optical depth and particle size retrieval algorithms, the products of which can help improve ash dispersion forecasts. The results of this new four-channel algorithm for several scenes were compared to a threshold-based reverse absorption algorithm, where the reverse absorption algorithm is used to identify measurements with a negative 11?12-?m brightness temperature difference. The results indicate that the new four-channel algorithm is not only more sensitive to the presence of volcanic clouds but also generally less prone to false alarms than the standard reverse absorption algorithm. The greatest impact on detection sensitivity is seen in the Tropics, where water vapor can often mask the reverse absorption signal. The four-channel algorithm was able to detect volcanic clouds even when the 11?12-?m brightness temperature difference was greater than +2 K. In the higher latitudes, the greatest impact seen was the significant reduction in false alarms compared to the reverse absorption algorithm and the improved ability to detect optically thick volcanic clouds. Cloud water can also mask the reverse absorption signal. The four-channel algorithm was shown to be more sensitive to volcanic clouds that have a water (ice or liquid water) component than the reverse absorption algorithm.
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      A Daytime Complement to the Reverse Absorption Technique for Improved Automated Detection of Volcanic Ash

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4227632
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    contributor authorPavolonis, Michael J.
    contributor authorFeltz, Wayne F.
    contributor authorHeidinger, Andrew K.
    contributor authorGallina, Gregory M.
    date accessioned2017-06-09T17:23:18Z
    date available2017-06-09T17:23:18Z
    date copyright2006/11/01
    date issued2006
    identifier issn0739-0572
    identifier otherams-84310.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4227632
    description abstractAn automated volcanic cloud detection algorithm that utilizes four spectral channels (0.65, 3.75, 11, and 12 ?m) that are common among several satellite-based instruments is presented. The new algorithm is physically based and globally applicable and can provide quick information on the horizontal location of volcanic clouds that can be used to improve real-time ash hazard assessments. It can also provide needed input into volcanic cloud optical depth and particle size retrieval algorithms, the products of which can help improve ash dispersion forecasts. The results of this new four-channel algorithm for several scenes were compared to a threshold-based reverse absorption algorithm, where the reverse absorption algorithm is used to identify measurements with a negative 11?12-?m brightness temperature difference. The results indicate that the new four-channel algorithm is not only more sensitive to the presence of volcanic clouds but also generally less prone to false alarms than the standard reverse absorption algorithm. The greatest impact on detection sensitivity is seen in the Tropics, where water vapor can often mask the reverse absorption signal. The four-channel algorithm was able to detect volcanic clouds even when the 11?12-?m brightness temperature difference was greater than +2 K. In the higher latitudes, the greatest impact seen was the significant reduction in false alarms compared to the reverse absorption algorithm and the improved ability to detect optically thick volcanic clouds. Cloud water can also mask the reverse absorption signal. The four-channel algorithm was shown to be more sensitive to volcanic clouds that have a water (ice or liquid water) component than the reverse absorption algorithm.
    publisherAmerican Meteorological Society
    titleA Daytime Complement to the Reverse Absorption Technique for Improved Automated Detection of Volcanic Ash
    typeJournal Paper
    journal volume23
    journal issue11
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH1926.1
    journal fristpage1422
    journal lastpage1444
    treeJournal of Atmospheric and Oceanic Technology:;2006:;volume( 023 ):;issue: 011
    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
    yabeshDSpacePersian