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    Correction of ADCP Compass Errors Resulting from Iron in the Instrument’s Vicinity

    Source: Journal of Atmospheric and Oceanic Technology:;2014:;volume( 032 ):;issue: 003::page 591
    Author:
    Appen, Wilken-Jon von
    DOI: 10.1175/JTECH-D-14-00043.1
    Publisher: American Meteorological Society
    Abstract: ron in the vicinity of compasses results in compass deviations. ADCPs mounted on steel buoyancy devices and deployed on seven moorings on the East Greenland outer shelf and upper slope from 2007 to 2008 suffered from severe compass deviations as large as 90°, rendering the ADCP data useless without a compass correction. The effects on the measured velocities, which may also be present in other oceanic velocity measurements, are explained. On each of the moorings, velocity measurements from a different instrument are overlapping in space and time with the compromised measurements. The iron was not in the vicinity of this second instrument, and the instrument is therefore assumed not to be affected by compass deviations. A method is described to determine the compass deviation from the compromised and uncompromised velocity measurements, and the compromised compass headings. The method depends on the assumptions that at least one instrument per mooring is not compromised and that the change in flow direction over the vertical distance from the compromised to the uncompromised velocity measurement is zero on average. With this method, the compromised headings and the compromised velocity records can be corrected. The method is described in detail and a MATLAB function implementing the method is supplied. The success of the method is demonstrated for a mooring with a minor compass deviation and for one with a large amplitude deviation.
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      Correction of ADCP Compass Errors Resulting from Iron in the Instrument’s Vicinity

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4228497
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    contributor authorAppen, Wilken-Jon von
    date accessioned2017-06-09T17:25:45Z
    date available2017-06-09T17:25:45Z
    date copyright2015/03/01
    date issued2014
    identifier issn0739-0572
    identifier otherams-85089.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4228497
    description abstractron in the vicinity of compasses results in compass deviations. ADCPs mounted on steel buoyancy devices and deployed on seven moorings on the East Greenland outer shelf and upper slope from 2007 to 2008 suffered from severe compass deviations as large as 90°, rendering the ADCP data useless without a compass correction. The effects on the measured velocities, which may also be present in other oceanic velocity measurements, are explained. On each of the moorings, velocity measurements from a different instrument are overlapping in space and time with the compromised measurements. The iron was not in the vicinity of this second instrument, and the instrument is therefore assumed not to be affected by compass deviations. A method is described to determine the compass deviation from the compromised and uncompromised velocity measurements, and the compromised compass headings. The method depends on the assumptions that at least one instrument per mooring is not compromised and that the change in flow direction over the vertical distance from the compromised to the uncompromised velocity measurement is zero on average. With this method, the compromised headings and the compromised velocity records can be corrected. The method is described in detail and a MATLAB function implementing the method is supplied. The success of the method is demonstrated for a mooring with a minor compass deviation and for one with a large amplitude deviation.
    publisherAmerican Meteorological Society
    titleCorrection of ADCP Compass Errors Resulting from Iron in the Instrument’s Vicinity
    typeJournal Paper
    journal volume32
    journal issue3
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH-D-14-00043.1
    journal fristpage591
    journal lastpage602
    treeJournal of Atmospheric and Oceanic Technology:;2014:;volume( 032 ):;issue: 003
    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