YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • AMS
    • Journal of Atmospheric and Oceanic Technology
    • View Item
    •   YE&T Library
    • AMS
    • Journal of Atmospheric and Oceanic Technology
    • View Item
    • All Fields
    • Source Title
    • Year
    • Publisher
    • Title
    • Subject
    • Author
    • DOI
    • ISBN
    Advanced Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Archive

    A Fast Inverse Algorithm Based on the Multigrid Technique for Cloud Tomography

    Source: Journal of Atmospheric and Oceanic Technology:;2014:;volume( 031 ):;issue: 007::page 1653
    Author:
    Zhou, Jun
    ,
    Lei, Hengchi
    ,
    Ji, Lei
    ,
    Hou, Tuanjie
    DOI: 10.1175/JTECH-D-13-00184.1
    Publisher: American Meteorological Society
    Abstract: fast inverse algorithm based on the half-V cycle scheme (HV) of the multigrid technique is developed for cloud tomography. Fourier analysis shows that the slow convergence problem caused by the smoothing property of the iterative algorithm can be effectively alleviated in HV by performing iterations from the coarsest to the finest grid. In this way, the resolvable scales of information contained in observations can be retrieved efficiently on the coarser grid level and the unresolvable scales are left as errors on the finer grid level. Numerical simulations indicate that, compared with the previous algorithm without HV (NHV), HV can significantly reduce the runtime by 89%?96.9% while retaining a similar level of retrieval accuracy. For the currently feasible two-level flight scheme for a 20-km-wide target area, convergence can be accelerated from 407 s in NHV to 13 s in HV. This reduction in time would be multiplied several times if the target area were much wider; but then segmental retrieval would be required to avoid exceeding the time limit of cloud tomography. This improvement represents an important saving in terms of computing resources and ensures the real-time application of cloud tomography in a much wider range of fields.
    • Download: (1.210Mb)
    • Show Full MetaData Hide Full MetaData
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      A Fast Inverse Algorithm Based on the Multigrid Technique for Cloud Tomography

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4228396
    Collections
    • Journal of Atmospheric and Oceanic Technology

    Show full item record

    contributor authorZhou, Jun
    contributor authorLei, Hengchi
    contributor authorJi, Lei
    contributor authorHou, Tuanjie
    date accessioned2017-06-09T17:25:29Z
    date available2017-06-09T17:25:29Z
    date copyright2014/07/01
    date issued2014
    identifier issn0739-0572
    identifier otherams-84999.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4228396
    description abstractfast inverse algorithm based on the half-V cycle scheme (HV) of the multigrid technique is developed for cloud tomography. Fourier analysis shows that the slow convergence problem caused by the smoothing property of the iterative algorithm can be effectively alleviated in HV by performing iterations from the coarsest to the finest grid. In this way, the resolvable scales of information contained in observations can be retrieved efficiently on the coarser grid level and the unresolvable scales are left as errors on the finer grid level. Numerical simulations indicate that, compared with the previous algorithm without HV (NHV), HV can significantly reduce the runtime by 89%?96.9% while retaining a similar level of retrieval accuracy. For the currently feasible two-level flight scheme for a 20-km-wide target area, convergence can be accelerated from 407 s in NHV to 13 s in HV. This reduction in time would be multiplied several times if the target area were much wider; but then segmental retrieval would be required to avoid exceeding the time limit of cloud tomography. This improvement represents an important saving in terms of computing resources and ensures the real-time application of cloud tomography in a much wider range of fields.
    publisherAmerican Meteorological Society
    titleA Fast Inverse Algorithm Based on the Multigrid Technique for Cloud Tomography
    typeJournal Paper
    journal volume31
    journal issue7
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH-D-13-00184.1
    journal fristpage1653
    journal lastpage1662
    treeJournal of Atmospheric and Oceanic Technology:;2014:;volume( 031 ):;issue: 007
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian