YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • AMS
    • Monthly Weather Review
    • View Item
    •   YE&T Library
    • AMS
    • Monthly Weather Review
    • 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

    The Effect of Resolution on the Depiction of Central Pressure for an Intense Oceanic Extratropical Cyclone

    Source: Monthly Weather Review:;1992:;volume( 120 ):;issue: 005::page 757
    Author:
    Pauley, Patricia M.
    ,
    Bramer, Bradley J.
    DOI: 10.1175/1520-0493(1992)120<0757:TEOROT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The effect of resolution on the depiction of central sea level pressure for an intense oceanic extratropical cyclone is examined through a one-dimensional Fourier analysis. Profiles of sea level pressure were manually interpolated along the latitude passing through the storm center from two subjective analyses and the 00-, 24-, and 48-h NMC Nested-Grid Model (NGM) forecasts, all valid at 0000 UTC 5 January 1989. At this time, the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) intensive observing period 4 (IOP 4) cyclone attained its maximum intensity, with a central pressure of 936 mb at 41°N, 58°W in an analysis prepared by Frederick Sanders. After the Fourier coefficients were determined for each pressure profile they were used to recompute a series of pressure profiles truncated at various maximum wavenumbers ?max. The central sea level pressures obtained from these truncated profiles asymptotically approach the central pressure of the original profile as ?max increases. An effective resolution is defined as the ?max at which the truncated central pressure comes within 1 mb of the original central pressure. This investigation reveals an effective resolution for the NGM of approximately wave-number 50 (604 km at 41°N) compared to wavenumber 100 (302 km at 41°N) for the hand analyses. A similar examination of the magnitude and location of the maximum v component of the geostrophic wind computed from the pressure profiles supports these estimates of effective resolution. However, maximum gradient wind speed was found to be relatively insensitive to resolution, while maximum geostrophic relative vorticity was overly sensitive to resolution. Consequently, neither of the latter two were used to derive effective resolutions. The recomputed pressure profiles truncated at wavenumber 50 are virtually identical to the original profiles for the NGM cases. However, the truncated pressure profiles for the hand analyses yield central pressures that approach the NGM 00-h value. Thus, resolution differences alone account for approximately half of the 20-mb central-pressure error in the NGM 24- and 48-h forecasts, while apparent deficiencies in the model, initial conditions, or boundary conditions must account for the other half. In other words, the best performance that could be expected from the current NGM configuration is a central pressure of approximately 945 mb rather than 936 mb, assuming the same background pressure.
    • Download: (1.105Mb)
    • Show Full MetaData Hide Full MetaData
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      The Effect of Resolution on the Depiction of Central Pressure for an Intense Oceanic Extratropical Cyclone

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4202777
    Collections
    • Monthly Weather Review

    Show full item record

    contributor authorPauley, Patricia M.
    contributor authorBramer, Bradley J.
    date accessioned2017-06-09T16:08:42Z
    date available2017-06-09T16:08:42Z
    date copyright1992/05/01
    date issued1992
    identifier issn0027-0644
    identifier otherams-61941.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4202777
    description abstractThe effect of resolution on the depiction of central sea level pressure for an intense oceanic extratropical cyclone is examined through a one-dimensional Fourier analysis. Profiles of sea level pressure were manually interpolated along the latitude passing through the storm center from two subjective analyses and the 00-, 24-, and 48-h NMC Nested-Grid Model (NGM) forecasts, all valid at 0000 UTC 5 January 1989. At this time, the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) intensive observing period 4 (IOP 4) cyclone attained its maximum intensity, with a central pressure of 936 mb at 41°N, 58°W in an analysis prepared by Frederick Sanders. After the Fourier coefficients were determined for each pressure profile they were used to recompute a series of pressure profiles truncated at various maximum wavenumbers ?max. The central sea level pressures obtained from these truncated profiles asymptotically approach the central pressure of the original profile as ?max increases. An effective resolution is defined as the ?max at which the truncated central pressure comes within 1 mb of the original central pressure. This investigation reveals an effective resolution for the NGM of approximately wave-number 50 (604 km at 41°N) compared to wavenumber 100 (302 km at 41°N) for the hand analyses. A similar examination of the magnitude and location of the maximum v component of the geostrophic wind computed from the pressure profiles supports these estimates of effective resolution. However, maximum gradient wind speed was found to be relatively insensitive to resolution, while maximum geostrophic relative vorticity was overly sensitive to resolution. Consequently, neither of the latter two were used to derive effective resolutions. The recomputed pressure profiles truncated at wavenumber 50 are virtually identical to the original profiles for the NGM cases. However, the truncated pressure profiles for the hand analyses yield central pressures that approach the NGM 00-h value. Thus, resolution differences alone account for approximately half of the 20-mb central-pressure error in the NGM 24- and 48-h forecasts, while apparent deficiencies in the model, initial conditions, or boundary conditions must account for the other half. In other words, the best performance that could be expected from the current NGM configuration is a central pressure of approximately 945 mb rather than 936 mb, assuming the same background pressure.
    publisherAmerican Meteorological Society
    titleThe Effect of Resolution on the Depiction of Central Pressure for an Intense Oceanic Extratropical Cyclone
    typeJournal Paper
    journal volume120
    journal issue5
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1992)120<0757:TEOROT>2.0.CO;2
    journal fristpage757
    journal lastpage769
    treeMonthly Weather Review:;1992:;volume( 120 ):;issue: 005
    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