YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • AMS
    • Journal of Climate
    • View Item
    •   YE&T Library
    • AMS
    • Journal of Climate
    • 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

    Dynamics of the West African Westerly Jet

    Source: Journal of Climate:;2010:;volume( 023 ):;issue: 023::page 6263
    Author:
    Pu, Bing
    ,
    Cook, Kerry H.
    DOI: 10.1175/2010JCLI3648.1
    Publisher: American Meteorological Society
    Abstract: The West African westerly jet (WAWJ) is a low-level westerly jet located at 8°?11°N over the eastern Atlantic and the West African coast. It is clearly distinguished from the monsoon westerly flow by its structure and dynamics, and plays an important role in transporting moisture from the tropical eastern Atlantic to Sahelian West Africa during boreal summer. The WAWJ develops in early June, sustains maximum wind speeds of 5?6 m s?1 from late July to early September, and weakens and dissipates by mid-October. In its mature stage, the WAWJ is located within the Atlantic ITCZ. It extends from the surface to 700 hPa, with maximum speed at 925 hPa. The jet has a weak semidiurnal cycle, with maxima at 0500 and 1700 local time. A momentum budget analysis reveals that the WAWJ forms when a region of strong westerly acceleration is generated by the superposition of the Atlantic ITCZ and the westward extension of the continental thermal low. The WAWJ is supergeostrophic at its maximum, with zonal pressure gradient and Coriolis accelerations both pointing eastward. While much of the WAWJ?s seasonal variation can be explained by the geostrophic wind, the ageostrophic wind contributes more than 40% of the wind speed during the jet?s formation and demise. The westward extension of the thermal low is associated with the formation of an offshore low, which is related to seasonal warming of the ocean between 6° and 18°N along the coast. The coastal SSTs vary in response to a net surface heating pattern with warming to the north and cooling to the south, which is mainly controlled by solar radiative and latent heat fluxes.
    • Download: (3.000Mb)
    • Show Full MetaData Hide Full MetaData
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      Dynamics of the West African Westerly Jet

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4212429
    Collections
    • Journal of Climate

    Show full item record

    contributor authorPu, Bing
    contributor authorCook, Kerry H.
    date accessioned2017-06-09T16:35:46Z
    date available2017-06-09T16:35:46Z
    date copyright2010/12/01
    date issued2010
    identifier issn0894-8755
    identifier otherams-70627.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212429
    description abstractThe West African westerly jet (WAWJ) is a low-level westerly jet located at 8°?11°N over the eastern Atlantic and the West African coast. It is clearly distinguished from the monsoon westerly flow by its structure and dynamics, and plays an important role in transporting moisture from the tropical eastern Atlantic to Sahelian West Africa during boreal summer. The WAWJ develops in early June, sustains maximum wind speeds of 5?6 m s?1 from late July to early September, and weakens and dissipates by mid-October. In its mature stage, the WAWJ is located within the Atlantic ITCZ. It extends from the surface to 700 hPa, with maximum speed at 925 hPa. The jet has a weak semidiurnal cycle, with maxima at 0500 and 1700 local time. A momentum budget analysis reveals that the WAWJ forms when a region of strong westerly acceleration is generated by the superposition of the Atlantic ITCZ and the westward extension of the continental thermal low. The WAWJ is supergeostrophic at its maximum, with zonal pressure gradient and Coriolis accelerations both pointing eastward. While much of the WAWJ?s seasonal variation can be explained by the geostrophic wind, the ageostrophic wind contributes more than 40% of the wind speed during the jet?s formation and demise. The westward extension of the thermal low is associated with the formation of an offshore low, which is related to seasonal warming of the ocean between 6° and 18°N along the coast. The coastal SSTs vary in response to a net surface heating pattern with warming to the north and cooling to the south, which is mainly controlled by solar radiative and latent heat fluxes.
    publisherAmerican Meteorological Society
    titleDynamics of the West African Westerly Jet
    typeJournal Paper
    journal volume23
    journal issue23
    journal titleJournal of Climate
    identifier doi10.1175/2010JCLI3648.1
    journal fristpage6263
    journal lastpage6276
    treeJournal of Climate:;2010:;volume( 023 ):;issue: 023
    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