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    A New Rossby Wave–Breaking Interpretation of the North Atlantic Oscillation

    Source: Journal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 002::page 609
    Author:
    Woollings, Tim
    ,
    Hoskins, Brian
    ,
    Blackburn, Mike
    ,
    Berrisford, Paul
    DOI: 10.1175/2007JAS2347.1
    Publisher: American Meteorological Society
    Abstract: This paper proposes the hypothesis that the low-frequency variability of the North Atlantic Oscillation (NAO) arises as a result of variations in the occurrence of upper-level Rossby wave?breaking events over the North Atlantic. These events lead to synoptic situations similar to midlatitude blocking that are referred to as high-latitude blocking episodes. A positive NAO is envisaged as being a description of periods in which these episodes are infrequent and can be considered as a basic, unblocked situation. A negative NAO is a description of periods in which episodes occur frequently. A similar, but weaker, relationship exists between wave breaking over the Pacific and the west Pacific pattern. Evidence is given to support this hypothesis by using a two-dimensional potential-vorticity-based index to identify wave breaking at various latitudes. This is applied to Northern Hemisphere winter data from the 40-yr ECMWF Re-Analysis (ERA-40), and the events identified are then related to the NAO. Certain dynamical precursors are identified that appear to increase the likelihood of wave breaking. These suggest mechanisms by which variability in the tropical Pacific, and in the stratosphere, could affect the NAO.
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      A New Rossby Wave–Breaking Interpretation of the North Atlantic Oscillation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206741
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    contributor authorWoollings, Tim
    contributor authorHoskins, Brian
    contributor authorBlackburn, Mike
    contributor authorBerrisford, Paul
    date accessioned2017-06-09T16:18:41Z
    date available2017-06-09T16:18:41Z
    date copyright2008/02/01
    date issued2008
    identifier issn0022-4928
    identifier otherams-65508.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206741
    description abstractThis paper proposes the hypothesis that the low-frequency variability of the North Atlantic Oscillation (NAO) arises as a result of variations in the occurrence of upper-level Rossby wave?breaking events over the North Atlantic. These events lead to synoptic situations similar to midlatitude blocking that are referred to as high-latitude blocking episodes. A positive NAO is envisaged as being a description of periods in which these episodes are infrequent and can be considered as a basic, unblocked situation. A negative NAO is a description of periods in which episodes occur frequently. A similar, but weaker, relationship exists between wave breaking over the Pacific and the west Pacific pattern. Evidence is given to support this hypothesis by using a two-dimensional potential-vorticity-based index to identify wave breaking at various latitudes. This is applied to Northern Hemisphere winter data from the 40-yr ECMWF Re-Analysis (ERA-40), and the events identified are then related to the NAO. Certain dynamical precursors are identified that appear to increase the likelihood of wave breaking. These suggest mechanisms by which variability in the tropical Pacific, and in the stratosphere, could affect the NAO.
    publisherAmerican Meteorological Society
    titleA New Rossby Wave–Breaking Interpretation of the North Atlantic Oscillation
    typeJournal Paper
    journal volume65
    journal issue2
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2007JAS2347.1
    journal fristpage609
    journal lastpage626
    treeJournal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 002
    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
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