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Volume 18 Issue 5

Sep.  2001

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2001 >  18(5): 692-700

The Relationship between the Meridional Profile of Zonal mean Geostrophic Wind and Station Wave at 500 hPa

  • 1.

    Chengdu University of Information Technology, Chengdu 610041,Department of Atmospheric Sciences, University of Washington, Seattle, U.S.A.,Department of Atmospheric Sciences, University of Washington, Seattle, U.S.A.

  • The sea-level pressure (SLP), 500 hPa height, zonal-mean 500 hPa height ([Z500]), stationary wave ed dy component of the 500 hPa height (Z*500) and zonal-mean 500 hPa geostrophic wind [Ug ] fields poleward of 20N are examined for the period 1958-1997, with emphasis on the winter season. The relationships be tween the Arctic Oscillation (AO)index and algebraic difference of the zonal-mean wind in 55N and 35N (Ut) index were investigated, making use the Monte Carlo procedure, Singular Value Decomposition (SVD), Empirical orthogonal function (EOF) and regression method. The leading modes of empirical orthogonal function (EOF＇s) of SLP are more robust than the 500 hPa height EOF＇s, not only in the ratio of the two largest eigenvalues, but in more zonally symmetric. Comparing the meridional profiles of zonal-mean wind amplitude associated with the AO and Ut index, the profiles for the two indexes are very similar, both with respect to amplitude and the placement of the maximum and minimum. Comparing the station wave component of 500 hPa height field regressed upon the AO and Ut index, there is one-to-one correspondence between all the major centers of action in the two maps, especially in the North Atlantic and Eurasian continent. The pattern is unlike the prominent teleconnection patterns, they have hemispheric ex tent and cannot be interpreted in term of the individual wavetrains.
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    • Manuscript History

    Manuscript received: 10 September 2001
    Manuscript revised: 10 September 2001
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    The Relationship between the Meridional Profile of Zonal mean Geostrophic Wind and Station Wave at 500 hPa

    • 1. Chengdu University of Information Technology, Chengdu 610041,Department of Atmospheric Sciences, University of Washington, Seattle, U.S.A.,Department of Atmospheric Sciences, University of Washington, Seattle, U.S.A.
    • Manuscript received: 2001-09-10
    • Manuscript revised: 2001-09-10

    Abstract: The sea-level pressure (SLP), 500 hPa height, zonal-mean 500 hPa height ([Z500]), stationary wave ed dy component of the 500 hPa height (Z*500) and zonal-mean 500 hPa geostrophic wind [Ug ] fields poleward of 20N are examined for the period 1958-1997, with emphasis on the winter season. The relationships be tween the Arctic Oscillation (AO)index and algebraic difference of the zonal-mean wind in 55N and 35N (Ut) index were investigated, making use the Monte Carlo procedure, Singular Value Decomposition (SVD), Empirical orthogonal function (EOF) and regression method. The leading modes of empirical orthogonal function (EOF＇s) of SLP are more robust than the 500 hPa height EOF＇s, not only in the ratio of the two largest eigenvalues, but in more zonally symmetric. Comparing the meridional profiles of zonal-mean wind amplitude associated with the AO and Ut index, the profiles for the two indexes are very similar, both with respect to amplitude and the placement of the maximum and minimum. Comparing the station wave component of 500 hPa height field regressed upon the AO and Ut index, there is one-to-one correspondence between all the major centers of action in the two maps, especially in the North Atlantic and Eurasian continent. The pattern is unlike the prominent teleconnection patterns, they have hemispheric ex tent and cannot be interpreted in term of the individual wavetrains.

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