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Quasi-40-Day Oscillation and Its Teleconnection Struc-ture together with the Possible Dependence on Conversion of Barotropic Unstable Energy of Temporal Mean Flow


doi: 10.1007/BF02919141

  • A study is made of the distribution of the diagnostic quantity vector E and the teleconnection structure of 30-50 (quasi-40) day oscillation, together with the dependence on the conversion of barotropic unstable energy of mean flow in terms of ECWMF daily 500 hPa grid data in winter, indicating that the energy transportation is closely associated with the westerly jet position, with zonal (meridional) propagation in the strong (weak) wind region, that considerable conversion of barotropic energy occurs at the jet exit region where low-frequency oscillation gains energy from the mean flow, leading to maximum kinetic energy for the oscillation observed there, which is marked by evident barotropy in striking contrast to the baroclinicity at low latitudes and that the teleconnection core is related to the center of action in the atmosphere and bound up with the pattern of the west wind.
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Manuscript History

Manuscript received: 10 March 1993
Manuscript revised: 10 March 1993
通讯作者: 陈斌, bchen63@163.com
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Quasi-40-Day Oscillation and Its Teleconnection Struc-ture together with the Possible Dependence on Conversion of Barotropic Unstable Energy of Temporal Mean Flow

  • 1. Nanjing Institute of Meteorology, Nanjing 210044

Abstract: A study is made of the distribution of the diagnostic quantity vector E and the teleconnection structure of 30-50 (quasi-40) day oscillation, together with the dependence on the conversion of barotropic unstable energy of mean flow in terms of ECWMF daily 500 hPa grid data in winter, indicating that the energy transportation is closely associated with the westerly jet position, with zonal (meridional) propagation in the strong (weak) wind region, that considerable conversion of barotropic energy occurs at the jet exit region where low-frequency oscillation gains energy from the mean flow, leading to maximum kinetic energy for the oscillation observed there, which is marked by evident barotropy in striking contrast to the baroclinicity at low latitudes and that the teleconnection core is related to the center of action in the atmosphere and bound up with the pattern of the west wind.

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