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The Propagation of Wave Packets and Its Relationship with the Subtropical Jet over Southern China in January 2008


doi: 10.1007/s00376-012-1197-6

  • The propagation of wave packets and its relationship with the subtropical jet was investigated for the period 26–29 January 2008 over southern China using ECMWF Interim re-analysis data. Wave packets propagated from the north to the south side of an upper front with eastward development along the upper front during this period. Due to the eastward development of propagation, the acceleration of geostrophic westerly winds shifted eastward along the front. There were two primary sources of the propagation of wave packets at around 30oN. The first was the temperature inversion layer below 500 hPa, and the second was baroclinic zones located along the polarward flank of the subtropical jet in the middle and upper troposphere. Most wave packets propagated horizontally from the baroclinic zones and then converged on the zero meridional gradients of zonal winds.
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Manuscript History

Manuscript received: 10 January 2013
Manuscript revised: 10 January 2013
通讯作者: 陈斌, bchen63@163.com
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The Propagation of Wave Packets and Its Relationship with the Subtropical Jet over Southern China in January 2008

  • 1. Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, University of Chinese Academy of Sciences, Beijing 100049, Key Laboratory of Middle Atmosphere and Global Environm;Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100029;Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

Abstract: The propagation of wave packets and its relationship with the subtropical jet was investigated for the period 26–29 January 2008 over southern China using ECMWF Interim re-analysis data. Wave packets propagated from the north to the south side of an upper front with eastward development along the upper front during this period. Due to the eastward development of propagation, the acceleration of geostrophic westerly winds shifted eastward along the front. There were two primary sources of the propagation of wave packets at around 30oN. The first was the temperature inversion layer below 500 hPa, and the second was baroclinic zones located along the polarward flank of the subtropical jet in the middle and upper troposphere. Most wave packets propagated horizontally from the baroclinic zones and then converged on the zero meridional gradients of zonal winds.

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