The interannual variation of medium-range oscillation characteristics in the upper troposphere over the subtropical region |
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Authors: | Lu Longhua Chen Xianji Zhu Fukang |
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Institution: | Academy of Meteorological Science, State Meteorological Administration, Beijing,Academy of Meteorological Science, State Meteorological Administration, Beijing,Academy of Meteorological Science, State Meteorological Administration, Beijing |
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Abstract: | By using the power spectrum analysis, the interannual variation of medium-range oscillation characteristics in the upper troposphere over the subtropical region in China during June-August, 1966-1981 is studied. The quasi-two and quasi-one week oscillations are the two major oscillations generally existing in the subtropical region, and their intensities have obvious quasi-triennial variation period. These mediumrange oscillation characteristics are closely related to the South Asian high, and in some degree to the summer precipitation in China. The quasi-two week oscillation is probably a display of the inherent oscillation of the south Asian high itself, and the quasi-one week oscillation is probably that of the forced oscillation from westerly disturbances. |
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