| 摘 要： | In this paper, the essential role played by tie Tibetan Plateau in the formation of large scale low level jet over China is shown. Using the ECMWF limited area model we have performed some numerical experiments with various modified orography for a real case. The comparison of no-mountain run with the control one shows that the Plateau acts as a west boundary to the flows from the south, thus helping concentrate the momentum in a narrow belt. The close connection between the jet and the monsoon current is also investigated. The confluence of the currents from the subtropical high and mid-latitude trough mainly results in the strong wind centre at mid-troposphere rather than at lower level.
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