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《Journal of Nanjing University(Natural Sciences)》 2007-02
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Numerical Experiments for the Impacts of the Uplift of the Tibetan Plateau on the Variation of East Asian Subtropical Westerly Jet

Dong Guang-Tao,Zhang Yao-Cun(Department of Atmospheric Sciences,Nanjing University,Nanjing,210093,China)  
Sensitive experiments were performed by using a regional climate model with p-σ incorporated coordinate to investigate the impacts of the uplift of the Tibetan Plateau on the East Asian subtropical westerly jet(EAWJ).The variation of the vertical structure and the horizontal structure of EAWJ at the different uplift height of the Tibetan plateau as well as the reason for the variation of EAWJ had also been analyzed in this paper.The numerical experiment results indicate that with the uplifting of the Tibetan plateau the westerly jet along 90°E in winter from lower layer to upper layer is obviously strengthened to the south side of the plateau,and the westerly wind along 115°E in mid-upper layer is obviously enhanced to the south of 35°N,while the westerly wind weakens to the north of 35°N.In summer the changes of EAWJ in vertical structure are evident.Along 90°E the easterly wind in mid-upper layer is obviously weakened to the south of the plateau,and the westerly wind in mid-upper layer along 140°E is enhanced to the south of 35°N but it is obviously weakened to the north of 35°N.Analysis of the variation of the EAWJ horizontal structure shows that the zonal wind at 200 hPa along 40°N from 100°E to 120°E is weakened while the zonal wind at 200 hPa is strengthed from Bay of Bengal to South China area.In summer the zonal wind at 200 hPa is obviously weakened along 42°N from 120°E to 150°E while it is markedly enhanced along 25°N from 120°E to 150°E.The devouring role of the Plateau together with the variation of the temperature averaged from 500 hPa to 200 hPa which is caused by the enhance of the cold cradle role of the Plateau and the increase of the latent heat flux in the south of Japan bring on the changes of EAWJ in winter.While in summer,the decrease of the latent heat flux over the Korean Peninsula and south Japan together with the enhance of the warm cradle role of the Plateau results in the temperature change averaged from 500 hPa to 200 hPa,and further leads to the variation of EAWJ.In addition,regardless of the winter or the summer,the variation of temperature in the mid-upper troposphere and the resulted variation of the zonal wind at 200 hPa are most remarkable during the period from when the plateau height uplifts from 1/4 of the present height to half of the present height.
【Fund】: 国家自然科学基金项目(40675041)
【CateGory Index】: P461.3
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