【摘要】 本文利用简单的两层模式和椭园体地形,以纬向气流及常定热源为初始场,进行了青藏高原对它附近环流系统的热力和动力影响的各种数值试验,得到以下一些初步的定性结论: 1.夏季高原上500mb切变线的形成发展主要决定于它的动力影响,但它的热力影响也起到了加强作用。西南低涡的生成在一定条件下完全决定于高原的动力影响,而高原的热力影响是不利于它生成的。孟加拉湾低压的存在也可能与高原的动力作用有关。 2.在青藏高原上空的西风风速较弱时,高原的加热作用对100mb青藏高压的形成与维持影响很大,此时高原南边的热源即使比高原的强很多倍,对这个高压形成的影响也不大。高原的动力作用对100mb青藏高压的生成维持是不利的。更多还原

【Abstract】 In this paper the numerical experiments have been performed by using the simple two-layer p-σ primitive equation model in which we take the Tibetan Plateau as a ellipsoid and the zonal wind and the stationary heat sources as the initial fields. In these experiments we have discussed the thermal and dynamical effect of the orography on the circulation systems over and nearby the Tibetan Plateau and have got the following qualitative results:1. In summer the formation and development of the shearlines over the Tibetan Plateau on 500 mb surface are mainly determined by the dynamical effect of orography and the thermal effect has the contribution to its intensification, too. The formation of the south-west vorte is determined perfectly by the dynamical effect of orography under specific condition and the thermal effect has no contribution. The existence of the-low pressure over the Bay of Bengal is also perhaps related with the dynamical effect of the Tibetan Plateau.2. If the zonal wind velocity is very weak, the thermal effect of the Tibetan Plateau on the formation and maintenance of the Tibetan High on 100 mb surface is very large, while that over the south side of Tibetan Plateau has little effect on its formation, even though the strength of the later is many times larger than that of the former.The dynamical effect of the Tibetan Plateau on Tibetan High on 100mb surface is negative and serves a weakening function.更多还原