东亚天气系统与行星锋区活动相关特征的数值试验

NUMERICAL EXPERIMENTS ON CORRELATION BETWEEN THE EAST-ASIAN WEATHER SYSTEM AND THE ACTIVITIES IN THE PLANETARY FRONTAL ZONE

本文采用p-σ混合坐标十二层初始方程模式,研究东亚气旋生成频数分布与行星锋区活动、青藏高原大地形动力效应的相关问题。数值试验结果表明,东亚气旋发生、移动与行星锋区气候位置有显著相关;西风急流、青藏高原地形强迫因素的共同作用导致了高原低涡、小高压与切变线活动的特征分布。

A ρ-σ incorporated coordinate 12-layer primitive equationmodel is adopted to investigate the distribution characteristics of theEast-Asian cyclogenesis frequency in relation to the activities in thepanetary frontal zone and dynamic effects of the Qinghai-Xizang Plateau.Numerical experiments show that the development and motion of the East-Asian cyclone are significantly correlated to the climatological locationof the frontal zone, and the joint effects of the westerly jet stream andthe forcing of the plateau's orography result in the distributioncharacteristics of vortexes, small highs and shears over the hugetopography and the difference in their tracks.