摘要
利用一次较成功地模拟了“95 .1”青藏高原东北部大雪过程的 MM5中尺度模式输出资料 ,根据条件对称不稳定 (CSI)的非线性理论判据对这次大雪过程进行了动力学诊断分析 ,结果表明 ,大雪的发生发展过程与σ2 正值区的分布和演变非常一致 ,表明“95 .1”大雪是由明显的湿对称不稳定所致。
With the criteria of linear and nonlinear symmetric instability theory,the mechanism of the heavy snowstorm of January 17—18 1995(″95.1″)occurred in the northeast region of the Qinghai Xizang Plateau was diagnosed by using the output data of a MM5 mesoscale numerical model with which the developing structure and the evolution of the ″95.1″ snowstorn were fairly well simulated.The results suggested that the positive σ 2 is corresponding to the development and movement of the snowstorm and the limited comparison lends some support to the hypothesis that non linear CSI can be a dominant formative mechanism of the ″95.1″ snowstorm,though more sophisticated studies are required.
出处
《气象》
CSCD
北大核心
2000年第7期9-11,19,共4页
Meteorological Monthly
基金
国家自然科学基金!资助项目 :4 97752 71
关键词
高原大雪
非线性对称不稳定
诊断分析
snowstorm Qinghai Xizang plateau nonlinear symmetric instability diagnosis analysis
