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基于副热带高压异常活动个例的动力模型重构与变异特性剖析

DOI: 10.11867/j.issn.1001-8166.2014.11.1250, PP. 1250-1261

Keywords: 副热带高压,遗传算法,动力模型重构,分岔突变

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Abstract:

针对1998年夏季造成我国严重洪涝灾害的副热带高压异常活动,基于动力系统重构思想和遗传算法,从1998年观测资料时间序列中反演重构了副热带高压活动的非线性动力模型,并结合天气实况进行了副热带高压活动变异的动力特性分析。结果表明,针对副热带高压异常个例实际观测资料反演重构的副热带高压活动的非线性动力模型,可客观描述副热带高压活动(特别是异常活动)特征并予以合理的机理解释。进一步的分析讨论表明,随着强迫参数的逐渐增加,副热带高压动力系统将会发生平衡态的分岔、突变,平衡态的上述变化与实际天气过程中的副热带高压北跳、南落以及副热带高压双脊线现象有很好的对应关联,并可对其进行合理的机理解释,进而为副热带高压等难以准确构建解析模型的复杂天气系统的机理分析和动力特性讨论提供参考。

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