A Diagnosis of the Seasonally and Longitudinally Varying Midlatitude Circulation Response to Global Warming
A Diagnosis of the Seasonally and Longitudinally Varying Midlatitude Circulation Response to Global Warming
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DOI：
10.1175/jas-d-13-0325.1
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发表时间：
2014-06
影响因子：
3.1
通讯作者：
I. Simpson;T. Shaw;R. Seager
中科院分区：
文献类型：
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作者：
I. Simpson;T. Shaw;R. Seager
摘要纬向平均或盆地平均分析经常得出结论，随着全球变暖，中纬度环流将发生极地转移。在这项研究中，来自耦合模式比较项目第五阶段的模式被用来提供作为经度和季节函数的中纬度环流变化的详细检验。二维垂直积分动量收支用于确定维持异常地面风应力的主导项，从而区分高频涡旋维持的特征和涉及低频或定常气流变化的特征。在纬向平均中，在每个季节和半球，中纬度地面风应力存在极移，主要由高频瞬变涡旋维持。在当地，情况不一定是这样。在南半球，在很大程度上，对响应的解释是高频涡流驱动的中层向极地移动…
AbstractZonal-mean or basin-mean analyses often conclude that the midlatitude circulation will undergo a poleward shift with global warming. In this study, the models from phase 5 of the Coupled Model Intercomparison Project are used to provide a detailed examination of midlatitude circulation change as a function of longitude and season. The two-dimensional vertically integrated momentum budget is used to identify the dominant terms that maintain the anomalous surface wind stress, thereby allowing a distinction between features that are maintained by high-frequency eddies and those that involve changes in the lower-frequency or stationary flow.In the zonal mean, in each season and hemisphere there is a poleward shifting of the midlatitude surface wind stress, primarily maintained by high-frequency transient eddies. This is not necessarily the case locally. In the Southern Hemisphere, for the most part, the interpretation of the response as being a high-frequency eddy-driven poleward shifting of the midla...