Interannual Modulation of Northern Hemisphere Winter Storm Tracks by the QBO
Interannual Modulation of Northern Hemisphere Winter Storm Tracks by the QBO
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DOI：
10.1002/2017gl076929
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发表时间：
2018-03
影响因子：
5.2
通讯作者：
Jiabao Wang;Hyemi Kim;E. Chang
中科院分区：
文献类型：
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作者：
Jiabao Wang;Hyemi Kim;E. Chang
风暴路径被定义为温带天气尺度扰动的首选区域，对全球天气和气候系统有显著影响。人们主要从对流层的角度研究了风暴路径年际变化的原因。研究表明，热带平流层通过准两年振荡(QBO)对北半球冬季风暴路径进行了显著的调制。伴随着涡旋折射和斜压性的偶极子变化，北太平洋风暴轴在QBO东侧冬季向极地移动。北大西洋风暴轴垂直变化，东(西)风QBO冬季与对流层顶高度变化相关的向下收缩(向上扩展)。这些结果不仅填补了QBO-风暴路径关系的认识空白，而且由于QBO具有很高的可预报性，为改进温带风暴活动的季节预报提供了一条潜在的途径。
Storm tracks, defined as the preferred regions of extratropical synoptic‐scale disturbances, have remarkable impacts on global weather and climate systems. Causes of interannual storm track variation have been investigated mostly from a troposphere perspective. As shown in this study, Northern Hemisphere winter storm tracks are significantly modulated by the tropical stratosphere through the quasi‐biennial oscillation (QBO). The North Pacific storm track shifts poleward during the easterly QBO winters associated with a dipole change in the eddy refraction and baroclinicity. The North Atlantic storm track varies vertically with a downward shrinking (upward expansion) in easterly (westerly) QBO winters associated with the change of the tropopause height. These results not only fill the knowledge gap of QBO‐storm track relationship but also suggest a potential route to improve the seasonal prediction of extratropical storm activities owing to the high predictability of the QBO.