Kinematic processes contributing to the intensification of anomalously strong North Atlantic jets
Kinematic processes contributing to the intensification of anomalously strong North Atlantic jets
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导致异常强烈的北大西洋急流增强的运动过程
DOI：
10.1002/qj.4037
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发表时间：
2021
影响因子：
8.9
通讯作者：
Winters, Andrew C.
中科院分区：
文献类型：
--
作者：
Winters, Andrew C.
异常强烈的北大西洋急流，在这项研究中定义为风速超过100 m·s−1的急流，由于它们可能引起高影响天气而值得注意。这项研究探讨了运动学过程，有助于加强异常强大的北大西洋急流，以及在这些过程中的变化，在大量的事件。1979年9月至2018年5月期间，在气候预报系统再分析中客观地识别出异常强急流，并将其合成，以揭示与急流增强相关的天气尺度流动演变。分析表明，与秋季和春季相比，冬季北大西洋急流最频繁，并且它们的发展之前有低层暖空气平流，向极水汽平流和赤道急流入口区域下方的地面气旋温暖输送带内的潮湿上升。对近急流环境中非地转风的无旋和无辐散分量的诊断表明，这两种风分量通过对动力对流层顶附近的负位涡平流和位涡锋生的不可忽略的贡献，促进了急流的加强。天气研究和预报（WRF）模型对2013年12月的急流事件进行了模拟，有和没有潜热加热进一步表明，近急流环境中的非地转风场基本上受到潜热加热的调制。上述结果表明，在异常强烈的喷流事件期间，喷流增强的诊断取决于近喷流环境内潜热加热累积效应的准确表示。
Anomalously strong North Atlantic jets, defined in this study as jets with wind speeds exceeding 100 m·s−1, are notable due to their potential to induce high‐impact weather. This study examines the kinematic processes that contribute to the intensification of anomalously strong North Atlantic jets, as well as the variability in those processes across a large number of events. Anomalously strong jets are objectively identified during September–May 1979–2018 within the Climate Forecast System Reanalysis and composited to reveal the synoptic‐scale flow evolution associated with jet intensification. The analysis demonstrates that anomalously strong North Atlantic jets are most frequent during the winter compared with the fall and spring, and that their development is preceded by low‐level warm‐air advection, poleward moisture advection, and moist ascent within the warm conveyor belt of a surface cyclone beneath the equatorward jet‐entrance region. A diagnosis of the irrotational and nondivergent components of the ageostrophic wind within the near‐jet environment reveals that both wind components facilitate jet intensification via their nonnegligible contributions to negative potential vorticity (PV) advection and PV frontogenesis in the vicinity of the dynamic tropopause. Weather Research and Forecasting (WRF) model simulations of a jet event from December 2013 with and without latent heating further suggest that the ageostrophic wind field within the near‐jet environment is substantially modulated by latent heating. The foregoing results indicate that a diagnosis of jet intensification during anomalously strong jet events is dependent on an accurate representation of the cumulative effects of latent heating within the near‐jet environment.
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影响因子：
5.2
作者：
Lavers, David A.;Villarini, Gabriele
通讯作者：
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影响因子：
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作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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