The atmospheric frontal response to SST perturbations in the Gulf Stream region
The atmospheric frontal response to SST perturbations in the Gulf Stream region
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DOI：
10.1002/2016gl067723
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发表时间：
2016-03
影响因子：
5.2
通讯作者：
R. Parfitt;A. Czaja;S. Minobe;A. Kuwano‐Yoshida
中科院分区：
文献类型：
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作者：
R. Parfitt;A. Czaja;S. Minobe;A. Kuwano‐Yoshida
在1981-2000年12月至2月的墨西哥湾流环流模式中探讨了海表温度梯度与大气锋之间的联系。分析了两个模型实验，一个是实际控制海温分布，另一个是空间平滑海温分布。分析表明，区域大气锋面频率在两次试验之间有明显的变化（高达30%），变化的分布表现出明显的GS海温锋面印记。对穿越冷锋的地表感热通量梯度的进一步分析表明，这种变化模式是由海洋和大气锋面之间的热相互作用介导的（“热阻尼和加强”）。这些结果不仅强调了北半球海温梯度对北大西洋风暴发展的重要性，而且强调了在评估锋面海气相互作用在中纬度气候变率中的作用时分辨率的重要性。
The link between sea surface temperature (SST) gradients and atmospheric fronts is explored in a general circulation model across the Gulf Stream (GS) region from December to February 1981–2000. Two model experiments are analyzed, one with a realistic control SST distribution and one with a spatially smoothed SST distribution. The analysis shows a noticeable change in regional atmospheric frontal frequency between the two experiments (up to 30%), with the distribution of change exhibiting a clear imprint of the GS SST front. Further analysis of the surface sensible heat flux gradient across cold fronts reveals the pattern of change to be mediated by a thermal interaction between the oceanic and atmospheric fronts (“thermal damping and strengthening”). These results not only emphasize the significance of the GS SST gradient for storm development in the North Atlantic but also highlight the importance of resolution in assessing the role of frontal air‐sea interaction in midlatitude climate variability.