Abstract
During boreal winter, the invasion of cold air can lead to remarkable temperature drops in East Asia which can result in serious socioeconomic impacts. Here, we find that the intensity of strong synoptic cold days in the East China Sea and Indochina Peninsula are increasing. The enhanced synoptic cold days in these two regions are attributed to surface warming over the South China Sea and Philippine Sea (SCSPS). The oceanic forcing of the SCSPS on the synoptic cold days in the two regions is verified by numerical simulation. The warming of the SCSPS enhances the baroclinicity, which intensifies meridional wind and cold advection on synoptic timescales. This leads to a more extended region that is subject to the influence of cold invasion.
摘 要
北半球冬季寒冷气团的输送, 会导致东亚地区冬季温度显著降低. 尤其从天气尺度来看, 东海及中南半岛的寒冷天气显著增强. 通过数值模拟研究, 作者发现了南海-菲律宾海附近的海表温度异常对东海及中南半岛寒冷天气产生的影响. 南海－菲律宾海附近的海溫增暖, 将使大气低层的斜压性增大, 天气尺度上的经向风和温度平流输送增强, 从而使更广泛的区域受到寒冷气团的影响.
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Acknowledgements
This study was jointly supported by the National Natural Science Foundation of China (Grant Nos. 42120104001, 41805042), the Science and Technology Program of Guangzhou, China (Grant No. 202102020939), and the Fundamental Research Funds for the Central University, Sun Yat-Sen University (Grant No. 22qntd2202), and a project of the Center for Ocean Research in Hong Kong and Macau (CORE).
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Article Highlights
• An increasing trend in the intensity of synoptic cold days is noted in Southeast China, the East China Sea, and the Indochina Peninsula.
• Warming in the SCSPS could enhance baroclinicity over South China and contribute to extended cold air invasion activities in East Asia.
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Leung, M.YT., Wang, D., Zhou, W. et al. Extended Impact of Cold Air Invasions in East Asia in Response to a Warm South China Sea and Philippine Sea. Adv. Atmos. Sci. 40, 531–540 (2023). https://doi.org/10.1007/s00376-022-2096-0
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DOI: https://doi.org/10.1007/s00376-022-2096-0