Abstract
In contrast to previous studies that have tended to focus on the influence of the total Arctic sea-ice cover on the East Asian summer tripole rainfall pattern, the present study identifies the Barents Sea as the key region where the June sea-ice variability exerts the most significant impacts on the East Asian August tripole rainfall pattern, and explores the teleconnection mechanisms involved. The results reveal that a reduction in June sea ice excites anomalous upward air motion due to strong near-surface thermal forcing, which further triggers a meridional overturning wave-like pattern extending to midlatitudes. Anomalous downward motion therefore forms over the Caspian Sea, which in turn induces zonally oriented overturning circulation along the subtropical jet stream, exhibiting the east–west Rossby wave train known as the Silk Road pattern. It is suggested that the Bonin high, a subtropical anticyclone predominant near South Korea, shows a significant anomaly due to the eastward extension of the Silk Road pattern to East Asia. As a possible descending branch of the Hadley cell, the Bonin high anomaly ultimately triggers a meridional overturning, establishing the Pacific–Japan pattern. This in turn induces an anomalous anticyclone and cyclone pair over East Asia, and a tripole vertical convection anomaly meridionally oriented over East Asia. Consequently, a tripole rainfall anomaly pattern is observed over East Asia. Results from numerical experiments using version 5 of the Community Atmosphere Model support the interpretation of this chain of events.
摘要
以往研究主要关注整个北极区域海冰变化对东亚夏季三极子型降水的影响, 本文则从遥相关角度揭示了6月巴伦支海海冰变率对8月东亚三极子型降水的作用. 结果表明, 6月巴伦支海海冰减少, 通过近地表较强的热力作用引起局地大气的上升运动异常, 进一步激发向中纬度延伸的经向翻转波列, 在里海形成大气下沉运动异常. 通过沿着副热带急流的纬向翻转环流, 该下层运动异常会激发一个东西向的罗斯贝波列, 类似于丝绸之路型. 丝绸之路型向东亚的延伸, 对位于韩国附近的副热带反气旋环流-小笠原高压产生显著影响. 作为哈德莱环流圈的一个下沉支, 异常小笠原高压引起的经向翻转环流形成了太平洋-日本遥相关型, 进一步促进了东亚地区一对异常反气旋和气旋环流、异常的经向三极子垂直对流的产生. 最终, 东亚出现三极子型降水异常. CAM5的数值模拟结果也支持本文的观点.
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Acknowledgements
This research was supported by the National Key R&D Program of China (Grant No. 2016YFA0600703), the National Natural Science Foundation of China (Grant Nos. 41605059, 41505073 and 41375083), the Young Talent Support Program of the China Association for Science and Technology (Grant No. 2016QNRC001), and the Research Council of Norway SNOWGLACE (244166/E10) project.
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He, S., Gao, Y., Furevik, T. et al. Teleconnection between sea ice in the Barents Sea in June and the Silk Road, Pacific–Japan and East Asian rainfall patterns in August. Adv. Atmos. Sci. 35, 52–64 (2018). https://doi.org/10.1007/s00376-017-7029-y
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DOI: https://doi.org/10.1007/s00376-017-7029-y