Dynamic mechanisms of summer Korean heat waves simulated in a long‐term unforced Community Climate System Model version 3,Atmospheric Science Letters

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Dynamic mechanisms of summer Korean heat waves simulated in a long‐term unforced Community Climate System Model version 3
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2020-04-08 , DOI: 10.1002/asl.973
Han‐Kyoung Kim ₁ , Byung‐Kwon Moon ₁ , Maeng‐Ki Kim ₂ , Minho Kwon ₃

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We investigate the natural variability of summer Korean heat waves through a long‐term (500 year) unforced simulation using the Community Climate System Model version 3. A total of 82 extreme heat wave frequency (HWF) years are identified with positive barotropic geopotential height (GPH) anomalies over the Korean Peninsula. These anomalies represent the most important atmospheric pattern that causes Korean heat waves via adiabatic warming by anomalous subsidence. From a composite analysis of the extreme Korean HWF years, the silk road pattern (SRP) and central Pacific (CP) sea surface temperature (SST) anomalies are selected as the driving factors of extreme Korean heat waves. The positive SRP is a west–east upper‐level Rossby wave train from the North Atlantic to East Asia under which positive barotropic GPH anomalies develop over the Korean Peninsula, thereby producing extreme heat waves. Cold CP SST anomalies induce cyclonic circulation and enhance convection over the subtropical western North Pacific through wind–evaporation–SST feedback, thereby acting as a source of the Pacific–Japan teleconnection pattern. They also cause positive barotropic GPH anomalies over the Korean Peninsula and intensify surface warming.

中文翻译：

在长期无强迫的社区气候系统模型版本3中模拟的夏季韩国热浪的动力机制

我们通过使用社区气候系统模型版本3进行的长期（500年）无强迫模拟，研究了夏季韩国热浪的自然变异性。总共确定了82个极端正热位势高度的极端热浪频率（HWF）年（ GPH）在朝鲜半岛的异常。这些异常代表最重要的大气模式，其通过异常沉降导致的绝热变暖引起了韩国的热浪。通过对韩国极端HWF年的综合分析，选择丝路模式（SRP）和中太平洋（CP）海面温度（SST）异常作为韩国极端热浪的驱动因素。正的SRP是从北大西洋到东亚的东西向高层Rossby波列，在正半岛上，正压GPH异常在朝鲜半岛上发展，从而产生极端的热波。冷CP SST异常通过风-蒸发-SST反馈诱发了北太平洋副热带西部气旋环流并增强了对流，从而成为了太平洋-日本遥相关模式的来源。它们还会在朝鲜半岛上引起正压GPH异常，并加剧表面变暖。

更新日期：2020-04-08

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