北方夏季季内振荡对韩国气温和降水的影响

IF 2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Yoo-Rim Jung, Woo-Seop Lee
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引用次数: 0

摘要

北方夏季季节内振荡(BSISO)是调节东亚夏季气候的亚季节变率的主要模式。本研究探讨了两个不同时间尺度的bssos对韩国温度和降水变化的四种可能影响。当副热带西太平洋上空有活跃的BSISO对流时,会诱发伴随下沉的异常反气旋环流,导致显著的正温度异常。相反,由于副热带西太平洋对流受到抑制,导致朝鲜半岛附近的气旋环流异常,加上低层冷平流异常,导致气温下降。BSISO对流驱动降水变化,其空间分布表现出从菲律宾向朝鲜半岛延伸的三个经向狭窄单体的独特格局。北太平洋西部20°N以北被抑制(增强)的对流促进了副热带高压的西北扩展(东缩),并伴有西南(东北)水汽通量异常。此外,水汽通量辐合增强(减弱)和上升(下降)运动增强为韩国降水正(负)异常创造了有利条件。与单个模态相比,bssos的综合效应不仅放大了平均温度和降水异常,而且增加了更暖、更湿和更干事件的频率。因此,同时监测两种BSISO模式对于理解和预测韩国夏季异常气候至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea

Influence of the boreal summer intraseasonal oscillation on temperature and precipitation in South Korea

The boreal summer intraseasonal oscillation (BSISO) is a major mode of sub-seasonal variability that regulates the summer climate in East Asia. This study investigates the four possible effects of two different time-scale BSISOs on temperature and precipitation variations in South Korea. When active BSISO convection is positioned over the subtropical western Pacific, it induces anomalous anticyclonic circulation accompanied by subsidence, leading to significant positive temperature anomalies. Conversely, the anomalous cyclonic circulation near the Korean Peninsula, resulting from suppressed convection in the subtropical western Pacific, along with low-level cold advection anomalies, contributes to a decrease in temperature. The spatial distribution of BSISO convection, which drives precipitation variation, shows a distinctive pattern of three meridionally narrow cells extending from the Philippines to the Korean Peninsula. Suppressed (enhanced) convection to the north of 20°N in the western North Pacific (WNP) promotes the northwestward expansion (eastward contraction) of the WNP Subtropical High in conjunction with a southwesterly (northeasterly) moisture flux anomaly. Furthermore, enhanced (reduced) moisture flux convergence and intensified ascending (descending) motion create favorable conditions for positive (negative) precipitation anomalies in South Korea. The combined effect of BSISOs not only amplifies the mean temperature and precipitation anomalies compared to individual modes but also increases the frequency of warmer, wetter, and drier events. Therefore, monitoring both BSISO modes together is crucial for comprehending and predicting the anomalous summer climate in South Korea.

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来源期刊
Atmospheric Science Letters
Atmospheric Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.90
自引率
3.30%
发文量
73
审稿时长
>12 weeks
期刊介绍: Atmospheric Science Letters (ASL) is a wholly Open Access electronic journal. Its aim is to provide a fully peer reviewed publication route for new shorter contributions in the field of atmospheric and closely related sciences. Through its ability to publish shorter contributions more rapidly than conventional journals, ASL offers a framework that promotes new understanding and creates scientific debate - providing a platform for discussing scientific issues and techniques. We encourage the presentation of multi-disciplinary work and contributions that utilise ideas and techniques from parallel areas. We particularly welcome contributions that maximise the visualisation capabilities offered by a purely on-line journal. ASL welcomes papers in the fields of: Dynamical meteorology; Ocean-atmosphere systems; Climate change, variability and impacts; New or improved observations from instrumentation; Hydrometeorology; Numerical weather prediction; Data assimilation and ensemble forecasting; Physical processes of the atmosphere; Land surface-atmosphere systems.
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