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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Recurrence of Intraseasonal Cold Air Outbreak during the 2009/2010 Winter in Japan and its Ties to the Atmospheric Condition over the Barents-Kara Sea
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Recurrence of Intraseasonal Cold Air Outbreak during the 2009/2010 Winter in Japan and its Ties to the Atmospheric Condition over the Barents-Kara Sea

机译：2009/2010年冬季日本季节内冷空气暴发的复发及其与巴伦支-卡拉海大气条件的联系

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References(12) Cited-By(15) Supplementary materials(2) In the winter of 2009/2010, Japan and the East Asian region experienced a frequent occurrence of cold air outbreaks. Although the winter average temperature in the Japan main islands was slightly positive (+0.81°C for DJF average and +0.71°C for NDJFM average), repeated decline in temperature was notable throughout the season. One explanation for this abnormal winter season is the extremely negative condition of the Arctic Oscillation (AO) that persisted from December to mid-January. However, AO alone does not provide sufficient explanation for the cold air outbreak during November or its intraseasonal periodicity. A case study of the cold air outbreak that reached Japan on Dec. 18 reveals an anomalous ridge forming over the Barents-Kara Sea, which leads to the cold air accumulation over western Siberia. The pressure anomaly subsequently shifted westward to mature into a blocking high which created a wave-train pattern downstream, advecting the cold air eastward towards East Asia and Japan. The sequence of events was also apparent in multiple cases throughout the season. This study suggests that there is a strong and systematic linkage in the intraseasonal timescale between the atmospheric condition over the Barents-Kara Sea and the cold air accumulation over the Eurasian continent, leading to the anomalous cold air outbreak over East Asia and Japan. The mechanism may also provide explanation to extreme winter conditions such as those observed during the winter of 2010/2011.
机译：参考文献（12）被引用的文献（15）补充材料（2）在2009/2010年冬季，日​​本和东亚地区频繁发生冷空气暴发。尽管日本主要岛屿的冬季平均气温略有正向（DJF平均值为+ 0.81°C，NDJFM平均值为+ 0.71°C），但整个季节的气温均出现反复下降。对于这种异常冬季的一种解释是，北极涛动（AO）在12月至1月中持续存在，是极为不利的状况。但是，仅AO并不能为11月期间的冷空气暴发或其季节内周期性提供充分的解释。一项针对12月18日到达日本的冷空气暴发的案例研究显示，在Barents-Kara海上形成了异常的山脊，导致西伯利亚西部的冷空气积聚。随后，压力异常向西移动，逐渐成熟，达到了阻塞的高点，在下游形成了波列模式，向东吹向东亚和日本的冷空气。在整个季节的多个案例中，事件的顺序也很明显。这项研究表明，Barents-Kara海上空的大气状况与欧亚大陆上的冷空气蓄积之间的季节内时间尺度之间存在紧密而系统的联系，从而导致东亚和日本的异常冷空气暴发。该机制还可以为极端冬季条件提供解释，例如在2010/2011年冬季期间观察到的那些条件。

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