The Role of Barents Sea Ice in the Wintertime Cyclone Track and Emergence of a Warm-Arctic Cold-Siberian Anomaly
The Role of Barents Sea Ice in the Wintertime Cyclone Track and Emergence of a Warm-Arctic Cold-Siberian Anomaly
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DOI：
10.1175/jcli-d-11-00449.1
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发表时间：
2012-04-01
影响因子：
4.9
通讯作者：
Takaya, Koutarou
中科院分区：
文献类型：
--
作者：
Inoue, Jun;Hori, Masatake E.;Takaya, Koutarou
巴伦支海的海冰变率及其产生的大气响应被认为是下游意外气候变化的触发因素之一。例如，东亚经历了几次大的寒冷事件，而北极上空的底层温度稳步上升。为了从天气学的角度了解巴伦支海海冰对冬季大气环流的影响，本研究评估了气旋活动的下游响应与底层海冰变率的关系。综合分析，包括北欧海域的所有气旋事件，揭示了在巴伦支海的轻冰期，沿西伯利亚海岸普遍存在反气旋异常。这可能导致了巴伦支海上空的异常暖平流和西伯利亚东部上空的异常冷平流。重冰年和轻冰年气旋路径的差异表现为暖北极冷西伯利亚（WACS）异常。轻冰期巴伦支海较低的斜压性是由于海面温度梯度较弱造成的，这阻止了气旋向东移动。这可能会导致气旋减少，从而导致西伯利亚海岸上空出现反气旋异常。
Sea ice variability over the Barents Sea with its resultant atmospheric response has been considered one of the triggers of unexpected downstream climate change. For example, East Asia has experienced several major cold events while the underlying temperature over the Arctic has risen steadily. To understand the influence of sea ice in the Barents Sea on atmospheric circulation during winter from a synoptic perspective, this study evaluated the downstream response in cyclone activities with respect to the underlying sea ice variability. The composite analysis, including all cyclone events over the Nordic seas, revealed that an anticyclonic anomaly prevailed along the Siberian coast during light ice years over the Barents Sea. This likely caused anomalous warm advection over the Barents Sea and cold advection over eastern Siberia. The difference in cyclone paths between heavy and light ice years was expressed as a warm-Arctic cold-Siberian (WACS) anomaly. The lower baroclinicity over the Barents Sea during the light ice years, which resulted from a weak gradient in sea surface temperature, prevented cyclones from traveling eastward. This could lead to fewer cyclones and hence to an anticyclonic anomaly over the Siberian coast.