The Arctic Circumpolar Boundary Current
The Arctic Circumpolar Boundary Current
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DOI：
10.1029/2010jc006637
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发表时间：
2011-09-17
影响因子：
3.6
通讯作者：
Beszczynska-Moeller, Agnieszka
中科院分区：
文献类型：
--
作者：
Aksenov, Yevgeny;Ivanov, Vladimir V.;Beszczynska-Moeller, Agnieszka
我们提出了高分辨率的模拟和观测数据作为证据的快速电流流动沿着在北冰洋的西伯利亚和阿拉斯加大陆架的大陆架断裂。到目前为止，北极绕极边界流（ACBC）被视为由两个分支组成：弗拉姆海峡和巴伦支海分支（分别为FSB和BSB）。在这里，我们描述了一个新的第三个分支，北极大陆架断裂分支（ASBB）。我们发现，强迫机制的ASBB是浮力损失和非本地风的组合，在巴伦支海上游产生高压。通过圣安娜海槽的位涡流入决定了ASBB的气旋性流动方向，ASBB是北冰洋最具活力的大尺度环流结构。它在输送北极盐跃层沃茨方面发挥着重要作用，并表现出夏季最低和冬季最高的强劲季节性循环。模拟结果表明，FSB的连续性一直围绕北极大陆架和不间断的ASBB之间的圣安娜海槽和西部弗拉姆海峡。BSB连续沿着西伯利亚大陆架一直流到楚科奇高原，在那里它部分地从大陆坡分流到海洋内部。阿拉斯加陆架断裂流（ASC）是加拿大北极ASBB的类似物。由于太平洋和北冰洋之间的海面高度下降，白令海峡的本地风和上游高压迫使ASC。
We present high-resolution simulations and observational data as evidence of a fast current flowing along the shelf break of the Siberian and Alaskan shelves in the Arctic Ocean. Thus far, the Arctic Circumpolar Boundary Current (ACBC) has been seen as comprising two branches: the Fram Strait and Barents Sea Branches (FSB and BSB, respectively). Here we describe a new third branch, the Arctic Shelf Break Branch (ASBB). We show that the forcing mechanism for the ASBB is a combination of buoyancy loss and non-local wind, creating high pressure upstream in the Barents Sea. The potential vorticity influx through the St. Anna Trough dictates the cyclonic direction of flow of the ASBB, which is the most energetic large-scale circulation structure in the Arctic Ocean. It plays a substantial role in transporting Arctic halocline waters and exhibits a robust seasonal cycle with a summer minimum and winter maximum. The simulations show the continuity of the FSB all the way around the Arctic shelves and the uninterrupted ASBB between the St. Anna Trough and the western Fram Strait. The BSB flows continuously along the Siberian shelf as far as the Chukchi Plateau, where it partly diverges from the continental slope into the ocean interior. The Alaskan Shelf break Current (ASC) is the analog of the ASBB in the Canadian Arctic. The ASC is forced by the local winds and high upstream pressure in Bering Strait, caused by the drop in sea surface height between the Pacific and Arctic Oceans.