Northward flow in the Bering and Chukchi seas
Northward flow in the Bering and Chukchi seas
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DOI：
10.1029/jc092ic07p07097
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发表时间：
1987-06
影响因子：
--
通讯作者：
J. Overland;A. T. Roach
中科院分区：
文献类型：
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作者：
J. Overland;A. T. Roach
利用正压数值模式研究了白令海和楚科奇海陆架的海洋环流。在冬季季节性风应力的存在下，从东北，观察到的北输送通过白令海峡的0.6 Sv的8个月的冬季1981-1982年可以驱动的海平面之间的差异0.4米的太平洋和北冰洋。盆地之间的海平面差异与水文学估计一致。在没有风应力的情况下，0.4米的海平面差驱动着1.1西沃特的白令海峡向北输送。通过白令海峡的最大输运是受地转限制的，而不是受重力或惯性限制的。在模拟中，该区域的主要质量环流特征是明显的。确认了穿越白令海大陆架的向北输送的向西增强，主要输送发生在相对较深的阿纳迪尔湾。在无风条件下，阿纳迪尔海峡贡献了通过白令海峡向北输送的72%。在东北风的情况下，圣劳伦斯岛周围有一个净顺时针环流。在20米等深线内，诺顿音和科策布音受大气环流的影响很小。楚科奇海向北的运输在霍普角附近分叉。主要的分支在先驱浅滩以南的一个广阔的峡谷中朝向西北方向，平衡成为里斯本角和巴罗角之间的阿拉斯加沿岸流。
The ocean circulation on the Bering and Chukchi sea shelves is investigated using a barotropic numerical model. In the presence of the winter seasonal wind stress from the northeast, observed northward transport through Bering Strait of 0.6 Sv for the 8-month winter season 1981–1982 can be driven by a sea level difference of 0.4 m between the Pacific and Arctic oceans. This sea level difference between basins is in agreement with hydrographic estimates. In the absence of wind stress a 0.4-m sea level difference drives a northward transport through Bering Strait of 1.1 Sv. Maximum transport through Bering Strait is geostrophically limited, not frictionally or inertially limited. Major qualitative circulation features of the region are evident in the simulations. Westward intensification of the northward transport across the Bering Sea shelf is confirmed, with the major transport occurring in the relatively deep Gulf of Anadyr. In the absence of wind, Anadyr Strait contributes 72% of the northward transport through Bering Strait. With northeasterly winds there is a net clockwise circulation around Saint Lawrence Island. Within the 20-m isobath, Norton and Kotzebue sounds are little influenced by the general circulation. Northward transport in the Chukchi Sea bifurcates in the vicinity of Point Hope. The predominant branch is directed toward the northwest in a broad canyon feature south of Herald Shoal, and the balance becomes the Alaskan Coastal Current between Cape Lisburne and Point Barrow.