Volume and freshwater transports through the Canadian Arctic Archipelago–Baffin Bay system
Volume and freshwater transports through the Canadian Arctic Archipelago–Baffin Bay system
复制标题
加拿大北极群岛-巴芬湾系统的水量和淡水运输
DOI：
10.1029/2011jc007019
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发表时间：
2011
影响因子：
--
通讯作者：
B. Rudels
中科院分区：
文献类型：
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作者：
B. Rudels
[1]巴芬湾连接北冰洋和拉布拉多海。它通过加拿大北极群岛和西格陵兰海流接收极地水。极地水经过改造后，通过戴维斯海峡出口。与控制部分的上游和下游巴芬湾邀请使用一个理想化的地转方法来估计运输。首先确定了由北冰洋和巴芬湾之间的密度差驱动的斜压输送。假设兰开斯特海峡、内尔斯海峡和西格陵兰海流的密度和上层深度相同。一旦斜压输送被估计，北冰洋和巴芬湾之间的海平面差被计算。其次，在海平面差保持不变的情况下，纳雷斯海峡和西格陵兰海流的上层深度减小。这使得通过纳雷斯海峡和西格陵兰海流的深层流入成为可能。为了建立一个通过戴维斯海峡的深层外流，从两个“理想”水柱估算了北冰洋和拉布拉多海之间的“正压”海平面坡度。运输计算不同的盐度在极地水和盐度，使更深层的质量平衡。格陵兰冰盖可能增加融化的影响进行了研究。如果融水直接加入巴芬湾的影响是小的，但如果它被纳入东，西格陵兰电流通过群岛流出的显着减少可能会发生。
[1] Baffin Bay connects the Arctic Ocean and the Labrador Sea. It receives Polar water through the Canadian Arctic Archipelago and by the West Greenland Current. The Polar water is, after transformation, exported through Davis Strait. With control sections both upstream and downstream Baffin Bay invites the use of an idealized geostrophic approach to estimate transports. The baroclinic transports, driven by the density differences between the Arctic Ocean and Baffin Bay, are first determined. The density and upper layer depth are assumed the same in Lancaster Sound, Nares Strait and the West Greenland Current. Once the baroclinic transports are estimated the sea level difference between the Arctic Ocean and Baffin Bay is computed. Next the upper layer depth in Nares Strait and the West Greenland Current is reduced, while the sea level difference is kept constant. This allows for deep inflows through Nares Strait and the West Greenland Current. To establish a deep outflow through Davis Strait a “barotropic” sea level slope between the Arctic Ocean and the Labrador Sea is estimated from two “ideal” water columns. The transports are computed for different salinities in the Polar water and the salinity giving mass balance in the deeper layers is determined. The effects of possible increased melting of the Greenland icecap are examined. If the meltwater is added directly to Baffin Bay the effects are small, but if it is incorporated in the East and West Greenland Current a significant reduction of the outflow through the Archipelago might occur.