Interconnectivity Between Volume Transports Through Arctic Straits
Interconnectivity Between Volume Transports Through Arctic Straits
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DOI：
10.1029/2018jc014320
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发表时间：
2018-12
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通讯作者：
A. M. Boer;Estanislao Gavilan Pascual‐Ahuir;D. Stevens;L. Chafik;D. Hutchinson;Qiong Zhang;L. Sime;Andrew J. Willmott-
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作者：
A. M. Boer;Estanislao Gavilan Pascual‐Ahuir;D. Stevens;L. Chafik;D. Hutchinson;Qiong Zhang;L. Sime;Andrew J. Willmott-
北极的热量和淡水收支对通过北极-亚北极海峡的运输量非常敏感。在这里，我们研究了三个模型中通过北极海峡的体积传输的相互联系;两个耦合的全球气候模型，一个具有三度水平海洋分辨率（HiGEM 1.1），一个具有十二度水平海洋分辨率（HadGEM 3），一个具有理想化极地盆地（十度水平分辨率）的海洋模型。这两个全球气候模式表明，白令海峡的流量和通过北欧海的输送之间存在着很强的反相关性，通过加拿大北极群岛（CAA）的输送和北欧海的输送之间存在着第二强的反相关性，弗拉姆海峡和巴伦支海的流量之间存在着第三强的反相关性。我们发现，海峡相关性的一部分是由于海峡输送巧合地由大尺度大气强迫模式驱动。然而，也有一些海峡流的扰动，在其他海峡的快波调整的作用，因为单独的海峡流的大气强迫不能导致每年偶然接近质量平衡。理想化的实验与海洋模式（NEMO 3.6），调查这种因果关系的海峡表明，在白令海峡的扰动补偿优先在弗拉姆海峡，由于狭窄的西北极大陆架和更深的深度的弗拉姆海峡。
Arctic heat and freshwater budgets are highly sensitive to volume transports through the Arctic‐Subarctic straits. Here we study the interconnectivity of volume transports through Arctic straits in three models; two coupled global climate models, one with a third‐degree horizontal ocean resolution (HiGEM1.1) and one with a twelfth‐degree horizontal ocean resolution (HadGEM3), and one ocean‐only model with an idealized polar basin (tenth‐degree horizontal resolution). The two global climate models indicate that there is a strong anti‐correlation between the Bering Strait throughflow and the transport through the Nordic Seas, a second strong anti‐correlation between the transport through the Canadian Artic Archipelago (CAA) and the Nordic Seas transport, and a third strong anti‐correlation is found between the Fram Strait and the Barents Sea throughflows. We find that part of the strait correlations is due to the strait transports being coincidentally driven by large‐scale atmospheric forcing patterns. However, there is also a role for fast wave adjustments of some straits flows to perturbations in other straits since atmospheric forcing of individual strait flows alone cannot lead to near mass balance fortuitously every year. Idealized experiments with an ocean model (NEMO3.6) that investigate such causal strait relations suggest that perturbations in the Bering Strait are compensated preferentially in the Fram Strait due to the narrowness of the western Arctic shelf and the deeper depth of the Fram Strait.