Down‐welling circulation of the northwest European continental shelf: A driving mechanism for the continental shelf carbon pump
Down‐welling circulation of the northwest European continental shelf: A driving mechanism for the continental shelf carbon pump
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DOI：
10.1029/2009gl038997
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发表时间：
2009-07
影响因子：
5.2
通讯作者：
J. Holt;S. Wakelin;J. Huthnance
中科院分区：
文献类型：
--
作者：
J. Holt;S. Wakelin;J. Huthnance
二氧化碳分压的年度综合测量表明，温带大陆架海的季节性分层区域可能是大气二氧化碳的重要汇。支撑这个碳汇的一个关键过程是将碳从大陆架海洋输送到深海永久斜斜层以下。利用西北欧大陆架的水动力学模型模拟，我们发现大尺度环流和摩擦过程都支持碳的现成运输，足以在下一个生长季节开始之前清除一个生长季节所吸收的碳的40%。这种传输是高度不均匀的，一些区域只有微弱的冲刷。只有52%的输出碳被输送到永久斜斜以下，因此陆架海和开放海洋的碳循环本质上是耦合的。
Annually integrated measurements of pCO2 have demonstrated that seasonally stratified regions of temperate shelf seas can be an important sink of atmospheric CO2. A key process to support this sink is the transport of carbon from shelf seas to below the permanent pycnocline of the deep ocean. Using a hydrodynamic model simulation of the northwest European Continental shelf, we find that both the large scale circulation and frictional processes support the off‐shelf transport of carbon sufficiently quickly to remove ∼40% of the carbon sequestered by one growing season before the onset of the next. This transport is highly heterogeneous, with some regions being only weakly flushed. Only 52% of this exported carbon is transported below the permanent pycnocline, hence the shelf sea and open ocean carbon cycles are intrinsically coupled.