Jet-Topography Interactions Affect Energy Pathways to the Deep Southern Ocean

Jet-Topography Interactions Affect Energy Pathways to the Deep Southern Ocean
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急流与地形的相互作用影响南大洋深处的能量路径

DOI:
10.1175/jpo-d-16-0220.1
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发表时间:
2017
影响因子:
3.5
通讯作者:
S. Keating
S. Keating
中科院分区:
地球科学2区
文献类型:
--
作者:
A. Barthel;A. Hogg;S. Waterman;S. Keating

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摘要在南大洋,强烈的向东的海洋急流与大的地形特征相互作用,产生反馈到平均流的涡旋。深入的涡流与地形相互作用,湍流耗散和内部背风波的产生在海洋的能量收支中起着重要作用。然而,深海中的涡流效应很难观察,也很难定性。本研究探讨当海洋急流遇到地形时,在深度的漩涡中所含的能量。本研究使用一个两层海洋模型,其中强加的不稳定射流遇到地形障碍(无论是海山或海脊)的配置相关的南极绕极流锋面射流。作者发现,地形的存在增加了涡动动能(EKE)在深度,但产生这种深EKE的主要过程取决于障碍物的形状和高度,以及在遇到地形之前的斜压性射流。我...
AbstractIn the Southern Ocean, strong eastward ocean jets interact with large topographic features, generating eddies that feed back onto the mean flow. Deep-reaching eddies interact with topography, where turbulent dissipation and generation of internal lee waves play an important role in the ocean’s energy budget. However, eddy effects in the deep ocean are difficult to observe and poorly characterized. This study investigates the energy contained in eddies at depth, when an ocean jet encounters topography. This study uses a two-layer ocean model in which an imposed unstable jet encounters a topographic obstacle (either a seamount or a meridional ridge) in a configuration relevant to an Antarctic Circumpolar Current frontal jet. The authors find that the presence of topography increases the eddy kinetic energy (EKE) at depth but that the dominant processes generating this deep EKE depend on the shape and height of the obstacle as well as on the baroclinicity of the jet before it encounters topography. I...
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