Widespread intense turbulent mixing in the Southern Ocean
Widespread intense turbulent mixing in the Southern Ocean
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DOI：
10.1126/science.1090929
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发表时间：
2004-01-09
期刊：
影响因子：
56.9
通讯作者：
Visbeck, M
中科院分区：
文献类型：
--
作者：
Garabato, ACN;Polzin, KL;Visbeck, M
对内波速度波动的观测表明，南大洋崎岖地形上增强的湍流混合非常强烈和广泛。在超过 500 至 1000 米深度、距离 2000 至 3000 公里的复杂测深中，混合率超过背景值 10 至 1000 倍是常见的。这表明，南大洋的湍流混合可能对驱动水的向上输送、关闭海洋经向翻转环流做出了至关重要的贡献，因此需要在全球海洋环流和生物地球化学示踪剂扩散的数值模拟中得到体现。
Observations of internal wave velocity fluctuations show that enhanced turbulent mixing over rough topography in the Southern Ocean is remarkably intense and widespread. Mixing rates exceeding background values by a factor of 10 to 1000 are common above complex bathymetry over a distance of 2000 to 3000 kilometers at depths greater than 500 to 1000 meters. This suggests that turbulent mixing in the Southern Ocean may contribute crucially to driving the upward transport of water closing the ocean's meridional overturning circulation, and thus needs to be represented in numerical simulations of the global ocean circulation and the spreading of biogeochemical tracers.