Opening the window to the Southern Ocean: The role of jet dynamics.
Opening the window to the Southern Ocean: The role of jet dynamics.
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DOI：
10.1126/sciadv.aao4719
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发表时间：
2018-10
期刊：
影响因子：
13.6
通讯作者：
Klocker A
中科院分区：
文献类型：
--
作者：
Klocker A
喷气动力在南大洋通风中起着至关重要的作用。南大洋的地表水起到了一个控制阀的作用，通过它，热、淡水和二氧化碳等对气候至关重要的示踪剂在大气和海洋之间转移。将这些示踪剂通过表面混合层输送到海洋内部的过程被称为海洋通风。人们认为，海洋通风的变化对于最后一次冰期期间海洋全球翻转环流的快速转变以及由于人为气候变化导致的多余热量和二氧化碳的吸收和储存都很重要。我展示了南大洋喷流、地形特征和海洋分层之间的相互作用如何导致南大洋通风作为风应力的函数的快速变化。对于增加的风，这种相互作用导致示踪剂从局限于表面混合层的状态到示踪剂充满海洋内部的状态。当风速足够大时，喷射动力会突然发生变化，从而使示踪剂能够在南大洋中部的一个被称为南极中间水的水团中通风。南极中层水通气的突变在地球过去的快速气候转变中发挥了重要作用，结合本文提出的结果，这表明喷气动力可能在促进甚至触发全球气候系统的快速转变中发挥了突出作用。
Jet dynamics play a crucial role in Southern Ocean ventilation. The surface waters of the Southern Ocean act as a control valve through which climatically important tracers such as heat, freshwater, and CO2 are transferred between the atmosphere and the ocean. The process that transports these tracers through the surface mixed layer into the ocean interior is known as ocean ventilation. Changes in ocean ventilation are thought to be important for both rapid transitions of the ocean’s global overturning circulation during the last deglaciation and the uptake and storage of excess heat and CO2 as a consequence of anthropogenic climate change. I show how the interaction between Southern Ocean jets, topographic features, and ocean stratification can lead to rapid changes in Southern Ocean ventilation as a function of wind stress. For increasing winds, this interaction leads from a state in which tracers are confined to the surface mixed layer to a state in which tracers fill the ocean interior. For sufficiently high winds, the jet dynamics abruptly change, allowing the tracer to ventilate a water mass known as Antarctic Intermediate Water in the mid-depth Southern Ocean. Abrupt changes in Antarctic Intermediate Water ventilation have played a major role in rapid climate transitions in Earth’s past, and combined with the results presented here, this would suggest that jet dynamics could play a prominent role in contributing to, or even triggering, rapid transitions of the global climate system.
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影响因子：
3.5
作者：
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通讯作者：
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作者：
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通讯作者：
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