Dense waters of the Weddell and Scotia Seas: recent changes in properties and circulation.
Dense waters of the Weddell and Scotia Seas: recent changes in properties and circulation.
复制标题
威德尔海和斯科舍海的稠密水域：性质和环流的最新变化。
DOI：
10.1098/rsta.2013.0041
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Meredith MP
中科院分区：
文献类型：
--
作者：
Meredith MP
大西洋翻转环流中的淡水沃茨发源于南极洲外围，特别是威德尔海，并通过涉及穿越斯科舍弧复杂水深的路线向北流动。最近观察到，这些沃茨沿着大西洋大部分地区显著变暖，这突出表明有必要查明和了解随时间变化的形成和输出过程，以及对其性质和流动的控制。在这里，我们回顾了最近的发展，了解的过程中，控制不断变化的水通量通过主要出口路线从威德尔海到斯科舍海，和水域内的斯科舍海和周围沃茨的转变。我们还提出了一个概要的最近的研究结果，涉及到密集的水属性的气候变化威德尔海本身，在已知的南极尺度变化的背景下。其中最重要的发现是，威德尔海输出的沃茨变暖的同时，还伴随着显著的淡水化，而且流入斯科舍海的溢流的偶发性质明显受风的控制，可导致深海分层现象显著增强。重点未来的研究工作的关键领域进行了概述。
The densest waters in the Atlantic overturning circulation are sourced at the periphery of Antarctica, especially the Weddell Sea, and flow northward via routes that involve crossing the complex bathymetry of the Scotia Arc. Recent observations of significant warming of these waters along much of the length of the Atlantic have highlighted the need to identify and understand the time-varying formation and export processes, and the controls on their properties and flows. Here, we review recent developments in understanding of the processes that control the changing flux of water through the main export route from the Weddell Sea into the Scotia Sea, and the transformations of the waters within the Scotia Sea and environs. We also present a synopsis of recent findings that relate to the climatic change of dense water properties within the Weddell Sea itself, in the context of known Atlantic-scale changes. Among the most significant findings are the discovery that the warming of waters exported from the Weddell Sea has been accompanied by a significant freshening, and that the episodic nature of the overflow into the Scotia Sea is markedly wind-controlled and can lead to significantly enhanced abyssal stratification. Key areas for focusing future research effort are outlined.