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Modelling of the Wyville Thomson Ridge overflow

威维尔·汤姆森岭溢流的建模

基本信息

批准号：
NE/F01239X/1
负责人：
Peter A Davies
金额：
$ 22.18万
依托单位：
University of Dundee
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FF01239X%2F1
关键词：
Modelling Wyville Thomson Ridge overflow

项目摘要

The exchange of water between the Nordic Seas and the North Atlantic Ocean is part of the global thermo-haline circulation in which warm, saline water flows northwards in the near/surface layers while cold fresher water returns southwestwards at depth. The strength and variability of this circulation is thought to have significant consequences for the climate of northern Europe. Important exit pathways for the cold, dense bottom water are found all along the topographic barrier presented by the Greenland Scotland Ridge - the eastern section of which (between Iceland and Scotland) carries about one third of the total overflow transport into the N Atlantic. The proposed modelling project will focus on the portion of the overflow that is diverted over the Wyville-Thomson Ridge (WTR)and eventually into the Rockall Trough. The climatic importance of this branch of the overflow is already recognised by the establishment by NERC of a field monitoring programme at the site. Sets of mathematical and laboratory models will be developed to support the monitoring activity, in order to understand the processes responsible for the leakage of flow over the WTR and the pathways taken by the overflow as it crosses the WTR and finds its way to the Rockall Trough. Furthermore, the models will quantify the relative fluxes of dense bottom water overflows at different sections of the ridge under different external conditions and will explore the conditions under which the overflow is episodic in nature. The topographic control on the coupling between (i) the overflow leakage over the ridge and (ii) the main overflow transport in the adjacent Wyville Thomson Basin is of crucial importance for the resolution of the above matters and this will receive special attention in the modelling studies. The processes responsible for variability in the Wyville Thomson Ridge overflow will be delineated and the mixing associated with the final cascading descent of bottom water into the Rockall Trough will be measured for a wide range of conditions. The models will vary in domain size, from the regional scale, in which the overflow characteristics of a large part of the Faroese Channels system will be simulated, to the small scale where the detailed structure of the cascading flow and its mixing with the overlying warmer waters will be studied. An important aspect of the research is the interplay between the modelling investigations and the field data, with the predictions of the former informing the analysis of the latter and the future development of the monitoring operations.

北欧海和北大西洋之间的水交换是全球热盐环流的一部分，在该环流中，温暖的咸水在近/表层向北流动，而较冷的淡水在深处向西南方向返回。这种环流的强度和变化性被认为对北欧的气候产生了重大影响。沿着格陵兰苏格兰山脊的地形屏障，可以找到冰冷、稠密的底层水的重要出口路径--格陵兰苏格兰山脊的东部(冰岛和苏格兰之间)承担着进入北大西洋的溢出输送总量的三分之一。拟议的建模项目将重点放在溢出的部分，该部分被改道越过Wyville-Thomson Ridge(WTR)，最终进入罗卡尔海槽。NERC在现场建立了一个现场监测方案，已经认识到这一溢流分支的气候重要性。将开发一套数学和实验室模型来支持监测活动，以了解造成WTR上的水流泄漏的过程，以及溢流穿过WTR并找到通往罗克尔槽的途径。此外，这些模型将量化在不同外部条件下海脊不同部分的致密底水溢流的相对通量，并将探索溢流具有阶段性的条件。对(I)山脊上的溢流泄漏和(Ii)邻近的Wyville Thomson盆地的主要溢流输送之间的耦合的地形控制对于解决上述问题至关重要，这将在模拟研究中受到特别关注。将描述造成怀维尔·汤姆森海脊溢流变化的过程，并将在广泛的条件下测量与底层水最终级联下降到罗卡尔海槽相关的混合。这些模式将在区域大小上有所不同，从区域尺度到小尺度，在区域尺度上将模拟大部分法罗海峡系统的溢流特性，在小尺度上将研究级联流的详细结构及其与上层较暖水的混合。研究的一个重要方面是模拟调查和实地数据之间的相互作用，前者的预测为后者的分析和监测行动的未来发展提供信息。