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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/F012403/1
负责人：
Vasyl Vlasenko
金额：
$ 17.44万
依托单位：
Plymouth University
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%2FF012403%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，其中温暖的盐水在近/表层向北流动，而冷的淡水在深处向西南返回。这种环流的强度和变化被认为对北方欧洲的气候有重大影响。沿着由格陵兰苏格兰海岭构成的地形屏障，都发现了冷而稠密的底层水的重要出口通道，格陵兰苏格兰海岭的东段（冰岛和苏格兰之间）携带着大约三分之一的溢流输送到北大西洋。拟议的模拟项目将集中在溢流的一部分，这是转移超过怀维尔汤姆森岭（WTR），并最终进入罗卡尔槽。该溢流分支的气候重要性已经被NERC在现场建立的实地监测计划所认识。将开发一套数学和实验室模型，以支持监测活动，从而了解导致WTR流量泄漏的过程以及溢流穿过WTR并到达罗科尔槽时所采取的路径。此外，这些模型将量化在不同外部条件下洋脊不同部分密集底层水溢出的相对通量，并将探讨溢出在何种条件下是偶发性的。地形控制之间的耦合（i）溢出泄漏的山脊和（ii）在相邻的Wyville汤姆森盆地的主要溢流运输是至关重要的解决上述问题，这将得到特别注意的建模研究。负责的过程中的变化怀维尔汤姆森岭溢出将划定和混合与最后级联下降的底层水到罗卡尔槽将测量范围广泛的条件。这些模型的区域大小各不相同，从区域尺度（模拟大部分法罗群岛海峡系统的溢流特性）到小尺度（研究级联流的详细结构及其与上覆较暖沃茨的混合）。研究的一个重要方面是建模调查和现场数据之间的相互作用，前者的预测为后者的分析和监测业务的未来发展提供了信息。