Mixing in the open ocean from the Last Glacial Maximum to present date: tidal dissipation and ocean resonance

从末次盛冰期至今的开放海洋中的混合：潮汐消散和海洋共振

• 批准号: NE/F014821/1
• 负责人: Mattias Green
• 金额: $ 48.17万
• 依托单位: Bangor University
• 依托单位国家: 英国
• 项目类别: Fellowship
• 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%2FF014821%2F1
• 关键词: Mixing; open; ocean; Last; Glacial

Summary Vertical mixing in the ocean causes a vertical transport of water, and with it nutrients, salt, heat and pollutants. It is also one of the main mechanisms behind the large scale ocean circulation, and therefore of immense importance for the climate of our planet. The driving force of the vertical mixing in the deep parts of the open ocean, far away from coasts and the wind-mixed upper kilometre of the water column, is the tide. In order to understand and be able to predict changes in climate, we must look back in time and try to understand, explain and quantify previous changes in climate. In the past 21 000 years, since the Last Glacial Maximum (LGM), the sea level has risen by 115-135 m. A major consequence of this sea level rise has been the flooding of the continental shelf seas. Although the massive expansion of the shelf seas has been described as the most important geological event of recent time, there has been no integrated study of the impact of this event on global ocean circulation, and only a few investigations of its impact on ocean mixing. Whilst the contemporary shelf seas only account for 7% of the surface area of the global ocean, over 70% of the tidal energy dissipation takes place there. In consequence the historical rise in sea level has had a profound effect on the dissipation of tidal energy in shelf seas. This will in turn be reflected in a change in the dissipation of tidal energy in the deep ocean. As the tide provides a major, if not the major, component of the mechanical energy which ventilates the deep ocean through turbulent mixing, the rise in sea level has had a substantial impact on the marine system. Tides therefore do not only have the potential to affect the global climate, by influencing the strength of the oceanic circulation, but they can also influence key global biogeochemical cycles and atmospheric carbon dioxide levels. Within the project we will therefore aim to improve the accuracy of the estimates of the tidally driven open ocean mixing in the historical ocean. This will be done using two computer models of the ocean tides. We will simulate the changes in the global ocean mixing rates caused by the ocean tides from the peak of the last ice-age until today, and try to explain and quantify the changes which occur. This will open for a further understanding of the forcing of our ocean circulation system in the past and today. It will also provide insight into the sensitivity of the ocean mixing system, and how it relates to climate dynamics and climate change.

摘要 海洋中的垂直混合导致水的垂直输送，以及随之而来的营养物、盐、热量和污染物。它也是大规模海洋环流背后的主要机制之一，因此对我们星球的气候至关重要。在远离海岸和风混合的水体上千米的公海深处，垂直混合的驱动力是潮汐。为了理解并能够预测气候变化，我们必须回顾过去并尝试理解、解释和量化之前的气候变化。在过去的 21 000 年间，自末次盛冰期 (LGM) 以来，海平面上升了 115-135 m。海平面上升的一个主要后果是大陆架海水泛滥。尽管陆架海的大规模扩张被认为是近年来最重要的地质事件，但目前还没有对该事件对全球海洋环流影响的综合研究，对其对海洋混合影响的研究也很少。虽然当代陆架海仅占全球海洋表面积的 7%，但超过 70% 的潮汐能耗散都发生在那里。因此，历史上海平面的上升对陆架海潮汐能的耗散产生了深远的影响。这反过来又会反映在深海潮汐能耗散的变化上。由于潮汐提供了通过湍流混合为深海通风的机械能的主要（如果不是主要）组成部分，因此海平面的上升对海洋系统产生了重大影响。因此，潮汐不仅有可能通过影响海洋环流的强度来影响全球气候，而且还可以影响关键的全球生物地球化学循环和大气二氧化碳水平。因此，在该项目中，我们的目标是提高历史海洋中潮汐驱动的开放海洋混合的估计准确性。这将使用两个海洋潮汐计算机模型来完成。我们将模拟从最后一个冰河时代的高峰期到今天由潮汐引起的全球海洋混合率的变化，并尝试解释和量化所发生的变化。这将使我们进一步了解过去和今天海洋环流系统的强迫。它还将深入了解海洋混合系统的敏感性，以及它与气候动态和气候变化的关系。

项目成果

Back to the future: Testing different scenarios for the next supercontinent gathering

• DOI: 10.1016/j.gloplacha.2018.07.015
• 发表时间: 2018-10-01
• 期刊: GLOBAL AND PLANETARY CHANGE
• 影响因子: 3.9
• 作者: Davies, Hannah S.;Green, J. A. Mattias;Duarte, Joao C.
• 通讯作者: Duarte, Joao C.

A Comparison of Tidal Conversion Parameterizations for Tidal Models

• DOI: 10.1175/jpo-d-12-023.1
• 发表时间: 2013-01-01
• 期刊: JOURNAL OF PHYSICAL OCEANOGRAPHY
• 影响因子: 3.5
• 作者: Green, J. A. Mattias;Nycander, Jonas
• 通讯作者: Nycander, Jonas

Impacts on the global ocean circulation from vertical mixing and a collapsing ice sheet

垂直混合和冰盖崩塌对全球海洋环流的影响

• DOI: 10.1357/002224011798765321
• 发表时间: 2011
• 期刊: Journal of Marine Research
• 影响因子: 0.5
• 作者: Green J

Non-assimilated tidal modeling of the South China Sea

• DOI: 10.1016/j.dsr.2013.04.006
• 发表时间: 2013-08-01
• 期刊: DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
• 影响因子: 2.4
• 作者: Green, J. A. Mattias;David, Tomos W.
• 通讯作者: David, Tomos W.

Tidal mixing and the Meridional Overturning Circulation from the Last Glacial Maximum

• DOI: 10.1029/2009gl039309
• 发表时间: 2009-08
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: J. Green;C. Green;G. Bigg;T. Rippeth;J. Scourse;Katsuto Uehara