The ventilation of South Georgia's Deep Waters

南乔治亚深水区的通风

• 批准号: 1830856
• 负责人: Ricardo Matano
• 金额: $ 52.75万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-10-01 至 2021-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1830856&HistoricalAwards=false
• 关键词: ventilation; South; Georgia; Deep; Waters

This project aims to characterize the physical processes contributing to the entrainment of deep and benthic waters into the surface layers of the South Georgia Island (Southern Ocean) and to assess their sensitivity to climate variability. South Georgia (SG) hosts some of the largest chlorophyll blooms of the Southern Ocean. Observations suggest that the ocean circulation drives these blooms, but the nature of the physical processes underlying the fertilization process are unknown. A process-oriented modeling program will seek, on the one hand, to identify the sources and dynamical mechanisms underlying the fertilization of the SG region and, on the other hand, to evaluate their sensitivity to climate variability and climate change. The research is relevant to the climate and marine ecosystem community research.Understanding of SG's fertilization processes will not only contribute to the forecast of the impact of climate change on the regional ecosystems but also to anticipate the potential feedbacks that those ecosystems will have on the changing climate. Any change in the circulation in the SG, nutrient and iron input to the euphotic zone, continental margin discharge and biological activity will have a substantial effect on the balance of outgassing of natural CO2 and uptake of anthropogenic CO2. Furthermore, this study will provide some insight on which processes and on which scale the climate community model will have to resolve them. This research will also help in the design of field campaigns to address the unresolved questions of primary production in the Atlantic sector of the Southern Ocean and target sites where observations will provide answers to these questions. Graduate training will be an important component of the research.There are very few studies on the physical mechanisms sustaining SG's extraordinary blooms and, in particular, on its regional circulation. This is a matter of concern because observations suggest that South Georgia's blooms, which are an important component of the climate system, are primarily driven by physical processes. There are, for example, few studies on SG's shelf circulation and virtually none on its mass exchanges with the Southern Ocean. A pilot study, however, shows that shelf processes and its interaction with the deep ocean are critical to bio-geochemical balance of this region. The numerical experiments to be analyzed by this project are the state-of-the-art for this region. It is hypothesized that SG high productivity is based on vigorous water exchange between the shelf and the deep ocean and a persistent, albeit still under-appreciated, coastal upwelling system. Further, it is posited that SG fertilization is strongly dependent on wind forcing and the expected strengthening of the SO winds will also amplify the fertilization processes leading, therefore, to a negative feedback for climate change.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目旨在表征有助于将深水和底栖水域夹带到南佐治亚州（南大洋）地面层的物理过程，并评估其对气候变异性的敏感性。南乔治亚州（SG）举办了一些最大的南大洋叶绿素开花。观察结果表明，海洋循环驱动了这些花朵，但是受精过程基础的物理过程的性质尚不清楚。一方面，以过程为导向的建模程序将寻求确定SG区域受精的基础的来源和动力学机制，另一方面，以评估其对气候变化和气候变化的敏感性。这项研究与气候和海洋生态系统社区研究有关。理解SG的受精过程不仅将有助于预测气候变化对区域生态系统的影响，而且还可以预见这些生态系统将对气候变化的潜在反馈。 SG循环，营养和铁的输入到舒适区，大陆边缘放电和生物学活性的任何变化都将对自然二氧化碳的平衡和人为二氧化碳的吸收的平衡产生重大影响。此外，这项研究将提供一些见解，了解哪些过程以及在哪些规模的气候社区模型必须解决它们。这项研究还将有助于设计现场运动，以解决南洋大西洋地区未解决的初级生产问题，并在目标地点为这些问题提供答案。研究生培训将是研究的重要组成部分。很少有关于维持SG非凡花朵的物理机制，尤其是在其区域循环方面的研究。这是一个问题，因为观察结果表明，南乔治亚的盛开是气候系统的重要组成部分，主要是由物理过程驱动的。例如，很少有关于SG的架子循环的研究，几乎没有与南大洋进行大规模交流。但是，一项试点研究表明，货架过程及其与深海的相互作用对于该地区的生物地球化学平衡至关重要。该项目要分析的数值实验是该区域的最先进。假设SG的高生产率是基于货架和深海之间的大量水交换，尽管沿海沿海上升流的系统仍然持久，但仍持续不足。此外，人们认为，SG受精在很大程度上取决于风力强迫，预期的SO风也将扩大导致的施肥过程，从而导致了对气候变化的负面反馈。该奖项反映了NSF的法定任务，并通过使用基金会的知识优点和广泛的影响来评估NSF的法定任务，并被认为是值得的。

项目成果

Climate Change Impacts on the Patagonian Shelf Break Front

• DOI: 10.1029/2021gl096513
• 发表时间: 2022-02
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: B. Franco;L. Ruiz-Etcheverry;M. Marrari;A. Piola;R. Matano

Circulation and Cross‐Shelf Exchanges in the Northern Shelf Region of the Southwestern Atlantic: Kinematics

西南大西洋北陆架区域的环流和跨陆架交换：运动学

• DOI: 10.1029/2020jc016959
• 发表时间: 2021
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Combes, Vincent;Matano, Ricardo P.;Palma, Elbio D.
• 通讯作者: Palma, Elbio D.

The Burdwood Bank Circulation

伯德伍德银行流通

• DOI: 10.1029/2019jc015001
• 发表时间: 2019
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Matano, Ricardo P.;Palma, Elbio D.;Combes, Vincent
• 通讯作者: Combes, Vincent

Circulation and cross-shelf exchanges in the Malvinas Islands Shelf region

马尔维纳斯群岛陆架区域的流通和跨大陆架交换

• DOI: 10.1016/j.pocean.2021.102666
• 发表时间: 2021
• 期刊: Progress in Oceanography
• 影响因子: 4.1
• 作者: Palma, Elbio D.;Matano, Ricardo P.;Combes, Vincent
• 通讯作者: Combes, Vincent

Assessment of larval connectivity in a sandy beach mole crab through a coupled bio-oceanographic model

通过耦合生物海洋学模型评估沙滩鼹鼠蟹幼虫的连通性

• DOI: 10.1016/j.ecss.2020.107035
• 发表时间: 2020
• 期刊: Coastal and Shelf Science
• 作者: Meerhoff, Erika;Defeo, Omar;Combes, Vincent;Franco, Barbara C.;Matano, Ricardo P.;Piola, Alberto R.;Vaca, Freddy Hernández;Celentano, Eleonora
• 通讯作者: Celentano, Eleonora