Shelf/Deep-Ocean Frontal Interaction in the Southwestern Atlantic

西南大西洋的陆架/深海锋面相互作用

• 批准号: 2149093
• 负责人: Ricardo Matano
• 金额: $ 48.56万
• 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: 2022
• 资助国家: 美国
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2149093&HistoricalAwards=false
• 关键词: Shelf; Deep; Ocean; Frontal; Interaction

The South Atlantic basin hosts the largest chlorophyll-a blooms of the Southern Ocean, dominance likely associated with off-shelf flows of highly fertilized waters drawn from the southwestern continental shelf region. This project will investigate the extent to which these continental shelf outflows are controlled by the interactions of two distinct western boundary currents, the Brazil and Malvinas currents, with the shelf circulation. The numerical simulations with sub-mesoscale permitting resolution will generate the most detailed description of the circulation to date. This project will also advance the characterization of the southwestern Atlantic shelf circulation through the novel use of in situ and remote observations.The goal of this project is to characterize the shelf and deep-ocean exchanges in the southwestern Atlantic region. The project will test the hypothesize that the boundary currents regulate these exchanges by injecting deep ocean waters onto the northern and southern portions of the shelf and detraining shelf waters at the frontal system. The dynamical mechanisms connecting the shelf to the deep-ocean circulation will be identified. The dominant modes of variability of the coupled system will be characterized and the influence of these modes on the mass exchanges between the shelf and the deep ocean will be investigated. The analyses will include data produced by a suite of numerical experiments along with in-situ observations and satellite data to establish confidence in the model results.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.

南大西洋海盆是南大洋叶绿素a爆发量最大的地区，其主要原因可能与从西南大陆架区域抽取的高肥力沃茨的离岸流动有关。该项目将调查这些大陆架外流在多大程度上受两个不同的西部边界海流-巴西海流和马尔维纳斯海流-与大陆架环流相互作用的控制。次中尺度分辨率允许的数值模拟将产生迄今为止最详细的环流描述。该项目还将通过新的实地和远程观测方法，推动确定西南大西洋大陆架环流的特征，目的是确定西南大西洋区域大陆架和深海交换的特征。该项目将检验这样一种假设，即边界流通过将深海沃茨注入大陆架的北方和南部，并在锋面系统排除大陆架沃茨，从而调节这些交换。将查明将大陆架与深海环流联系起来的动力机制。将描述耦合系统的主要变率模式，并研究这些模式对大陆架和深海之间物质交换的影响。分析将包括一套数值实验产生的数据沿着现场观测和卫星数据，以建立对模型结果的信心。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

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

西南大西洋北陆架的环流和跨大陆架交换：动力学

• DOI: 10.1029/2023jc019887
• 发表时间: 2023
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Combes, Vincent;Matano, Ricardo P.;Palma, Elbio D.
• 通讯作者: Palma, Elbio D.

Large-scale connectivity of the sandy beach clam Mesodesma mactroides along the Atlantic coast of South America, and climate change implications

• DOI: 10.1016/j.marenvres.2022.105591
• 发表时间: 2022-03-05
• 期刊: MARINE ENVIRONMENTAL RESEARCH
• 影响因子: 3.3
• 作者: Meerhoff，Erika;Combes，Vincent;Defeo，Omar
• 通讯作者: Defeo，Omar

Variability of the Shelf Circulation Around South Georgia, Southern Ocean

• DOI: 10.1029/2022jc019257
• 发表时间: 2023-02-01
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
• 影响因子: 3.6
• 作者: Combes，V.;Matano，R. P.;Young，E. F.
• 通讯作者: Young，E. F.

Patterns and Trends in Chlorophyll‐a Concentration and Phytoplankton Phenology in the Biogeographical Regions of Southwestern Atlantic

西南大西洋生物地理区域叶绿素浓度和浮游植物物候的模式和趋势

• DOI: 10.1029/2023jc019865
• 发表时间: 2023
• 期刊: Journal of Geophysical Research: Oceans
• 作者: Delgado, Ana L.;Hernández‐Carrasco, Ismael;Combes, Vincent;Font‐Muñoz, Joan;Pratolongo, Paula D.;Basterretxea, Gotzon
• 通讯作者: Basterretxea, Gotzon