EMC Experiment: Examining the Fate of the East Madagascar Current
EMC 实验:检验马达加斯加东部洋流的命运
基本信息
- 批准号:2122964
- 负责人:
- 金额:$ 195.93万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-10-01 至 2025-09-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).The system of ocean currents that forms the global Meridional Overturning Circulation (GMOC) plays a central role in regulating Earth's climate. One of the least understood yet critical aspects of this system is the upper-layer circulation within the East Madagascar Current (EMC) in the South Indian Ocean. This project will use surface drifters, subsurface RAFOS floats and particle tracking in a numerical model of the region to examine pathways after the EMC separates from the continental shelf near the southern tip of Madagascar: whether it turns east into the Madagascar Basin or west into the Mozambique Basin, or both. The project will take advantage of several RAFOS sound sources associated with the already-funded Deep Madagascar Basin project (NSF/OCE/PO #1924431), adding one additional sound source to facilitate triangulation of the mid-depth RAFOS floats of the new project. The project will provide observations in an under sampled ocean region, help define the fate of Indonesian Throughflow (ITF) waters, and may inform understanding of the as yet unexplained Southeast Madagascar Bloom -- a global 'hotspot' for primary production in an otherwise oligotrophic subtropical region. The project will support the PI, an early career investigator, and fund the participation of six early-career Malagasy scientists (including a collaborator) in the research cruises. The project will also organize a 2-week summer school in Madagascar. Undergraduate WHOI summer interns will be supported each summer, including funding for their participation in scientific meetings. The proposed research will be a US contribution to the 2nd International Indian Ocean Expedition. To observe fluid parcel pathways of the detached EMC, the project will simultaneously release surface drifters and subsurface acoustically-tracked isopycnal RAFOS floats within the EMC four times over a year. This Lagrangian experiment, the first of its kind in the EMC, will be paired with particle tracking simulations to investigate surface and subsurface pathways associated with the detached EMC, its connectivity with the Agulhas Current and the South Indian Countercurrent, and respective transit times. The research will assess the impacts of EMC strength, downstream propagating eddies, and seafloor topography on the detached EMC pathways. The specific objectives are to 1) determine the advective pathways and transit times of the EMC extension at surface and pycnocline levels and investigate the physical mechanisms that control those pathways, 2) characterize the evolution of any EMC-originated eddies that transit westward, 3) evaluate potential EMC retroflection modes and investigate controls on them, and 4) determine the fates and advective transit times of EMC originated parcels following measured and modeled potential paths. This knowledge will inform understanding the ITF water journey within the South Indian Ocean, the Southeast Madagascar Bloom development, southern Madagascar coastal upwelling cells, and impacts on the Agulhas Current and the GMOC.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.
该奖项全部或部分由2021年美国救援计划法案(公法117-2)资助。形成全球经向翻转环流(GMOC)的洋流系统在调节地球气候方面发挥着核心作用。对该系统了解最少但最重要的方面之一是南印度洋东马达加斯加海流(EMC)内的上层环流。该项目将在该地区的数值模型中使用表面漂移器、地下RAFOS浮标和粒子跟踪,以研究EMC从马达加斯加南端附近的大陆架分离后的路径:它是向东进入马达加斯加盆地,还是向西进入莫桑比克盆地,或者两者兼而有之。 该项目将利用与已获资助的马达加斯加深海盆地项目(NSF/OCE/PO #1924431)有关的几个RAFOS声源,增加一个额外的声源,以便于对新项目的中深度RAFOS浮标进行三角测量。 该项目将在采样不足的海洋区域提供观测,帮助确定印度尼西亚洋流(ITF)沃茨的命运,并可能了解尚未解释的马达加斯加东南部水华-一个全球性的“热点”,在其他贫营养亚热带地区的初级生产。该项目将支持PI,一个早期职业调查员,并资助六名早期职业马达加斯加科学家(包括一名合作者)参加研究巡航。该项目还将在马达加斯加组织为期两周的暑期学校。WHOI的本科生暑期实习生每年夏天都将得到支持,包括资助他们参加科学会议。这项研究将是美国对第二次国际印度洋考察的贡献。为了观察分离的EMC的流体包裹路径,该项目将在一年内四次同时释放EMC内的表面漂流物和地下声学跟踪等密度RAFOS浮子。这个拉格朗日实验是EMC中的第一个此类实验,将与粒子跟踪模拟相结合,以研究与分离的EMC相关的表面和地下路径,其与Agulhas Current和南印度逆流的连通性以及各自的过境时间。该研究将评估EMC强度、下游传播涡流和海底地形对分离EMC路径的影响。具体目标是:1)确定地表和密度跃层水平EMC延伸的平流路径和过境时间,并调查控制这些路径的物理机制,2)表征向西过境的任何EMC起源的涡旋的演变,3)评估潜在的EMC回射模式,并调查对它们的控制,以及4)确定EMC起源的包裹遵循测量的和建模的潜在路径的命运和平流通过时间。这些知识将有助于了解ITF在南印度洋内的水之旅、马达加斯加东南部水华的发展、马达加斯加南部沿海上升流单元以及对Agulhas海流和GMOC的影响。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Viviane Vasconcellos de Menezes其他文献
Viviane Vasconcellos de Menezes的其他文献
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{{ truncateString('Viviane Vasconcellos de Menezes', 18)}}的其他基金
Collaborative Research: Deep Madagascar Basin (DMB) Experiment: A Quest to Find the Abyssal Water Pathways in the Southwest Indian Ocean
合作研究:马达加斯加深盆地 (DMB) 实验:寻找西南印度洋深海水道的探索
- 批准号:
1924431 - 财政年份:2019
- 资助金额:
$ 195.93万 - 项目类别:
Standard Grant
Inter-hemispheric Water Exchange in the Indian Ocean: Discovering the Red Sea Overflow Water Pathways and Variability
印度洋半球间水交换:发现红海溢流水路和变化
- 批准号:
1736823 - 财政年份:2017
- 资助金额:
$ 195.93万 - 项目类别:
Standard Grant
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