Collaborative Research: Dynamics of Cross-Shelf Plumes under Upwelling Wind Conditions

合作研究：上升风条件下跨陆架羽流的动力学

• 批准号: 2148479
• 负责人: Diane Fribance
• 金额: $ 42.05万
• 依托单位: Coastal Carolina 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: 2022-08-01 至 2026-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2148479&HistoricalAwards=false
• 关键词: Collaborative; Research; Dynamics; Cross; Shelf

The project will investigate the linkage of land-derived riverine waters with open ocean waters via 'buoyant plumes.' The project will assess the role of river discharge, tides and winds in the formation and maintenance of the buoyant plumes throughout the continental shelf. For such assessment, the project will use shipboard measurements, Autonomous Surface Vehicles, Autonomous flying vehicles (drones), and a floating platform that will be complemented by computer model simulations. The project will provide approximations of the linkage between land and open-ocean processes to be used in global-scale models. The project will also facilitate interactions between a research intensive university and an undergraduate college. It will train graduate students and provide valuable experiences to undergraduate students. This study concentrates on the dynamics of supercritical coastal buoyant plumes that expand obliquely across the shelf. These buoyant plumes transport low salinity waters across the continental shelf and can be entrained by ocean currents flowing by the shelf’s edge. The buoyant plumes are influenced by the balance between wind stress (upwelling-favorable) and buoyancy forcing. Tidal pulses of brackish water interfere with such dynamic balance to produce radial fronts referred to as sub-plumes. These sub-plumes are subsequently advected by Ekman transport. Data collection will consist of 4 seasonal surveys of Winyah Bay plume using ships (UNOLS ship requested), drones, Autonomous Surface Vehicles, and a floating platform to obtain profiles of water velocity, salinity, temperature, and turbulence properties. The sub-plume fronts shall be ubiquitous as long as the horizontal density gradient is prominent and the inertial period is greater than the tidal period. Observations will be complemented by numerical simulations with a non-hydrostatic numerical model. As Broader Impacts, the study will allow parametrization of cross-shelf plumes into lower resolution models that study land-ocean exchanges. The project will support 2 MS and 1 PhD students, and offer cruise opportunities to several undergraduate students. Data collected and their analysis will produce Ocean Data Analysis modules to be distributed to the oceanographic community. The project will be a collaboration between and R1 and a teaching institution.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.

该项目将通过“浮力羽流”研究陆地河流水域与开放海洋水域的联系。该项目将评估河流流量、潮汐和风在整个大陆架浮力羽流的形成和维持中的作用。在此类评估中，该项目将使用舰载测量、自主地面车辆、自主飞行器（无人机）和浮动平台，并辅以计算机模型模拟。该项目将提供近似值。该项目还将促进研究密集型大学和本科生学院之间的互动，并为本科生提供宝贵的经验。超临界沿海浮力羽流在大陆架上倾斜扩展，这些浮力羽流将低盐度海水输送到大陆架上，并可能受到流经陆架边缘的洋流的影响。通过风应力（有利上升流）和浮力强迫之间的平衡，干扰这种动态平衡，从而产生称为子羽流的径向锋，这些子羽流随后由埃克曼传输。包括使用船只（UNOLS 船只要求）、无人机、自主水面车辆和浮动平台对 Winyah 湾羽流进行 4 次季节性调查，以获得水速剖面，只要水平密度梯度显着并且惯性周期大于潮汐周期，子羽流锋就会普遍存在，并通过非流体静力学数值模型进行数值模拟。作为更广泛的影响，该研究将允许跨陆架羽流参数化为研究陆地-海洋交换的较低分辨率模型。该项目将支持 2 名硕士和 1 名博士。收集的数据和他们的分析将产生分发给海洋学界的海洋数据分析模块，该项目将由 R1 和教学机构合作。该奖项反映了 NSF 的法定使命。通过使用基金会的智力优点和更广泛的影响审查标准进行评估，并被认为值得支持。