Submesoscale and Surface Gravity Wave Interactions on the Continental Shelf

大陆架上的次介尺度和表面重力波相互作用

• 批准号: 2124174
• 负责人: Daniel Dauhajre
• 金额: $ 47.27万
• 依托单位: University of California-Los Angeles
• 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: 2022-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2124174&HistoricalAwards=false
• 关键词: Submesoscale; Surface; Gravity; Wave; Interactions

The region spanning the shoreline to the shelf-break serves as a primary connection between human activity at the land-sea interface and ecological functioning farther offshore. An arising conception is that the shelf is filled with nonlinear, 3D flow patterns that are 0.1 - 1 km in spatial scale with ephemeral lifecycles of hours to days, termed ‘submesoscale’. This project will use a multi-scale modeling approach to examine 1) wave effects on submesoscale dynamics and 2) interactions between different classes of submesoscale features. The gained physical knowledge will transform notions of nearshore transport that imprint onto pollution dispersal, coastal biogeochemical fluxes, and ecosystem functioning. New physical understanding will inform management of nearshore marine ecosystems and water-quality in recreational areas through communication with local managers. Results will be disseminated to the general public and historically underrepresented youth through coordination with the Surfrider Foundation. Research collaborations will aid in the development of an online wave-circulation model coupling; strengthen the physical oceanographic and technological framework of a multi-institutional project on the farming of giant kelp on the continental shelf; and modernize conceptions of coastal connectivity for the Long Term Ecological Research Project on giant kelp in the Santa Barbara Channel. This project explores surface gravity wave effects on- and interactions between- the variety of submesoscale coherent structures that uniquely coexist in the region spanning the shoreline to the shelfbreak, including surface layer density fronts and filaments, topographic wakes, internal tidal bores, freshwater plumes, and surfzone vortices. The primary hypotheses are: (1) surface gravity wave effects on currents can significantly modify the local circulation, material fluxes, and spatial orientation of nearshore submesoscale coherent structures and (2) the coexistence of distinct phenomena drives submesoscale interactions that manifest as (a) sporadic collisions between individual fronts or vortices and (b) competition to regulate stratification and material fluxes. Tools include a suite of high-resolution, multiply-nested ROMS simulations employing non-hydrostatic capability and realistic atmospheric, tidal, and surface wave-averaged forcing, and complementary idealized simulations to target the fundamental dynamics and parametric dependencies of these interactions.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.

从海岸线到大陆架断裂的区域是陆地-海洋界面的人类活动和更远的近海生态功能之间的主要联系。一个正在兴起的概念是，大陆架充满了非线性的三维流动模式，其空间尺度为0.1 - 1公里，生命周期为数小时至数天，称为“亚中尺度”。该项目将使用多尺度建模方法来研究1)波动对亚中尺度动力学的影响以及2)不同亚中尺度特征之间的相互作用。获得的物理知识将改变近岸运输的概念，影响污染扩散、沿海生物地球化学通量和生态系统功能。新的物理认识将通过与当地管理人员的沟通，为近岸海洋生态系统和休闲区水质的管理提供信息。结果将通过与冲浪者基金会的协调向公众和历史上代表性不足的青年传播。研究合作将有助于开发在线波循环模型耦合；加强关于在大陆架上养殖巨藻的多机构项目的物理海洋学和技术框架；并为圣巴巴拉海峡巨型海带的长期生态研究项目实现沿海连通性的现代化概念。该项目探讨了地表重力波对各种亚中尺度连贯结构的影响以及它们之间的相互作用，这些结构在跨越海岸线到大陆架断裂的区域内独特地共存，包括表层密度锋和细丝、地形尾迹、内部潮汐孔、淡水羽流和表层涡旋。主要假设是：(1)地表重力波对海流的影响可以显著改变局地环流、物质通量和近岸亚中尺度相干结构的空间取向；(2)不同现象的共存驱动亚中尺度相互作用，表现为(a)个别锋或涡之间的零星碰撞和(b)调节分层和物质通量的竞争。工具包括一套高分辨率、多重嵌套的ROMS模拟，采用非流体静力学能力和真实的大气、潮汐和表面波平均强迫，以及针对这些相互作用的基本动力学和参数依赖性的互补理想模拟。该奖项反映了美国国家科学基金会的法定使命，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。