Collaborative Research: Evaluating mechanisms for enhanced mixing below tropical instability waves

合作研究：评估热带不稳定波下方增强混合的机制

• 批准号: 2049145
• 负责人: James Moum
• 金额: $ 87.17万
• 依托单位: Oregon State University
• 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: 2021-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2049145&HistoricalAwards=false
• 关键词: Collaborative; Research; Evaluating; mechanisms; enhanced

This project supports an oceanographic field campaign in the tropical Pacific to make high temporal and spatial resolution measurements from moorings and ship of the oceanic velocity, density, and microstructure. Observations will be made of westward propagating oceanic fronts in the presence of Tropical Instability Waves (TIW) to better understand their influence on mixing and modulation of oceanic internal waves. The proposed work has important implications for understanding the El Nino Southern Oscillation (ENSO) and the role of the tropical oceans in climate. Education and outreach for this project will include mentoring a graduate student and postdoc, science presentations at local high schools, mentorship for Research Experience for Undergraduates (REU) interns, and participation in the Ocean Discovery Institute homework assistance program.This project addresses the dynamic processes that govern the observed modulation of internal waves, and turbulent mixing, by TIWs in the equatorial Pacific and the potential effects on heat regulation and ENSO predictability. Mechanisms to be studied include radiation of downward propagating internal waves from TIWs, modulation of the internal wave field by TIWs, and the fate of the internal waves in the presence of critical layers. The observational campaign will employ moorings, ship-mounted acoustics, ship-based profiling systems including a rapid profiling CTD (fastCTD) and a turbulence profiler (Epsilometer), and three autonomous drifting wave-powered profilers (WireWalkers). Three moorings will be deployed for a year north of the operational 140°W Tropical Atmosphere Ocean (TAO) mooring to target the seasonal cycle in the TIW modulation of internal waves and mixing.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.

该项目支持热带太平洋的海洋学实地活动，从系泊处和船舶上进行高时间和空间分辨率的测量，对存在热带不稳定波的情况下向西传播的海洋锋面进行海洋速度、密度和微观结构的观测。 TIW），以更好地了解它们对海洋内波混合和调制的影响。拟议的工作对于理解厄尔尼诺南方涛动（ENSO）和热带海洋在海洋中的作用具有重要意义。该项目的教育和推广将包括指导研究生和博士后、在当地高中进行科学演讲、指导本科生研究经验（REU）实习生以及参与海洋发现研究所的家庭作业协助计划。控制观测到的赤道太平洋 TIW 调制的内波和湍流混合的动态过程，以及对热调节和 ENSO 可预测性的潜在影响，包括向下传播内波的辐射。 TIW 的波、TIW 对内波场的调制以及存在关键层时内波的命运观测活动将采用系泊装置、船载声学系统、包括快速剖面 CTD 在内的船基剖面系统。 fastCTD）和湍流剖面仪（Epsilometer），以及三个自主漂流波浪动力剖面仪（WireWalkers）将在北部部署一年。运行 140°W 热带大气海洋 (TAO) 系泊，以 TIW 内波和混合调制中的季节性周期为目标。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查进行评估，被认为值得支持标准。