Collaborative Research: The Internal Wave Spectrum and Boundary Mixing in the Sub-Tropical South Atlantic

该研究将通过有针对性的野外活动和数值调查，检验全球尺度海洋环流模式（ocm）表征内部重力波、其动力学和混合的能力，并在区域尺度上表征海洋内部波场。该项目将通过实地活动和有针对性的数值模拟获得新的观测结果，并将利用现有数据。该项目由美国国家科学基金会（NSF）和美国海军研究办公室（ONR）通过国家海洋学合作计划（NOPP）共同资助。一个系泊阵列将部署在巴西盆地，以量化由于有限振幅地形造成的近边界流动扭曲，近边界内波破裂，以及湍流和内波带的动量和浮力通量。作为同一区域的示踪剂释放实验的一部分获得的现有数据和全球漂流者计划的数据将用于创建亚热带南大西洋海洋内波场的区域统计特征。该特性将与五个模型的层次结构进行比较：一个业务预测模型（HYCOM）， 0（1-3）公里水平分辨率ROMS-CROCO，一个50米分辨率的非流体静力ROMS-CROCO“山地尺度”模拟，一个真实的大涡模拟（LES），以及一个内波能量谱的准解析谱表示。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。

The research will examine the capability of global scale Ocean Circulation Models (OCMs) to represent internal gravity waves, their dynamics and mixing with characterizing the oceanic internal wavefield at regional scales through a targeted field campaign and numerical investigations. The project will obtain new observations through a field campaign and targeted numerical simulations and will leverage existing data. This project is jointly funded by NSF and the Office of Naval Research (ONR) through the National Oceanographic Partnership Program (NOPP).A moored array will be deployed in the Brazil Basin to quantify near boundary flow distortions due to finite amplitude topography, near boundary internal wave breaking, and momentum and buoyancy fluxes in both turbulent and internal wavebands. Extant data obtained as part of a Tracer Release Experiment in the same domain and data from the Global Drifter Program will be used to create a regional statistical characterization of the oceanic internal wavefield in the Sub-Tropical South Atlantic. This characterization will be compared to a hierarchy of five models: an operational forecast model (HYCOM), O(1-3) km horizontal resolution ROMS-CROCO, a nonhydrostatic ROMS-CROCO ’mountain scale’ simulations with 50 m resolution, a realistic Large Eddy Simulations (LES), and a quasi-analytic spectral representation of the internal wave energy spectrum.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.