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

这项研究将通过有针对性的现场活动和数值研究，检验全球尺度海洋环流模式(OCM)表示内重力波、其动力学和混合的能力，并描述区域尺度上的海洋内波场。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NSF和海军研究办公室(ONR)通过国家海洋伙伴计划(NOPP)共同资助。将在巴西盆地部署系泊阵列，以量化由于有限幅度地形、近边界内波破裂以及湍流和内部波段的动量和浮力通量造成的近边界流动扭曲。作为同一领域的示踪剂释放实验的一部分而获得的现有数据和全球漂移方案的数据将被用来建立亚热带南大西洋海洋内部波场的区域统计特征。这一特征将与五个模型的层次结构进行比较：业务预报模式(HYCOM)、O(1-3)公里水平分辨率ROMS-CROCO、分辨率为50米的非静力ROMS-CROCO‘山脉尺度’模拟、逼真的大涡模拟(LES)和内波能谱的准解析频谱表示。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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.