Mixing in the Indonesian Throughflow: Analysis of Lagrangian observations of shear, watermass modification, and internal wave climates

印度尼西亚贯穿流中的混合：拉格朗日切变观测、水团修改和内波气候的分析

• 批准号: 2219987
• 负责人: James Girton
• 金额: $ 48.28万
• 依托单位: University of Washington
• 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 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2219987&HistoricalAwards=false
• 关键词: Mixing; Indonesian; Throughflow; Analysis; Lagrangian

Recent computer simulations have suggested the appearance of tides at the interfaces between different layers (internal tides) in the basins and straits of the Indonesian and Philippine Archipelagos (the Coral Triangle), with subsequent mixing of the layers. These tides carry and transform waters from the Pacific on their path to the Indian Ocean. Despite the computer-generated results, direct measurements of internal tides and mixing have been scarce in this region. This project will use Lagrangian (i.e., following the horizontal flow pathway) measurements of temperature, salinity, and currents from vertically profiling floats to investigate the levels of internal waves, especially internal tides, and their role in transforming water properties through vertical mixing. The project will use existing data from the Philippines Archipelago, along with additional new float deployments in the separately funded (NSF) "Measuring and Modeling the INdonesian Throughflow International Experiment" (MINTIE). Results will be used to evaluate the internal tide and circulation characteristics of computer models being used in the region. The project will support an international (US–Australia) collaboration and facilitate the broader use of electromagnetic velocity profiler data by providing raw profiles and derived internal wave and mixing products through national data centers. The project will furnish project material for undergraduate interns in a new APL-UW program targeting minorities.Mixing along the Pacific-to-Indian Ocean throughflow pathway is a key water mass transformation step in the global thermohaline circulation and has a first-order influence on sea-surface temperature and air–sea interaction. The locations of predicted internal tide generation are very likely to be mixing hot spots, but it remains an open question where and how the radiated internal tide energy is dissipated. This proposal will test the dominance of internal tides as mixing agents. The results will be used to evaluate the internal tide and circulation characteristics of numerical models being used to test throughflow sensitivity to the level and distribution of mixing in the region. Project's goals include: 1) the description of internal tide amplitude and radiation patterns in both the Philippine and Indonesian Seas to verify sources, diurnal and semidiurnal contributions (including the spring/neap cycle of each), and vertical wavenumber structure; 2) constraining the parameters appropriate to internal tide parameterizations, especially the fraction of energy radiated and the vertical structure of the resulting dissipation; 3) evaluation of along-path water mass transformation rates; 4) establishing a shared and publicly available database for EM-APEX profiles, of use for research studies like this one and ocean state and forecast systems assimilating stratification and velocity data.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.

最近的计算机模拟表明，在印尼和菲律宾群岛（珊瑚三角）的低音和战略家（珊瑚三角）之间的不同图层（内部潮汐）之间的界面出现潮汐，随后混合了层。这些潮汐带来并将水从太平洋沿着印度洋的道路转变。尽管有计算机产生的结果，但该地区的内部潮汐和混合的直接测量仍然很少。该项目将使用Lagrangian（即遵循水平流动路径）测量温度，盐度和从垂直分析浮子的电流来研究内部波的水平，尤其是内部潮汐的水平，以及它们在通过垂直混合转化水性能中的作用。该项目将使用来自菲律宾群岛的现有数据，以及单独资助的（NSF）“测量和建模印尼语遍布国际实验”（Mintie）的其他新浮动部署（Mintie）。结果将用于评估该地区使用的计算机模型的内部潮汐和循环特征。该项目将支持国际（美国 - 澳大利亚）的合作，并通过提供原始的概况，并通过国家数据中心提供原始的概况，并派生的内部浪潮和混合产品，从而促进更广泛地使用电磁速度速度。该项目将在针对少数群体的新的APL-UW计划中为本科内部的项目提供项目材料。沿太平洋到印度的海洋贯穿途径的混合是全球热盐循环中的关键水量转化步骤，并且对海上表面温度和空气相互作用产生一阶影响。预测的内部潮汐产生的位置很可能是混合热点，但它仍然是一个悬而未决的辐射内部潮汐能量以及如何消散的问题。该建议将测试内部潮汐作为混合剂的主导地位。结果将用于评估用于测试该地区混合水平和分布的数值模型的内部潮汐和循环特征。项目的目标包括：1）菲律宾和印度尼西亚海中的内部潮汐放大器和辐射模式的描述，以验证来源，昼夜和半恋爱的贡献（包括每个弹簧/neap循环）以及垂直的vavenumber结构； 2）约束适合内部潮汐参数的参数，尤其是辐射能量的比例和所得耗散的垂直结构； 3）评估沿前路的水质量转化率； 4）建立用于EM-APEX概况的共享和公开可用的数据库，用于诸如此类研究的研究以及海洋国家和预测系统，并吸收了分层和速度数据。该奖项反映了NSF的法定任务，并被基金会的智力和更广泛的影响通过评估来诚实地通过评估来诚实地支持。