Investigating ocean stratification changes with global warming by long-range internal tides

通过远程内潮汐研究全球变暖导致的海洋层化变化

• 批准号: 2149028
• 负责人: Zhongxiang Zhao
• 金额: $ 61.55万
• 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: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2149028&HistoricalAwards=false
• 关键词: Investigating; ocean; stratification; changes; global

Stratification is a key property of the ocean and plays an important role in almost all ocean processes including mass transport, vertical mixing and overturning circulation. It is of high priority to monitor its seasonal cycle, decadal trend and interannual variation on the global scale. Long-range internal tides, which attribute their existence to ocean stratification, are a natural choice for monitoring ocean stratification changes. This project will further mature a technique to accurately observe low-mode internal tides using satellite altimetry. It will not only improve our understanding of internal tide activities, but also develop a new technique for monitoring ocean stratification, providing an independent long-term, low-cost, environmentally-friendly observing system. The global ocean is subject to changes as evidenced by frequent extreme weathers such as heat waves and tropical cyclones. Besides ocean warming and sea level rise, it is well-known that stratification intensification may change large-scale ocean circulations; one extreme scenario is shown in the movie “The Day After Tomorrow.” The satellite-derived internal tide models will be useful to the oceanographic community in designing field experiments, modeling internal tides, primary productivity, ocean acoustics, coral reef bleaching, ocean mixing, and internal tide correction. The new information on ocean stratification changes will be made freely available to researchers around the globe. This project will train a graduate student at the University of Washington. The team will also make an animation to simply explain the techniques to young kids and the public.Ocean stratification plays an important role in many dynamics processes including mass transport, isopycnal mixing and meridional ocean circulation. This project will investigate ocean stratification changes using satellite altimetry, the World Ocean Atlas, Argo floats, and two numerical models ECCO and HYCOM. Its goals are to (1) construct a global network utilizing long-range internal tide beams, (2) quantify seasonal cycle, decadal trend, and interannual variation of ocean stratification in terms of internal tide speed, (3) validate the satellite-derived ocean stratification changes with in situ measurements, and (4) evaluate the performance of ECCO and HYCOM in reproducing ocean stratification.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.

分层是海洋的一个关键特性，在质量输送、垂直混合和翻转环流等几乎所有海洋过程中都发挥着重要作用，在全球范围内监测其季节周期、年代际趋势和年际变化具有重要意义。范围内潮将其存在归因于海洋层化，是监测海洋层化变化的自然选择，该项目将进一步成熟利用卫星测高精确观测低模内潮的技术，这不仅将提高我们对海洋层化的了解。内部的潮汐活动，同时还开发监测海洋层化的新技术，提供独立的长期、低成本、环保的观测系统。全球海洋经常发生热浪和热带等极端天气。除了海洋变暖和海平面上升之外，众所周知，分层强化可能会改变大规模的海洋环流；电影《后天》将展示一种极端的情况。对海洋学界在设计现场实验、模拟内潮、初级生产力、海洋声学、珊瑚礁白化、海洋混合和内潮校正方面的合作，将免费向全球研究人员提供有关海洋层化变化的新信息。该团队还将制作一个动画，向华盛顿大学培训一名研究生，向幼儿和公众简单解释这些技术。海洋分层在许多动力学过程中发挥着重要作用，包括质量传输、等重混合和经向海洋环流。这个项目将使用卫星测高、世界海洋地图集、Argo 浮标以及两个数值模型 ECCO 和 HYCOM 来研究海洋分层变化。其目标是 (1) 利用远程内潮波束构建全球网络，(2) 量化季节周期。 、年代际趋势和内潮速方面的海洋层化的年际变化，(3) 通过现场测量验证卫星衍生的海洋层化变化，以及 (4) 评估 ECCO 和 HYCOM 在该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。