Collaborative Research: Nonlinear Wake Observations at a Kuroshio Seamount (NOKS)
合作研究:黑潮海山非线性尾流观测 (NOKS)
基本信息
- 批准号:2318951
- 负责人:
- 金额:$ 38.3万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2024
- 资助国家:美国
- 起止时间:2024-01-01 至 2025-12-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Oceanographic data collected in the lee of Hirase Seamount in Tokara Strait, south of Japan, during 2021-2022 will be analyzed to investigate strong nonlinear Kuroshio-seamount interactions and associated turbulence. The data include highly resolved observations of temperature, salinity, velocity, and turbulent dissipation measured from ship, moorings, and profiling float arrays. The data will be used to identify the dominant nonlinear terms in the momentum and buoyancy equations, quantify potential vorticity anomalies, and determine the vertical and lateral instability mechanisms responsible for energetic turbulence layers extending 20 km downstream of the seamount. Elucidating turbulence generation mechanisms, especially in nonlinear wakes, is an essential task to improve existing turbulent dissipation and mixing parameterizations, and therefore has broad implication for the energy cascade, mass and nutrient transports, and biogeochemical budgets in simulations and the ocean. This project will provide support for early-career scientist Dr. Anda Vladoiu. All APL-UW PIs are actively engaged in outreach at UW and local science centers and Seattle K-12 classrooms. Lien also actively supports the summer program for UW undergraduate students. Kunze is a Science Communication Fellow at the Pacific Science Center in Seattle, which involves four volunteer Science Spotlight activities per year, and participation in the annual Pacific Science Center-Climate Curiosity Weekend, to introduce the general public to the meridional overturning circulation and ocean turbulent mixing.Strong interactions between the Kuroshio and Hirase Seamount produce a uniquely nonlinear and turbulent regime that allows study outside the usual linear internal-wave and balanced dynamics. Four-dimensional fine- and microstructure surveys will be analyzed to investigate strong nonlinear Kuroshio-seamount interactions and associated turbulence where Rossby numbers exceed 1 and gradient Froude numbers are 𝑂(1). Shipboard ADCP, underway CTD and underway VMP radiator surveys, as well as four full-depth EM-APEX float box-arrays, provide horizontal submesoscale (~ 1 km) and vertical finescale (~ 10 m) flow structures. Two ADCP/CTD moorings provide 6-month time-series of the background flow variability and shear- unstable layers. These data will be used to (i) identify the dominant nonlinear terms in the momentum and buoyancy equations, (ii) quantify potential vorticity (PV) anomalies and (iii) determine the vertical and lateral instability mechanisms responsible for energetic turbulence layers with diapycnal diffusivities 𝐾 ∼ 10−2 m2 s−1 extending 20 km downstream of the seamount. The six-month long mooring time-series in the lee of the seamount will allow the separation of subinertial and internal-wave fluctuations to resolve possible time-space aliasing. These will generally improve understanding of nonlinear flow-topography interactions in the ocean.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.
将分析 2021 年至 2022 年在日本南部吐噶喇海峡平濑海山背风处收集的海洋学数据,以研究强非线性黑潮-海山相互作用和相关的湍流。这些数据包括对温度、盐度、速度和湍流的高分辨率观测。从船舶、系泊装置和剖面浮体阵列测量的湍流耗散数据将用于识别动量和动量中的主要非线性项。浮力方程,量化潜在的涡度异常,并确定造成海山下游 20 公里的高能湍流层的垂直和横向不稳定机制。阐明湍流产生机制,特别是非线性尾流,是改善现有湍流耗散和混合的一项重要任务。参数化,因此对模拟和海洋中的能量级联、质量和营养物传输以及生物地球化学预算具有广泛的影响。该项目将为早期职业科学家 Anda Vladoiu 博士提供支持,所有 APL-UW PI 都积极参与 UW 和当地科学中心的外展工作,西雅图 Lien 也积极支持 UW 本科生的暑期项目。 Kunze 是西雅图太平洋科学中心的科学传播研究员,每年涉及四次志愿者科学聚焦活动,并参加年度太平洋科学中心气候好奇周末,向公众介绍经向气候翻转环流和海洋湍流混合。黑潮海山和平濑海山之间的强烈相互作用产生了独特的非线性和湍流状态,允许在通常的线性内波和平衡动力学之外进行研究,以分析四维精细和微观结构调查。非线性黑潮-海山相互作用和相关湍流,其中罗斯比数超过 1,梯度弗劳德数为 𝑂(1) 船载 ADCP、正在进行的 CTD 和正在进行的 VMP。辐射器勘测以及四个全深度 EM-APEX 浮箱阵列提供水平亚中尺度(~ 1 km)和垂直细尺度(~ 10 m)流结构。两个 ADCP/CTD 系泊装置提供 6 个月的时间序列。背景流动变化和剪切不稳定层这些数据将用于(i)识别动量和浮力方程中的主要非线性项,(ii)量化位涡。 (PV) 异常和 (iii) 确定了导致海山下游 20 km 延伸 20 km 的双密扩散系数 𝐾 ∼ 10−2 m2 s−1 的高能湍流层的垂直和横向不稳定机制。海山的背风面将允许分离亚惯性波动和内波波动,以解决可能的时空混叠问题,这通常会提高对现象的理解。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。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Anda Vladoiu其他文献
Anda Vladoiu的其他文献
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{{ truncateString('Anda Vladoiu', 18)}}的其他基金
Collaborative Research: Kelvin-Helmholtz Instabilities at a Kuroshio Seamount (KHIKS)
合作研究:黑潮海山的开尔文-亥姆霍兹不稳定性 (KHIKS)
- 批准号:
2048764 - 财政年份:2021
- 资助金额:
$ 38.3万 - 项目类别:
Continuing Grant
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