Collaborative Research: Cold Tongue Mixing

合作研究：冷舌混合

• 批准号: 2048631
• 负责人: James Moum
• 金额: $ 210.6万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2048631&HistoricalAwards=false
• 关键词: Collaborative; Research; Cold; Tongue; Mixing

This project will examine temporal and spatial variability of diapycnal mixing of heat within the oceanic cold tongues of the Atlantic and Pacific oceans through multi-year time series measurements of dissipation of temperature variance, and through post-analysis of high temporal and spatial resolution ocean models. Temperature variance dissipation is measured using ChiPods, instruments developed by PI's lab at OSU that make high-frequency turbulence measurements to derive key parameters of ocean mixing. The Chipods will be deployed on moorings in the equatorial Pacific and Atlantic oceans where they will make continuous measurements of turbulence over four years. The project includes two early career scientists and educational components at the undergraduate student level both in basic engineering construction and through a new program aimed at increasing racial and ethnic diversity in ocean sciences through an experiential learning activity targeting US and West African undergraduates.The cold tongues of the equatorial Atlantic and Pacific Oceans stand out as regions of cool tropical sea surface temperatures that take up anomalously large amounts of heat. Shear-driven turbulence moves heat well below the mixed layer and away from the surface. The rate of diathermal heat transport is determined by mixing, which can be measured directly using ChiPods deployed on moorings. The proposed work focuses on resolving long-term mixing signals in the equatorial cold tongues. This will allow evaluation of the role of mixing in interannual to decadal-scale processes, help determine the extent to which mixing influenced the Pacific cold tongue’s heat uptake during the warming hiatus, quantify how much heat is fluxed down to the deeper ocean, and quantify related model biases. ChiPods will be deployed at three equatorial mooring sites, two in the Atlantic and one in the Pacific. Analyses will be aimed at better understand intermittency of turbulence and its effect on seasonal, interannual and longer-term variations in vertical turbulent heat flux, particularly associated with tropical instability waves.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.

该项目将通过多年时间序列的温度差异测量，以及通过对高临时分辨率和空间分辨率海洋模型的分析，检查大西洋和太平洋海洋冷舌中热量的临时和空间变化。使用Chipods（由Pi's Lab在OSU开发的仪器）测量温度差异，该仪器进行了高频湍流测量，从而得出了海洋混合的关键参数。 chipods将部署在太平洋和大西洋等效的系泊设备上，在那里它们将在四年内连续测量湍流。该项目包括基本工程建设的本科生层面的两名早期职业科学家和教育成分，以及通过一项新计划，旨在通过针对我们和西非本科生的专家学习活动来增加赛车和种族多样性。剪切驱动的湍流在混合层以下并远离表面的热量移动。通过混合来确定透明热传输的速率，可以使用在系泊设备上部署的chipods进行测量。拟议的工作着重于解决等效性冷舌中的长期混合信号。这将允许评估混合在年际至际阶段过程中的作用，有助于确定混合在变暖中的混合影响到太平洋冷舌的热量吸收程度，量化多少热量倒入更深的海洋，并量化相关模型偏见。 Chipods将部署在三个等效系泊站点，两个位于大西洋，一个在太平洋。分析将旨在更好地了解湍流的间歇性及其对垂直动荡热通量的季节性，年际和长期变化的影响，尤其是与热带不稳定性波浪有关的。该奖项反映了NSF的法定任务，并通过评估该基金会的智力功能和广泛的影响来评估NSF的法定任务。

项目成果

Simulation and Scaling of the Turbulent Vertical Heat Transport and Deep-Cycle Turbulence across the Equatorial Pacific Cold Tongue

赤道太平洋冷舌湍流垂直热传输和深循环湍流的模拟和缩放

• DOI: 10.1175/jpo-d-21-0153.1
• 发表时间: 2022
• 期刊: Journal of Physical Oceanography
• 影响因子: 3.5
• 作者: Whitt, D. B.;Cherian, D. A.;Holmes, R. M.;Bachman, S. D.;Lien, R.-C.;Large, W. G.;Moum, J. N.
• 通讯作者: Moum, J. N.

Tropical Instability Waves and Wind‐Forced Cross‐Equatorial Flow in the Central Atlantic Ocean

• DOI: 10.1029/2022gl099325
• 发表时间: 2022-09
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: F. Heukamp;P Brandt;M. Dengler;F. Tuchen;M. Mcphaden;J. Moum