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.

该项目将通过温度方差消散的多年时间序列测量以及高时空分辨率海洋模型的后期分析，研究大西洋和太平洋海洋冷舌内热量混合的时空变化。温度方差耗散是使用 ChiPod 来测量的，ChiPod 是由 PI 在 OSU 的实验室开发的仪器，可进行高频湍流测量，以获得海洋混合的关键参数。Chipod 将部署在系泊处。他们将在四年内对赤道太平洋和大西洋的湍流进行连续测量，该项目包括两名早期职业科学家和本科生教育部分，包括基础工程建设和旨在增加种族和民族的新计划。通过针对美国和西非本科生的体验式学习活动，了解海洋科学的多样性。赤道大西洋和太平洋的冷舌是热带海洋表面温度较低的区域，它们吸收了异常大量的剪切力驱动的热量。湍流将热量远低于混合层并远离地表。透​​热热传输速率由混合决定，可以使用部署在系泊处的 ChiPod 直接测量。拟议的工作重点是解决赤道地区的长期混合信号。这将有助于评估混合在年际到年代际尺度过程中的作用，帮助确定混合对变暖中断期间太平洋冷舌吸热的影响程度，量化热量的多少。流到更深的海洋，并量化相关模型偏差将部署在三个赤道系泊点，两个在大西洋，一个在太平洋，旨在更好地了解湍流的间歇性及其对季节性和年际的影响。垂直湍流热通量的长期变化，特别是与热带不稳定波相关的变化。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进行评估，被认为值得支持审查标准。

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