Collaborative Research: Characterization of Langmuir Supercells in the Coastal Ocean
合作研究:沿海海洋朗缪尔超级单体的表征
基本信息
- 批准号:1756902
- 负责人:
- 金额:$ 34.24万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-06-01 至 2024-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Langmuir circulation (LC) arises from the interplay of wind forcing and wave dynamics, and consists of pairs of parallel counter-rotating vortices (or cells) oriented approximately in the direction of the wind. Over the continental shelf , where the water is shallow and relatively well-mixed, the passage of strong storms can induce large Langmuir cells, the largest of which can span the entire water column and have a strong influence on sediment re-suspension. These so-called Langmuir supercells (LS) play an important role as vectors for the transport of sediment and bioactive material on shallow shelves: their quasi-organized nature makes them more effective than bottom boundary layer shear turbulence at moving material out of the low-speed layer near bottom and into the bulk flow for lateral transport. This study will analyze existing observations from three different sites at 15, 26 and 40m depths as well as high resolution numerical simulations to determine the influence on LS of a number of factors such as large scale flows, tidal currents, less dense surface layers and misalignment between wind and wave direction. Continental shelves are biologically highly productive and LS have direct impact on processes affecting this productivity or distributing its products. Thus, it is essential that shelf models incorporate skillful parameterization of such dominant processes. This study will improve parameterizations used to account for Langmuir circulation in many coastal and regional models where the size of the domain precludes running the model at a high enough resolution to capture Langmuir circulations directly. One post-doctoral researcher, two graduate students and one undergraduate student in each summer will be trained in physical oceanography, turbulence dynamics and closures and numerical techniques. One of the students is from an underrepresented minority group.In the coastal ocean, LS has been observed under tidal and geostrophic flow components, surface heat fluxes and misaligned winds and waves serving to influence LS strength and coherency, as measured through bottom-mounted vertical-beam acoustic Doppler current profilers (VADCPs). Observation sites consist of the Rutgers LEO observatory in 15m of water at the inner shelf off the coast of southern New Jersey, the Navy's R2 tower in 26m of water at mid-shelf off the coast of Georgia, and an additional site north of Cape Hatteras in 40m of water. Analyses of the measurements at LEO and R2 have demonstrated differences in LS characteristics, with more coherent and intense LS occurring at LEO. New analysis of the Cape Hatteras data as well as large eddy simulations (LES) of LS flows closely following the VADCP measurements at the three sites will elucidate the dynamics by which tidal and geostrophic flows, surface buoyancy and misaligned wind and waves combine to affect LS and associated vertical transport. The LES will help provide key information missing from the field data sets, such as detailed velocity structure in the surface and bottom boundary layers, required to make definite conclusions regarding the roles of the various forcing mechanisms influencing the LS at the different sites. LES will be used to obtain a scaling of vertical velocity fluctuations representative of the strength of non-local vertical mixing induced by LS under the various processes affecting its strength and coherency. The scaling of vertical velocity fluctuations will be used to inform a KPP (K-profile parameterization) developed by the PI accounting for the local transport of the overall Langmuir turbulence and the non-local transport induced by the LS. The updated LS KPP will be implemented in the one-dimensional vertical water column General Ocean Turbulence Model (GOTM) for validation via comparisons with the LES and the field measurements.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.
朗缪尔环流 (LC) 源于风力和波浪动力学的相互作用,由一对大致与风向平行的反向旋转涡流(或涡流单元)组成。在大陆架上,水浅且混合相对充分,强风暴的通过可以诱发大型朗缪尔细胞,其中最大的朗缪尔细胞可以跨越整个水柱,并对沉积物重新悬浮产生强烈影响。这些所谓的朗缪尔超级细胞(LS)作为浅层沉积物和生物活性物质运输的载体发挥着重要作用:它们的准组织性质使它们比底部边界层剪切湍流更有效地将物质移出低层。靠近底部的速度层并进入散装流以进行横向运输。本研究将分析三个不同地点15、26和40m深度的现有观测结果以及高分辨率数值模拟,以确定大规模水流、潮汐流、密度较小的表层和错位等多种因素对LS的影响风向和波浪向之间。 大陆架在生物学上具有很高的生产力,而 LS 对影响这种生产力或分销其产品的流程有直接影响。因此,货架模型必须结合此类主导过程的熟练参数化。这项研究将改进许多沿海和区域模型中用于解释朗缪尔环流的参数化,这些模型中域的大小妨碍以足够高的分辨率运行模型以直接捕获朗缪尔环流。每年夏天,一名博士后研究员、两名研究生和一名本科生将接受物理海洋学、湍流动力学、闭合和数值技术方面的培训。其中一名学生来自一个代表性不足的少数群体。在沿海海洋中,在潮汐和地转流分量、表面热通量以及错位的风和波浪下观察到了 LS,这些因素影响了 LS 强度和相干性,这是通过底部安装的垂直测量仪测量的-束声多普勒电流轮廓仪(VADCP)。观测地点包括位于新泽西州南部海岸内陆架 15 m 水深的罗格斯 LEO 天文台、位于乔治亚州海岸中部陆架 26 m 水深的海军 R2 塔以及哈特拉斯角以北的另一个观测站在40m的水中。对 LEO 和 R2 测量结果的分析表明了 LS 特性的差异,LEO 处出现了更连贯和强烈的 LS。对哈特拉斯角数据的新分析以及紧随三个地点的 VADCP 测量的 LS 流的大涡模拟 (LES) 将阐明潮汐流和地转流、表面浮力以及错位风浪共同影响 LS 的动力学以及相关的垂直运输。 LES 将有助于提供现场数据集中缺失的关键信息,例如表面和底部边界层的详细速度结构,这些信息需要对影响不同地点 LS 的各种强迫机制的作用做出明确的结论。 LES 将用于获得垂直速度波动的标度,代表 LS 在影响其强度和相干性的各种过程下引起的非局部垂直混合的强度。垂直速度波动的缩放将用于通知由 PI 开发的 KPP(K 剖面参数化),该 KPP 考虑了整体 Langmuir 湍流的局部传输和 LS 引起的非局部传输。更新后的 LS KPP 将在一维垂直水柱通用海洋湍流模型 (GOTM) 中实施,通过与 LES 和现场测量进行比较进行验证。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。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Orientation of coastal-zone Langmuir cells forced by wind, wave and mean current at variable obliquity
- DOI:10.1017/jfm.2019.683
- 发表时间:2019-10
- 期刊:
- 影响因子:3.7
- 作者:K. Shrestha;W. Anderson;A. Tejada-Martínez;J. Kuehl
- 通讯作者:K. Shrestha;W. Anderson;A. Tejada-Martínez;J. Kuehl
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Andres Tejada-Martinez其他文献
Andres Tejada-Martinez的其他文献
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{{ truncateString('Andres Tejada-Martinez', 18)}}的其他基金
Collaborative Research: LES and RANS simulations of estuarine flows: Understanding and parameterizing the role of Langmuir turbulence
合作研究:河口流的 LES 和 RANS 模拟:理解和参数化 Langmuir 湍流的作用
- 批准号:
1805786 - 财政年份:2018
- 资助金额:
$ 34.24万 - 项目类别:
Standard Grant
Collaborative Research: DNS and high resolution measurements of scalar transfer across an air-water interface during inception and growth of Langmuir circulation
合作研究:朗缪尔环流起始和增长过程中空气-水界面标量传递的 DNS 和高分辨率测量
- 批准号:
1235039 - 财政年份:2012
- 资助金额:
$ 34.24万 - 项目类别:
Standard Grant
Collaborative Research: LES & Modeling of Turbulence on Shallow Shelves under Combined Langmuir, Tidal & Convective Forcing with Comparison to VADCP Observations
合作研究:LES
- 批准号:
0927054 - 财政年份:2009
- 资助金额:
$ 34.24万 - 项目类别:
Standard Grant
CAREER: Parameterizations of Langmuir Turbulence in Shallow Water
职业:浅水中朗缪尔湍流的参数化
- 批准号:
0846510 - 财政年份:2009
- 资助金额:
$ 34.24万 - 项目类别:
Standard Grant
Collaborative Research: Impact of Langmuir Circulation on Gas Transfer and Photosynthesis in the Southern Ocean: A Large Eddy Simulation Study
合作研究:朗缪尔环流对南大洋气体传输和光合作用的影响:大涡模拟研究
- 批准号:
0838988 - 财政年份:2009
- 资助金额:
$ 34.24万 - 项目类别:
Standard Grant
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