Collaborative Research: LIDAR Studies of Lateral Dispersion in the Seasonal Pycnocline
合作研究:季节性密萝斜层横向色散的激光雷达研究
基本信息
- 批准号:0751653
- 负责人:
- 金额:$ 70.68万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2008
- 资助国家:美国
- 起止时间:2008-11-01 至 2012-10-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Intellectual Merit. Lateral stirring and mixing in the stratified ocean at scales of 30 m to 3 km are poorly understood. Yet mixing at these scales is an important aspect of marine ecology. Also, mixing at these scales must usually be parameterized in numerical models of ocean circulation and ocean biogeochemistry, since such small scales are not explicitly resolved in most models. The aim of the proposed work is to visualize and to understand the processes governing lateral stirring and mixing at these small scales. One hypothesis to test is that lateral stirring is driven by the relaxation of patches of weakly stratified water created by vertical mixing events. Another is that it is due to the combined action of vertical mixing and vertical shear in the horizontal velocities. There may also be stirring processes independent of vertical mixing. Drs. Ledwell and Sundermeyer will test these hypotheses and ideas and be prepared to formulate others on the basis of their experiments. The approach is to release patches of fluorescent dye in the stratified upper ocean off Bermuda, where the water is very clear. Rapid surveys of the evolving dye patches will be made with a scanning LIDAR (LIght Detecting and Ranging) system carried by a low-flying aircraft. Profiles made by a small boat in the patches will provide calibration data for the airborne measurements and would sample hydrographic structures of interests within the patches. The small boat will be tended by a research vessel, from which measurements will be made of inherent optical properties of the water, water velocity profiles, ambient radiation and meteorological conditions near the patches. The airborne LIDAR system will be a modification of a topographic mapping system operated by the NAVAIR Flight Facility. It will have a depth resolution of 1 m and a lateral resolution of 2 to 3 meters, and will sense dye to depths of 30 meters. Navigation and mapping of the dye patches will be relative to a set of drifting buoys with drogues set at the depth of the releases, and with GPS receivers and radio transmitters for communication with the ship, the small boat, and the aircraft. The experiments will be conducted during the month of July when the water is usually the clearest and when the wind-mixed layer is the thinnest. The releases will be between 10 and 20 meters below the surface, and each experiment will last on the order of 24 hours. The dye distribution will be inferred from sophisticated inversions of the returned signal in both the transmitted and fluoresced frequency bands. Broader Impacts. Understanding of the physical processes at work in small scale lateral mixing in the ocean will be of direct benefit to those trying to study ocean ecosystems and hence to those working to protect the health of the ocean, as well as those trying to develop numerical models of the ocean for this and a great variety of other practical purposes. We will entrain undergraduate and/or graduate students and a school teacher, through the ARMADA program, into the field work, which will be conducted during the summer break. A post doctoral fellow will be entrained for the field work and analysis. Development of the NASA LIDAR system at Wallops Flight Facility into one that can effectively see into the upper ocean, whether dye is used or not, will be a substantial addition to the research tools available to oceanographers.
智力优势。对30米至3公里尺度的分层海洋中的横向搅拌和混合知之甚少。然而,这种规模的混合是海洋生态学的一个重要方面。此外,在这些尺度上的混合通常必须在海洋环流和海洋地球化学的数值模式中参数化,因为这种小尺度在大多数模式中没有明确解决。拟议的工作的目的是可视化和了解在这些小尺度的横向搅拌和混合的过程。要检验的一个假设是,横向搅拌是由垂直混合事件产生的弱分层水的斑块的松弛驱动的。另一种是由于水平速度中的垂向混合和垂向剪切的共同作用。也可以有独立于垂直混合的搅拌过程。Ledwell和Sundermeyer博士将测试这些假设和想法,并准备在他们的实验基础上制定其他假设和想法。这种方法是在百慕大附近的分层上层海洋中释放荧光染料,那里的水非常清澈。将使用低空飞行飞机携带的扫描激光雷达(光探测和测距)系统对不断变化的染料斑块进行快速调查。由小船在小块区域中绘制的剖面图将为空中测量提供校准数据,并将对小块区域内感兴趣的水文结构进行采样。该小船将由一艘研究船照管,从该研究船上将对水的固有光学特性、水流速度分布、环境辐射和斑块附近的气象条件进行测量。机载激光雷达系统将是NAVAIR飞行设施操作的地形测绘系统的改进。它将具有1米的深度分辨率和2至3米的横向分辨率,并将感测30米深度的染料。染料斑的导航和绘图将相对于一组漂流浮标,浮标在释放的深度处设置有浮标,并带有GPS接收器和无线电发射器,用于与船舶、小船和飞机通信。实验将在7月份进行,那时水通常是最清澈的,风混合层也是最薄的。释放将在地表以下10至20米处进行,每次实验将持续24小时。染料分布将从发射频带和荧光频带中返回信号的复杂反转来推断。更广泛的影响。了解海洋中小尺度横向混合的物理过程将直接有益于那些试图研究海洋生态系统的人,从而有益于那些致力于保护海洋健康的人,以及那些试图为此目的和其他各种实际目的开发海洋数值模型的人。我们将通过阿尔马达计划,将本科生和/或研究生以及一名学校教师带入将在暑假期间进行的实地工作。一名博士后研究员将被安排进行实地工作和分析。将美国航天局沃洛普斯飞行设施的激光雷达系统发展成一个无论是否使用染料都能有效观测上层海洋的系统,将大大增加海洋学家可用的研究工具。
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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James Ledwell其他文献
James Ledwell的其他文献
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{{ truncateString('James Ledwell', 18)}}的其他基金
Collaborative Research: Deep Circulation over the Flanks of a Mid-Ocean Ridge
合作研究:大洋中脊两侧的深层环流
- 批准号:
1736208 - 财政年份:2017
- 资助金额:
$ 70.68万 - 项目类别:
Standard Grant
Studies of Turbulence and Mixing in the Antarctic Circumpolar Current, a Continuation of DIMES
南极绕极流湍流和混合的研究,DIMES 的延续
- 批准号:
1232962 - 财政年份:2012
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
Collaborative Research: DIMES, Diapycnal and Isopycnal Mixing in the Southern Ocean
合作研究:南大洋的 DIMES、双重和等重混合
- 批准号:
0622825 - 财政年份:2007
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
A Salt Finger Tracer Release Experiment - Analysis
盐指示踪剂释放实验 - 分析
- 批准号:
0350743 - 财政年份:2004
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
Collaborative Research: Development of SF5CF3 for Ocean Tracer Release Experiments
合作研究:开发用于海洋示踪剂释放实验的 SF5CF3
- 批准号:
0425197 - 财政年份:2004
- 资助金额:
$ 70.68万 - 项目类别:
Standard Grant
SGER: Exploration of a Tracer Patch in the Tropical Atlantic and Caribbean Sea
SGER:热带大西洋和加勒比海示踪斑块的探索
- 批准号:
0244256 - 财政年份:2002
- 资助金额:
$ 70.68万 - 项目类别:
Standard Grant
A Tracer Release Experiment in the Brazil Basin
巴西盆地示踪剂释放实验
- 批准号:
9906685 - 财政年份:1999
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
US GLOBEC: Investigation of Wate-Mass Exchange Across the Tidal Mixing Front over Southern Georges Bank and Its Impact on Larval Fish and Zooplankton Populations
美国 GLOBEC:调查南乔治滩潮汐混合锋线上的水质量交换及其对幼鱼和浮游动物种群的影响
- 批准号:
9806498 - 财政年份:1998
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
A Tracer Release Experiment in the Brazil Basin
巴西盆地示踪剂释放实验
- 批准号:
9415598 - 财政年份:1995
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
A Tracer Release Experiment in the North Atlantic
北大西洋示踪剂释放实验
- 批准号:
9020492 - 财政年份:1990
- 资助金额:
$ 70.68万 - 项目类别:
Continuing Grant
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