Hawaiian Ocean Mixing Experiment: Nearfield: SeaSoar/LAMP Operations

夏威夷海洋混合实验：近场：SeaSoar/LAMP 操作

• 批准号: 9819530
• 负责人: Daniel Rudnick
• 金额: --
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819530&HistoricalAwards=false
• 关键词: Hawaiian; Ocean; Mixing; Experiment; Nearfield

9819530 RudnickA large coordinated experiment (HOME: Hawaiian Ocean Mixing Experiment) is underway near the Hawaiian Ridge to determine whether sites with rough topography are responsible for the mixing of the global ocean. The goals are to identify the major energy pathways for ocean mixing and achieve an approximate energy budget for the region. The Near-field experiment of the HOME project focuses on the investigation of the dynamical processes in the immediate vicinity of the Hawaiian Ridge, and especially the response to barotropic tidal forcing including generation of low- and high-mode internal waves, propagation and turbulent dissipation and mixing. This sub-project will focus on quantifying the role of advection, and measuring the evolution of shear, stratification and dissipation, especially in the off-shore direction. Two instrument systems, SeaSoar and LAMP (Long-term Autonomous Microstructure Profiler) will be deployed to conduct surveys of the upper ocean. The SeaSoar is a towed vehicle capable of undulating between the surface and 400 m, completing a cycle every 3 km at a tow speed of 8 knots. Measured variables include temperature, salinity, pressure, and fluorescence. Velocity and shear will be measured using a shipboard Doppler Sonar. Repeated surveys consisting of several long offshore legs will achieve both fine horizontal and vertical resolution and wide range. The Nearfield SeaSoar component will, to some extent, revolve around the detailed measurements from FLIP. The time series obtained from FLIP are Eulerian, so changes will be both local and advective. The SeaSoar survey will resolve the horizontal structure advecting past FLIP, placing its velocity and density measurements into mesoscale context. The unique contribution of SeaSoar will be the ability to calculate statistics that require horizontal resolution and range. For example, the complete vertical and horizontal wavenumber-frequency spectrum is realizable from the combination of FLIP and SeaSoar measurements. Augmenting the SeaSoar work will be LAMP (Long-term Autonomous Microstructure Profiler), which is an autonomous profiler (based on the SOLO) outfitted with microstructure temperature probes, a Sea-Bird CTD, and an internal flash card. LAMP provides both temporal resolution and broader coverage than otherwise possible. After the survey resolves the current field, four LAMPs will be periodically seeded into the survey box where they will drift through and eventually out of the region. They will provide additional spatial sampling of the thermal dissipation c rates and the density field, as well as some profiles of c further off the ridge to help place the Nearfield measurements into a larger context.

9819530 Rudnick一项大型协调实验（HOME：夏威夷海洋混合实验）正在夏威夷海脊附近进行，以确定地形粗糙的地点是否是全球海洋混合的原因。目标是确定海洋混合的主要能源途径，并为该区域实现大致的能源预算。HOME项目的近场实验侧重于研究夏威夷海脊附近的动力过程，特别是正压潮汐强迫的响应，包括低模和高模内波的产生、传播和湍流耗散与混合。这个分项目将侧重于量化平流的作用，并测量剪切、分层和耗散的演变，特别是在离岸方向。将部署两个仪器系统，SeaSoar和LAMP（长期自主微结构剖面仪），对上层海洋进行调查。SeaSoar是一种能够在水面和400米之间起伏的拖曳车辆，以8节的拖曳速度每3公里完成一个循环。测量的变量包括温度、盐度、压力和荧光。速度和剪切力将使用船上多普勒声纳测量。由几个长的海上航段组成的重复测量将实现精细的水平和垂直分辨率以及宽范围。近场SeaSoar组件将在某种程度上围绕FLIP的详细测量。从FLIP获得的时间序列是欧拉的，因此变化将是局部的和平流的。SeaSoar调查将解决通过FLIP平流的水平结构，将其速度和密度测量置于中尺度环境中。SeaSoar的独特贡献将是计算需要水平分辨率和范围的统计数据的能力。例如，通过FLIP和SeaSoar测量的组合，可以实现完整的垂直和水平波数频谱。增强SeaSoar工作的将是LAMP（长期自主微结构剖面仪），这是一个自主剖面仪（基于SOLO），配备了微结构温度探头，海鸟CTD和内部闪存卡。LAMP提供了时间分辨率和比其他方式更广泛的覆盖范围。在勘测解决当前字段后，四个LAMP将定期被播种到勘测框中，它们将漂移通过并最终离开该区域。它们将提供热耗散c率和密度场的额外空间采样，以及远离山脊的c的一些剖面，以帮助将近场测量置于更大的背景中。