Hawaii Ocean Mixing Experiment: Nearfield Program: Moorings

夏威夷海洋混合实验：近场项目：系泊装置

• 批准号: 9819532
• 负责人: Murray Levine
• 金额: $ 62.07万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-03-15 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819532&HistoricalAwards=false
• 关键词: Hawaii; Ocean; Mixing; Experiment; Nearfield

9819532 LevineFunding is provided to conduct a large coordinated experiment (HOME: Hawaiian Ocean Mixing Experiment) 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 (i) defining the vertical structure of the individual tidal constituents at several distances from the source and determine the portion that is phase-locked with the barotropic tide; (ii) measuring the tidal contribution to shear, strain, Richardson number, and other mixing indicators such as Thorpe scale; (iii) determining the contribution of other energy sources for mixing, such as mesoscale currents and high-frequency internal waves; (iv) describing the modification of the background internal wave spectrum as the Hawaiian Ridge is approached; and (v) studying the relationship between observations of shear, strain, Thorpe scale, etc., and the direct observations of turbulent mixing obtained by other Nearfield investigators. Three moorings will be deployed starting at the top of the Ridge in the Kauai Channel and extending to the south: a short mooring at the top of the Ridge, a mid-depth mooring deployed at about 1500m, and a deep mooring at 4000m. The three moorings will be deployed in August, 2002, just before the intensive profiling of the Nearfield experiment begins, and will be recovered three months later. The instrumentation will include: Doppler current profilers, temperature recorders, and temperature-conductivity recorders.

9819532 Levine 提供资金用于在夏威夷海脊附近进行大型协调实验（HOME：夏威夷海洋混合实验），以确定地形崎岖的地点是否对全球海洋的混合负责。目标是确定海洋混合的主要能源途径，并实现该地区的大致能源预算。 HOME项目的近场实验重点研究夏威夷海脊附近的动力学过程，特别是对正压潮汐强迫的响应，包括低模和高模内波的产生、传播和湍流耗散和混合。该子项目将重点关注（i）定义距源头若干距离处各个潮汐成分的垂直结构，并确定与正压潮汐锁相的部分； (ii) 测量潮汐对剪切、应变、理查森数和其他混合指标（例如索普尺度）的贡献； (iii) 确定其他能源对混合的贡献，例如中尺度电流和高频内波； (iv) 描述当接近夏威夷海脊时背景内波谱的变化； (v) 研究剪切、应变、索普尺度等观测结果与其他近场研究人员获得的湍流混合直接观测结果之间的关系。将从可爱岛海峡的山脊顶部开始向南部署三个系泊处：在山脊顶部的短系泊处、在约1500m处部署的中深度系泊处、以及在4000m处部署的深系泊处。 这三个系泊装置将于 2002 年 8 月，就在近场实验开始密集分析之前部署，并将在三个月后恢复。 仪器包括：多普勒电流分析仪、温度记录仪和温度电导率记录仪。