Hawaii Ocean Mixing Experiment: Nearfield Program: Moorings

9819532 Levine提供资金在夏威夷海脊附近进行一项大型协调实验（HOME：夏威夷海洋混合实验），以确定地形粗糙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。这一分项目的重点是：（一）确定离源若干距离处各潮汐成分的垂直结构，并确定与正压潮汐相位锁定的部分;（二）测量潮汐对剪切、应变、理查森数和其他混合指标（如索普尺度）的贡献;（iii）确定其他能量源对混合的贡献，例如中尺度海流和高频内波;（iv）描述接近夏威夷海脊时背景内波频谱的变化;（v）研究剪切、应变、索普尺度等观测值之间的关系，以及其他近场研究者对湍流混合的直接观测。将从考艾海峡的山脊顶部开始部署三个系泊设备，并向南延伸：山脊顶部的短系泊设备、部署在约1500 m处的中深度系泊设备和4000 m处的深系泊设备。 这三个系泊装置将于2002年8月，即近场实验密集剖面分析开始之前部署，并将在三个月后恢复。 仪器将包括：多普勒电流剖面仪、温度记录仪和温度-电导率记录仪。

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.