Hawaiian Ocean Mixing Experiment: Nearfield: SeaSoar/LAMP Operations

一项大型协调实验（HOME：夏威夷海洋混合实验）正在夏威夷海岭附近进行，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量途径，并实现该区域的大致能量收支。HOME项目的近场实验侧重于研究夏威夷海岭附近的动力过程，特别是对正压潮汐强迫的响应，包括低模态和高模态内波的产生、传播和湍流耗散和混合。本子项目将重点量化平流的作用，并测量切变、分层和消散的演变，特别是在近海方向。两个仪器系统，SeaSoar和LAMP（长期自主微观结构分析器）将被部署来进行上层海洋的调查。SeaSoar是一种拖曳车辆，能够在水面和400米之间波动，以8节的拖曳速度每3公里完成一个周期。测量的变量包括温度、盐度、压力和荧光。速度和切变将用船载多普勒声纳测量。由几个长海上分支组成的重复测量将获得良好的水平和垂直分辨率和宽范围。在某种程度上，近场海星组件将围绕FLIP的详细测量结果展开。从FLIP得到的时间序列是欧拉的，因此变化将是局部的和顺行的。SeaSoar调查将解决水平结构平流经过FLIP，将其速度和密度测量置于中尺度背景下。SeaSoar的独特贡献将是能够计算需要水平分辨率和范围的统计数据。例如，通过FLIP和SeaSoar测量的结合，可以实现完整的垂直和水平波数频谱。长期自主微观结构分析器（LAMP）将增强SeaSoar的工作，这是一种自主微观结构分析器（基于SOLO），配备微观结构温度探头，Sea-Bird CTD和内部闪存卡。LAMP提供了时间分辨率和比其他方法更广泛的覆盖范围。在测量解决了当前场后，四个lamp将定期播种到测量箱中，在那里它们将漂移并最终离开该区域。他们将提供额外的热耗散速率和密度场的空间采样，以及一些远离山脊的c剖面，以帮助将近场测量置于更大的背景下。

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.