The Thermal Output of a Sea-Floor Hydrothermal System

海底热液系统的热输出

• 批准号: 9012240
• 负责人: John Lupton
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1992-05-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012240&HistoricalAwards=false
• 关键词: Thermal; Output; Sea; Floor; Hydrothermal

This project will use the DSRV ALVIN to directly study the dynamics of turbulent buoyant plumes emanating from active hydrothermal vents. The aim of the project is to provide a sound basis for relating water-comumn measurements of the effluent plumes to the thermal output of the underlying oceanic crust. The PI's propose to mount an instrument package on ALVIN that will measure temperature, conductivity (salinity), vertical and horizontal velocity, light attenuation (particledensity), and concentrations of manganese, silica, and sulfide in real time via in situ flow injection analysis. The instrument will also collect discrete water samples for laboratory analyses. Data and water samples will be collected in real time shile driving ALVIN through buoyant hydrothermal plumes at several heights in the water column. Undiluted hydrothermal source fluids and the surrounding water column will also be studied. Specific objectives incluse: (1) characterization of vertical and lateral variation in physical properties, velocities, chemical concentrations, and suspended particles within the buoyant plume, (2) quantification of entrainment and dilution rates as function of plume height, (3) determine turbulent variability in the buoyant plume and relate to property variations, and (5) testing numerical plume models against field measurements.

该项目将使用DSRV阿尔文直接研究从活跃的热液喷口发出的湍流浮力羽流的动力学。该项目的目的是为将流出羽流的水流量测量与底层洋壳的热输出联系起来提供可靠的基础。PI建议在Alvin上安装一个仪器组件，通过原位流动注射分析实时测量温度、电导率(盐度)、垂直和水平速度、光衰减(颗粒密度)以及锰、二氧化硅和硫化物的浓度。该仪器还将收集离散的水样进行实验室分析。数据和水样将被实时收集，Shile驱动Alvin通过水柱中几个高度的浮力热液羽流。还将研究未稀释的热液来源流体和周围的水柱。具体目标包括：(1)描述浮力羽流中物理性质、速度、化学浓度和悬浮颗粒的垂直和横向变化，(2)作为羽流高度函数的夹带和稀释率的量化，(3)确定浮力羽流中的湍流变异性并与性质变化有关，以及(5)根据现场测量测试羽流数值模型。