Next Generation Flux Meters For Enhanced Geochemical And High-Resolution Real-Time Benthic Flux Monitoring

用于增强地球化学和高分辨率实时底栖通量监测的下一代通量计

• 批准号: 0241998
• 负责人: Kevin Brown
• 金额: $ 23.67万
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-04-15 至 2007-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0241998&HistoricalAwards=false
• 关键词: Next; Generation; Flux; Meters; Enhanced

P.I. Brown, Kevin (SIO) Proposal #: 0241998Proposal Title: Next Generation Flux Meters For Enhanced Geochemical And High-Resolution Real-Time Benthic Flux MonitoringProject Summary This proposal will fund the development and construction of two prototype instruments that measure fluid flux in cold seep environments typical of continental margin areas. These instruments have an improved capability for long-term monitoring of flow transience, from tidal to multi-month scales, and geochemical sampling. The funds will be used to build and sea test (a) an electronic optical flow system (OFS) and (b) an enhanced osmotic flow meter system (CAT II) optimized for geochemical sampling (including noble gasses). These two benthic measurement devices can be used in conjunction or separately to measure fluid flow and fluxes of dissolved chemical species of interest in cold seep environments in the following ways: a) real-time fluid flow measurements when used in conjunction with satellite/buoy or cable observatories, b) measurement of transience in fluid flow from tidal to multi-month time scales, c) enhanced seabed coupling with remote collection chambers to negate current induced noise, d) reduced dead space in collection chamber improving response time for geochemical sampling, and e) increased chemical sampling ability with the addition of gas sampling capability for noble gases and methane.The PI will test the new instrumentation in lab simulations, offshore, and in situ through deployment in a seep area where other measurements are available for comparison. The Pi is also actively pursuing a test at a prototype deep-water, acoustically linked, moored-buoy seafloor observatory on the Nootka Fault off Vancouver Island in the Northeast Pacific. The~18 month long moored-buoy site is at an active area of seepage and the buoy will be fitted with an ocean bottom seismometer (OBS), an acoustic-doppler current profiler (ADCP), temperature, chemical sensors, bottom pressure and pore pressure sensors, different types of seep meters, and a conductivity-temperature-depth (CTD) sensor. These additional data will enable the PI to correlate his results with several different types fluid flow estimation methods (e.g. the pore pressure sensors) as well as with different potential impulses driving any transience in flow (i.e. tides, ocean currents and seismcity).

P.I.Brown，Kevin(SIO)提案#：0241998提案标题：用于增强地球化学和高分辨率实时海底通量监测的下一代流量计项目摘要该提案将资助开发和建造两台原型仪器，用于测量大陆边缘地区典型的寒冷渗漏环境中的流体流量。这些仪器提高了对水流瞬变的长期监测能力，从潮汐尺度到数月尺度，以及化探采样。这笔资金将用于建造和海上测试(A)电子光学流量系统(OFS)和(B)优化的用于地球化学采样(包括贵重气体)的增强型渗透流量计系统(CAT II)。这两个海底测量设备可以联合或单独使用，以下列方式测量冷渗漏环境中的流体流量和感兴趣的溶解化学物质的通量：a)与卫星/浮标或电缆观测站结合使用时的实时流体流量测量，b)从潮汐到数月时间尺度的流体流动瞬变的测量，c)增强海底与远程采集室的耦合，以消除电流引起的噪音，d)减少采集室中的死区，改善化探采样的响应时间，以及e)通过增加稀有气体和甲烷的气体采样能力，提高化学采样能力。PI将在实验室模拟中测试新仪器，近海和现场通过在渗漏区部署，在那里可以进行其他测量以供比较。PI还积极地在东北太平洋温哥华岛附近努特卡断层上的一个深水、声学连接、系泊浮标的原型海底观测站进行测试。长约18个月的系泊浮标位于渗漏活跃区域，浮标将安装海底地震仪(OBS)、声学多普勒海流剖面仪(ADCP)、温度、化学传感器、海底压力和孔压传感器、不同类型的渗透仪和电导率-温度-深度(CTD)传感器。这些额外的数据将使PI能够将他的结果与几种不同类型的流体流量估计方法(例如孔压传感器)以及驱动流动中任何瞬变的不同潜在脉冲(即潮汐、洋流和地震)相关联。