Development of a Seafloor Piston Pressure Gauge for Vertical Marine Geodesy

用于垂直海洋大地测量的海底活塞压力计的开发

• 批准号: 0623675
• 负责人: Mark Zumberge
• 金额: $ 26.88万
• 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: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0623675&HistoricalAwards=false
• 关键词: Development; Seafloor; Piston; Pressure; Gauge

The PIs request funding to develop and test a pressure gauge reference for use on the sea floor. This instrument will be based on commercially available piston gauge calibrations systems, modified for automated operation on the seafloor. A piston gauge calibration system uses a calibrated mass loaded onto a hydraulic piston to generate a pressure; the pressure can be accurately known in an absolute sense by determining the mass values, piston dimensions and the local acceleration of gravity. Such a system can be transformed into a pressure reference, a single-valued pressure source. By in-situ comparing a sea-floor pressure gauge with a pressure reference, the pressure gauge drift can be unambiguously determined and removed from the time series. The pressure reference need only be stable and highly reproducible, which presents significant metrological advantages. A reference based on commercially available instruments could achieve drift control with uncertainties of only a few parts per million, or 1 cm/year at depths of 2000 meters. Broader ImpactsThe proposed work could potentially lead to an important advance in bottom pressure instrumentation to measure crustal (ocean bottom) movement in at deep ocean depths. The drift issue of bottom ocean sensors depth sensors have been a limitation in these devices uses to measure accurately vertical movements. This approach if successful will help researchers in geodesy, tectonics, marine geology, physical oceanography, and climate studies. Increasing the absolute accuracy of long-term seafloor pressure gauge measurements by providing a reference pressure signal to calibrate and allow removal of gauge drift would allow for usage of easily deployed seafloor pressure gauges for long-term geodetic measurements and would also have other applications in seafloor and subseafloor observatories. The PIs have an excellent record of sharing the results of their research and instrument development with the oceanographic community through presentations at meeting and publication of peer-reviewed papers.

PI要求提供资金，以开发和测试用于海底的压力计参考。该仪器将以商业上可获得的活塞式压力计校准系统为基础，经过改装，可在海底自动操作。活塞式压力计校准系统使用加载到液压活塞上的校准质量来产生压力;通过确定质量值、活塞尺寸和局部重力加速度，可以在绝对意义上准确地知道压力。这样的系统可以转换为压力参考，单值压力源。通过现场比较海底压力计与压力基准，可以明确确定压力计漂移，并从时间序列中删除。压力参考仅需要是稳定的和高度可再现的，这呈现显著的可编程性优点。基于商用仪器的参考可以实现漂移控制，其不确定性仅为百万分之几，即在2000米深处为1厘米/年。更广泛的影响拟议的工作可能会导致一个重要的进步，在底部压力仪器测量地壳（海底）运动在深海深处。海底传感器、深度传感器的漂移问题一直是这些设备用于精确测量垂直运动的一个限制。这种方法如果成功，将有助于大地测量学，构造学，海洋地质学，物理海洋学和气候研究的研究人员。通过提供基准压力信号进行校准并消除压力计漂移，提高长期海底压力计测量的绝对准确度，将使易于部署的海底压力计能够用于长期大地测量，并在海底和海底下观测站中有其他应用。这些专业研究员通过在会议上发言和发表同行评审的论文，与海洋学界分享其研究和仪器开发的成果。