The Development and Testing of a New Technique for the Estimation of Profiles of Epsilon using an Acoustic Doppler Current Profiler (ADCP)

使用声学多普勒电流轮廓仪 (ADCP) 估计 Epsilon 轮廓的新技术的开发和测试

• 批准号: NE/D007003/1
• 负责人: Tom Rippeth
• 金额: $ 7.87万
• 依托单位: Bangor University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FD007003%2F1
• 关键词: Development; Testing; New; Technique; Estimation; Development; Testing; New; Technique; Estimation

Although Continental shelf seas make up a relatively small fraction (~7%) of the world ocean's surface they are thought to make a major contribution (accounting for between 20 and 50% of the total) to the open ocean storage of CO2. The drawdown of CO2 from the atmosphere is driven by a biological pump which is only effective in seasonally stratified zones of the shelf seas. A limiting component of this pump is the vertical mixing which supplies nutrients across the seasonal thermocline to the euphotic zone, thus supporting new primary production. Whilst profiler techniques have been successfully used to estimate the vertical mixing rate through measurement of profiles of epsilon (the rate of dissipation of turbulent kinetic energy) these techniques are costly and time consuming and so measurements limited to short (12-24 hours) periods of time. Our proposal is to develop a new technique, based on a technique already used in Radar Meteorology, which uses a convensional off the shelf ADCP, to measure long time series of the vertical structure of epsilon in the thermocline. The technique will initially be applied to data we have already collected, and the results will be validated against simultaneously collected profiler measurements of epsilon. We also propose to test the technique at a more fundamental level - using spectral techniques - on data which we propose to collect in the Menai Strait.

尽管大陆架海洋构成了世界海面的相对较小的部分（约7％），但它们被认为是对CO2开放海洋存储的主要贡献（占总数的20％至50％）。大气中的二氧化碳逐渐减少是由生物泵驱动的，该泵仅在货架海的季节性分层区域有效。该泵的一个限制成分是垂直混合物，该垂直混合物将整个季节性热跃层的养分供应到舒适区，从而支持新的初级生产。尽管已成功使用剖面技术来通过测量epsilon的曲线（湍流动能的耗散速率）来估计垂直混合速率，但这些技术是昂贵且耗时的，因此测量限制为限制为短（12-24小时）的时间。我们的建议是基于在雷达气象学中已经使用的技术开发一种新技术，该技术利用架子ADCP的汇总式ADCP来测量epsilon在热阶段的垂直结构的长时间序列。该技术最初将应用于我们已经收集的数据，结果将针对EPSILON的同时收集的剖面测量值进行验证。我们还建议在更基本的层面（使用光谱技术）上测试该技术，并建议我们在Menai海峡收集的数据。