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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

基本信息

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

项目摘要

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.

尽管大陆架海只占世界海洋表面相对较小的一部分（约7%），但它们被认为对开放海洋的二氧化碳储存做出了重大贡献（占总量的20%至50%）。大气中二氧化碳的减少是由生物泵驱动的，这种泵只在大陆架海洋的季节性分层区有效。这个泵的一个限制因素是垂直混合，它将营养物质跨越季节性温跃层输送到光区，从而支持新的初级生产。虽然剖面仪技术已经成功地用于通过测量epsilon剖面（湍流动能耗散率）来估计垂直混合速率，但这些技术成本高且耗时长，因此测量仅限于短时间（12-24小时）。我们的建议是在雷达气象学中已经使用的一种技术的基础上开发一种新技术，该技术使用常规的现成ADCP来测量温跃层中epsilon垂直结构的长时间序列。该技术将首先应用于我们已经收集的数据，并且结果将针对同时收集的epsilon的分析器测量值进行验证。我们还建议在更基本的水平上测试该技术-使用光谱技术-对我们计划在梅奈海峡收集的数据进行测试。