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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.

虽然大陆架海只占世界海洋表面的一小部分（约7%），但它们被认为对开阔海洋储存二氧化碳做出了重大贡献（占总量的20%至50%）。二氧化碳从大气中的下降是由生物泵驱动的，这种泵只在陆架海的季节性分层区有效。这种泵的一个限制性组成部分是垂直混合，它将营养物质穿过季节性温跃层供应到透光层，从而支持新的初级生产。虽然剖面仪技术已成功地用于通过测量湍流动能的耗散率（湍流动能的耗散率）的剖面来估计垂直混合率，但这些技术既昂贵又耗时，因此测量仅限于较短的时间段（12-24小时）。我们的建议是开发一种新的技术，在雷达气象学中已经使用的技术的基础上，它使用一个传统的现成的ADCP，测量长时间序列的垂直结构的跃层中的盐度。该技术最初将应用于我们已经收集的数据，并将根据同时收集的Profiler测量结果对结果进行验证。我们还建议测试技术在一个更基本的水平-使用光谱技术-对数据，我们建议收集在梅奈海峡。