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A New Method for the Estimation of Profiles of Diffusivity in the Stratified Marine Environment

分层海洋环境中扩散率剖面估计的新方法

基本信息

批准号：
NE/F019467/1
负责人：
Tom Rippeth
金额：
$ 25.99万
依托单位：
Bangor University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FF019467%2F1
关键词：
New Method Estimation Profiles Diffusivity

项目摘要

Much of the ocean is stably stratified with lighter water overlying heavier water, with the vertical movement of nutrients, salt, heat, and pollutants across stratification driven by turbulent mixing. The nature and strength of the processes which are responsible for these vertical fluxes therefore play a major role in shaping the marine system. For example, vertical fluxes of nutrients link the dark, nutrient-rich, deep waters with the upper, sunlit, part of the water column promoting the primary productivity which supports the marine ecosystem. Vertical mixing is also one of the main mechanisms behind the large scale ocean circulation, and therefore of immense importance for the climate of our planet. A number of techniques have been developed for the estimation of vertical mixing rates in the marine environment. These include direct measurements of the turbulence using a freefalling profiler, which is a very time consuming and labour intensive technique requiring teams of specialist scientists. Other methods use acoustic current meters, which can be deployed in the marine environment and then left for a period of time. However, this method has a limited vertical range, and up until now has not worked well in environments with vertical stratification or when deployed from moving platforms. Our proposal here is to extend an acoustic technique, which we have developed, for measuring marine turbulence, using relatively cheap, off-the-shelf instruments, to the stratified marine environment. Our aim is to develop a simple to operate and effective add-on system that can be used on conventional profiling platforms (i.e. CTDs), for the measurement of profiles turbulence in a stratified marine environment. Such a system would significantly simplify measuring oceanic turbulence, facilitating more turbulence measurements and enabling an improved understanding of this important process.

大部分海洋是稳定分层的，较轻的水覆盖在较重的水上，营养物质，盐，热量和污染物的垂直运动由湍流混合驱动。因此，造成这些垂直通量的过程的性质和强度在塑造海洋系统方面起着重要作用。例如，营养物的垂直通量将营养物丰富的黑暗沃茨与阳光照射的上层水柱联系起来，促进了支持海洋生态系统的初级生产力。垂直混合也是大规模海洋环流背后的主要机制之一，因此对我们星球的气候至关重要。已经开发了一些技术来估计海洋环境中的垂直混合率。其中包括使用自由落体剖面仪直接测量湍流，这是一项非常耗时和劳动密集型的技术，需要专业科学家团队。其他方法使用声学海流计，可以将其部署在海洋环境中，然后放置一段时间。然而，该方法具有有限的垂直范围，并且直到现在在具有垂直分层的环境中或当从移动平台部署时还不能很好地工作。我们在这里的建议是延长声学技术，我们已经开发，测量海洋湍流，使用相对便宜，现成的仪器，分层的海洋环境。我们的目标是开发一个简单的操作和有效的附加系统，可用于传统的剖面平台（即CTD），在分层的海洋环境中的剖面湍流测量。这种系统将大大简化海洋湍流的测量，促进更多的湍流测量，并使人们能够更好地了解这一重要过程。