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Assessing the role of eddies in exchanging nutrients across the European Shelf

评估涡流在欧洲大陆架营养物质交换中的作用

基本信息

批准号：
NE/J020141/1
负责人：
Claire Mahaffey
金额：
$ 19.27万
依托单位：
University of Liverpool
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2012
资助国家：
英国
起止时间：
2012 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FJ020141%2F1
关键词：
Assessing role eddies exchanging nutrients

项目摘要

The ocean is full of time-varying, swirling circulations, called eddies. These eddies transfer heat, nutrients and carbon from one region to another, affecting the local store of each of these properties. This eddy exchange potentially becomes important across strong flows, such as boundary currents, jets and slope currents. However, while eddies are seen to occur throughout the ocean (such as remotely sensed observations), there have been very few systematic, repeated observations revealing how eddies transfer properties in the horizontal, particularly below the surface. Instead we have to rely on a combination of model and theoretical studies to understand the role of eddies in the ocean, often drawing parallels with how weather systems behave in the atmosphere.In this study, we wish to use the new glider technology to identify how eddies transfer nutrients in the horizontal. We wish to investigate this eddy transfer on the European Shelf at three different sites, drawing on the support of an existing programme, FASTNET, examining the physical exchange across the shelf break. Our aim is to include nutrient sensors in two gliders, one supported under FASTNET and the other supported via this call. Together with nutrient data from FASTNET cruises, we aim to use the glider data to estimate the eddy flux of nutrients in these three different sites between the open ocean and shelf seas. Our hypothesis is that the eddies provide a flux of inorganic nutrients from the open ocean to the shelf seas, across the shelf break, as well as a return flux of dissolved organic nutrients from the shelf seas to the open ocean.The eddy fluxes of nutrients onto the shelf are potentially important in sustaining biological productivity, there are particularly high rates of photosynthesis here, sustaining fishing activity and providing a biological drawdown of atmospheric carbon dioxide.In the longer term, the glider technology has the potential to provide the repeated observations needed to quantify eddies fluxes throughout the ocean. This step is necessary to really understand how heat, nutrients and carbon are transferred throughout the ocean, as well as the wider goal of how the ocean operates in the climate system.

海洋充满了随时间变化的旋转环流，称为漩涡。这些漩涡将热量、营养物质和碳从一个地区转移到另一个地区，影响这些属性的当地储存。这种涡流交换可能在强流（如边界流、急流和斜坡流）中变得重要。然而，虽然涡流被认为是发生在整个海洋（如遥感观测），很少有系统的，重复的观测揭示了如何涡流转移性能的水平，特别是在表面以下。相反，我们必须依靠模型和理论研究的结合来理解海洋中涡流的作用，通常与大气中天气系统的行为相似。在这项研究中，我们希望使用新的滑翔机技术来确定涡流如何在水平方向上传输营养物质。我们希望在三个不同的网站上调查欧洲大陆架上的涡流传输，利用现有的方案，FASTNET的支持，检查整个大陆架断裂的物理交换。我们的目标是在两个滑翔机中包括营养传感器，一个由FASTNET支持，另一个通过这个电话支持。结合FASTNET巡航的营养数据，我们的目标是使用滑翔机数据来估计公海和陆架海之间这三个不同地点的营养物质涡动通量。我们的假设是，涡旋提供了一个通量的无机营养盐从开放的海洋到陆架海，跨越大陆架断裂，以及返回通量的溶解有机营养盐从大陆架海到开放的海洋。营养盐的涡旋通量到大陆架是潜在的重要维持生物生产力，有特别高的光合作用率在这里，从长远来看，滑翔机技术有可能提供量化整个海洋涡旋通量所需的重复观测。这一步对于真正了解热量、营养物质和碳如何在整个海洋中转移以及海洋如何在气候系统中运作的更广泛目标是必要的。