PcynMix (Pcynocline Mixing in Shelf Seas)

PcynMix（大陆架海中的 Pcynocline 混合）

基本信息

批准号：
NE/L003600/1
负责人：
Tom Rippeth
金额：
$ 28.26万
依托单位：
Bangor University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FL003600%2F1
关键词：
PcynMix Pcynocline Mixing Shelf Seas

项目摘要

The continental shelf seas provide a transition zone between estuaries and the ocean across which carbon, nutrients, sediments and contaminants are exchanged. The currents and mixing on the NW European continental shelf are dominated by the tide interacting with the sea bed, with density stratification occurring during summer months across ~80% of the region. Significant levels of biological primary production occur in these regions. However, the exchange of nutrients and carbon across these critical interfaces of stratified fluid is poorly understood and so is poorly represented in numerical models.This project aims to compile the world's largest observational data base of shelf sea pycnocline turbulence and hydrographic measurements and to exploit state-of-the-art computer modelling and new observational technology to investigate, quantify, and parameterise the physical mechanisms and processes responsible for the fluxes across this critical interface. In particular we will develop improved understanding of pycnocline turbulence and mixing promoted by shear instability. We will test the hypothesis that these mechanisms, or interaction between mechanisms, drives pycnocline shear to levels which exceed a critical threshold beyond which there is a catastrophic loss of stability resulting in episodic mixing. Parameterisations for this mixing will be developed and tested.

大陆架海洋在河口和海洋之间提供了一个过渡区，碳，养分，沉积物和污染物被交换。 NW欧洲大陆架上的电流和混合以与海床相互作用的潮汐相互作用，在该地区约80％的夏季，密度分层发生。在这些地区，生物初级生产的显着水平。然而，对分层流体的这些关键界面的养分和碳的交换知之甚少，因此在数值模型中的代表很差。该项目旨在汇编世界上最大的观察数据库，用于货架海上的架子pycnocline的湍流和水文测量，并针对机构的机制，并针对统一的计算机模型，并将其定向，并针对前部的计算机模型，并参与了现有的计算机模型，并参与了量化的机制，并将其参与量身定制的机构，并针对统计的机构进行了范围的机构，并针对机构进行了范围，并将其参与跨这个关键接口的通量。特别是，我们将进一步提高人们对剪切不稳定性促进的对pycnocline湍流和混合的理解。我们将检验以下假设：这些机制或机制之间的相互作用将pycnocline剪切驱动到超过临界阈值的水平，超过了稳定性的灾难性丧失，导致情节混合。将开发和测试此混合的参数化。