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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.

大陆架海提供了河口和海洋之间的过渡区，碳、营养物、沉积物和污染物在该过渡区进行交换。欧洲大陆架西北部的海流和混合主要是潮汐与海床的相互作用，在夏季，该地区约 80% 的地区会出现密度分层。这些地区的生物初级生产水平很高。然而，人们对分层流体这些关键界面上的营养物和碳的交换知之甚少，因此在数值模型中也很难得到体现。该项目旨在编制世界上最大的陆架海密斜湍流和水文测量的观测数据库，并利用最先进的计算机建模和新的观测技术来研究、量化和参数化造成这些现象的物理机制和过程。穿过这个关键界面的通量。特别是，我们将加深对剪切不稳定性促进的重斜湍流和混合的理解。我们将测试以下假设：这些机制或机制之间的相互作用将密斜剪切力驱动到超过临界阈值的水平，超过该阈值就会出现灾难性的稳定性损失，从而导致间歇性混合。将开发和测试这种混合的参数化。