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A thermocline nutrient pump

温跃层营养泵

基本信息

批准号：
NE/F002858/1
负责人：
Tom Rippeth
金额：
$ 54.53万
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%2FF002858%2F1
关键词：
thermocline nutrient pump

项目摘要

The seasonal thermocline in temperate shelf seas acts as a critical interface in the shelf sea system. It is a physical barrier to vertical exchange, controlling biological growth through the summer and enabling the sequestration of atmospheric CO2. Once the spring bloom is over the seasonal thermocline separates the sun drenched but nutrient deplete surface waters from the dark nutrient rich deep water. The vertical mixing of nutrients across the seasonal thermocline acts to couple this well-lit surface zone with the deep water nutrient supply, leading to the formation of a layer of phytoplankton within the thermocline (the subsurface chlorophyll maxima). This phenomenon is estimated to account for about half of the annual carbon fixation in seasonally stratified shelf seas, and yet the controlling physics is only just being unravelled. The identification and parameterisation of the physical processes which are responsible for the vertical mixing of nutrients across the thermocline is a vital prerequisite to our understanding of shelf sea ecosystems. Our proposal is to investigate the role of wind driven inertial oscillations in driving vertical mixing across the seasonal thermocline, identifying the mechanisms and processes responsible for their generation and dissipation on both special and temporal scales. The proposal will be achieved through an observational campaign closely integrated with numerical model predictions using both 1D and 3D numerical models.

温带陆架海的季节性温跃层是陆架海系统的重要界面。它是垂直交换的物理屏障，控制了整个夏季的生物生长，并使大气中的二氧化碳得以封存。一旦春暖花开，季节性温跃层将被太阳淋得湿透但营养物质枯竭的表层水域与营养丰富的深水隔开。季节性温跃层营养物质的垂直混合作用将这一光照良好的表层与深水营养物质供应结合在一起，导致在温跃层内形成一层浮游植物(次表层最大叶绿素)。据估计，在季节性分层的陆架海中，这一现象约占每年碳固定总量的一半，然而，控制这一现象的物理机制才刚刚被揭开。物理过程的确定和参数化是我们理解陆架海洋生态系统的重要前提，这些物理过程负责通过温跃层垂直混合营养物质。我们的建议是研究风驱动的惯性振荡在推动季节温跃层垂直混合中的作用，确定它们在特殊和时间尺度上产生和消散的机制和过程。这项提议将通过一维和三维数值模式与数值模式预报紧密结合的观测活动来实现。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Surface mixed layer deepening through wind shear alignment in a seasonally stratified shallow sea

DOI：
10.1002/2015jc011382
发表时间：
2016-08
期刊：
Journal of Geophysical Research
影响因子：
0
作者：
B. Lincoln;T. Rippeth;J. Simpson
通讯作者：
B. Lincoln;T. Rippeth;J. Simpson

Variable behavior in pycnocline mixing over shelf seas

DOI：
10.1029/2012gl054638
发表时间：
2013-01
期刊：
Geophysical Research Letters
影响因子：
5.2
作者：
M. Palmer;J. Polton;M. Inall;T. Rippeth;J. A. M. Green;J. Sharples;J. Simpson
通讯作者：
M. Palmer;J. Polton;M. Inall;T. Rippeth;J. A. M. Green;J. Sharples;J. Simpson

Generation of Bulk Shear Spikes in Shallow Stratified Tidal Seas