A thermocline nutrient pump

温跃层营养泵

• 批准号: NE/F002432/1
• 负责人: Jonathan Sharples
• 金额: $ 34.13万
• 依托单位: NATIONAL OCEANOGRAPHY CENTRE
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FF002432%2F1
• 关键词: thermocline; nutrient; pump

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中的关键界面。它是垂直交换的物理屏障，控制整个夏季的生物生长并能够封存大气中的二氧化碳。一旦春季花期结束，季节性温跃层将阳光普照但营养耗尽的地表水与营养丰富的黑暗深层水分开。季节性温跃层营养物质的垂直混合作用将这个光线充足的表面区域与深水营养供应结合起来，导致在温跃层（地下叶绿素最大值）内形成一层浮游植物。据估计，这种现象约占季节性分层陆架海年度碳固定的一半，但其控制物理原理才刚刚被揭开。负责跨温跃层营养物垂直混合的物理过程的识别和参数化是我们了解陆架海生态系统的重要先决条件。我们的建议是研究风驱动的惯性振荡在驱动季节性温跃层垂直混合中的作用，确定在特殊和时间尺度上产生和消散的机制和过程。该提案将通过与使用 1D 和 3D 数值模型的数值模型预测紧密结合的观测活动来实现。

项目成果

Elevated alkaline phosphatase activity in a phosphate-replete environment: Influence of sinking particles

• DOI: 10.1002/lno.10572
• 发表时间: 2017-11-01
• 期刊: LIMNOLOGY AND OCEANOGRAPHY
• 影响因子: 4.5
• 作者: Davis, Clare E.;Mahaffey, Claire
• 通讯作者: Mahaffey, Claire