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.

温带架子海洋中的季节性热跃层是架子海系统中的关键界面。它是垂直交换的物理障碍，可以在整个夏季控制生物学生长，并实现大气二氧化碳的隔离。一旦春季开花在季节性热跃层上，阳光浸透了，但养分耗尽的地表水与深色营养丰富的深水。整个季节热层面的养分的垂直混合起作用，使这个光线充足的表面区域与深水养分供应融为一体，从而导致在热跃层中形成一层浮游植物（地下叶绿素最大值）。据估计，这种现象约占季节性货架海中年度碳固定的一半，但控制物理学只是被弄清。识别和参数化的物理过程，负责在热层上垂直混合营养素的物理过程是我们对货架海生态系统的理解的重要先决条件。我们的建议是研究风驱动的惯性振荡在跨季节性热跃层驱动垂直混合中的作用，确定导致其产生和耗散特殊和时间尺度耗散的机制和过程。该提案将通过使用1D和3D数值模型的数值模型预测紧密整合的观察活动来实现。

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