Particle Export during the Southern Ocean Iron Experiment (SOFeX)

南大洋铁实验期间的粒子输出（SOFeX）

• 批准号: 9987501
• 负责人: Ken Buesseler
• 金额: $ 19.12万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9987501&HistoricalAwards=false
• 关键词: Particle; Export; during; Southern; Ocean

ABSTRACTOCE-9987501While it has been shown that the addition of Fe can stimulate phytoplankton growth and alter upper ocean biogeochemistry, little is know about the net effect of Fe availability on sinking particle fluxes. If Fe played an important role in past variations in CO2 or if there will be long term effects of Fe on CO2 due to deliberate manipulation of ocean ecosystems, then it becomes essential to quantify the net change in export fluxes of carbon and associated elements in response to Fe loading. For this reason, the PI will quantify changes in particulate organic carbon and particulate organic nitrogen export during the Southern Ocean Iron Experiment (SOFeX) using the naturally occurring radionuclide thorium-234. Using time-series profiles of 234Th obtained both inside and outside of the SOFeX study area, the PI will be able to study the export response to changes in Fe loading and community structure, as well as assist in the calculation of the carbon and nutrient fluxes in response to the Fe additions. Information on the export response of the upper ocean to Fe enrichment will be used to understand past oceanic responses to Fe/dust inputs and assess future impacts of deliberate Fe fertilization proposed to offset carbon dioxide emissions.

Abstractoce-9987501虽然表明，Fe的添加可以刺激浮游植物的生长并改变上海生物地球化学，但对Fe可用性对下沉颗粒通量的净效应的净效应知之甚少。 如果FE在二氧化碳的过去变化中起重要作用，或者由于故意操纵海洋生态系统而将Fe对CO2产生长期影响，那么对于响应FE负荷而量化碳的出口通量和相关元素的净变化至关重要。 因此，使用天然存在的放射性核素Thorium-234，PI将在南洋铁铁实验（SOFEX）期间量化颗粒有机碳和有机氮的变化。 使用SOFEX研究区域内外获得的234TH的时间序列曲线，PI将能够研究对Fe负荷和社区结构变化的出口响应，并有助于计算Fe添加的碳和营养通量。 有关上海对Fe富集的出口响应的信息将用于了解过去对FE/DUST投入的海洋反应，并评估提议抵消二氧化碳排放的故意FE受精的未来影响。