Quantifying Rates of Biological Production to Better Understand the Carbon Cycle in the Canada Basin

量化生物生产力以更好地了解加拿大盆地的碳循环

• 批准号: 1304406
• 负责人: Rachel Stanley
• 金额: $ 21.25万
• 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: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1304406&HistoricalAwards=false
• 关键词: Quantifying; Rates; Biological; Production; Better

In order to predict the future carbon cycle in a rapidly changing Arctic Ocean, a better understanding of the present-day carbon cycle is needed, and this research will study this with some relatively novel methods. The gas tracers oxygen, argon and triple oxygen isotopes can be used to quantify rates of net community production and gross primary production, respectively. Net community production is defined as photosynthesis minus community respiration and thus reflects the net amount of CO2 taken up by the ?biological pump.? Gross primary production is defined as the total photosynthetic flux. The ratio of net community to gross primary production yields information on how tightly an ecosystem is recycling its carbon. By concurrently measuring rates of net community and gross primary production, this work will study the environmental effects on photosynthesis and respiration, and this should allow a better mechanistic understanding of the processes controlling biological production.This research will use the ratio of O2 to Argon and triple oxygen isotopes to quantify rates of biological production on summertime cruises for three years in the Beaufort Gyre section of the Canada Basin. The main objective of this work is to gain a better understanding of the interplay among biological production, sea ice, and temperature in the Canada Basin. The team will use data collected in 2011 and 2012, collect samples in 2013 and interpret all the data in order to address two hypotheses. The first is that gross primary production increases when summer sea ice extent is smaller but that net community production does not change. In this case there will be no net change in the carbon cycle although production will seem elevated if one uses traditional metrics of chlorophyll or biomass. The second hypothesis is that rates of gross primary production and carbon recycling are higher in regions of actively melting ice, that is in ?ice edge blooms.? These ice edge blooms should have similar rates of net community production to the open water and be responsible for no additional net carbon uptake.Broader Impacts - Professional media designers will produce a short video about changing biological productivity in the Arctic Ocean. This will be shown at the Woods Hole Oceanographic Exhibit Center and on local ferries to Martha?s Vineyard. Additionally, this project will promote education by including opportunities for a graduate student.

为了预测北极海洋快速变化的未来碳循环，需要更好地了解当今的碳循环，这项研究将使用一些相对新颖的方法研究。气体示踪剂氧，氩和三氧同位素可分别用于量化净社区生产和总生产率。净社区生产定义为光合作用减去社区呼吸，因此反映了“生物泵”所取的二氧化碳的净量。总生产定义为总光合通量。净社区与主要生产的比率产生了有关生态系统如何回收碳的信息。 By concurrently measuring rates of net community and gross primary production, this work will study the environmental effects on photosynthesis and respiration, and this should allow a better mechanistic understanding of the processes controlling biological production.This research will use the ratio of O2 to Argon and triple oxygen isotopes to quantify rates of biological production on summertime cruises for three years in the Beaufort Gyre section of the Canada Basin.这项工作的主要目的是更好地了解加拿大盆地生物生产，海冰和温度之间的相互作用。该团队将使用2011年和2012年收集的数据，在2013年收集样本，并解释所有数据，以解决两个假设。首先是，当夏季海冰范围较小，但净社区产量不会改变时，总产量会增加。在这种情况下，碳循环不会发生净变化，尽管如果使用传统的叶绿素或生物量指标，产量似乎会升高。第二个假设是，在积极融化冰的区域中，冰缘盛开的区域中，总生产和碳回收的速度较高。这些冰边的花朵应具有与开放水的净社区生产率相似的，并且不负责其他净碳吸收。Boader的影响 - 专业媒体设计师将制作一个简短的视频，内容涉及改变北极海洋生物学生产力。这将在伍兹洞海洋展览中心和玛莎葡萄园的当地渡轮上显示。此外，该项目将通过为研究生提供机会来促进教育。