A Collaborative Proposal on Particle Dynamics in an Arctic Ecosystem: Role of Enzymatic Hydrolysis in Carbon Export

关于北极生态系统中粒子动力学的合作提案：酶水解在碳输出中的作用

• 批准号: 9710029
• 负责人: Jody Deming
• 金额: $ 52.13万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-15 至 2002-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9710029&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Particle; Dynamics; Arctic

This research proposal is an integral component of the international North Water (NOW) polynya project, a Canadian led effort to characterize the open-water ecosystem in the northern portion of ice-covered Baffin Bay. The region is of significant geopolitical interest due to commercial fisheries, shipping access to the Arctic, and to the native Inuit people who depend upon the extraordinary biological production in the NOW for their livelihood. Of parallel scientific interest is the fate of pelagic primary production exported from the system: i.e., whether sinking particulate materials remain available to support higher trophic levels or are recycled microbially at depth. This research is designed to test the hypothesis that cold temperature limits midwater microbial activities; it also examines specific enzymatic responses as predictive indicators of the autotrophic versus heterotrophic nature of the overlying ecosystem, within the context of the flow field. The PIs will test these and other questions by deploying a combination of particle sensors and collectors throughout NOW in the summers of 1997 and 19998. These will include long-term sediment traps secured to current-meter moorings, transmissometry measurements, in situ camera assessments of large-particles, and shipboard settling-column collections.

这项研究计划是国际北水（NOW）多冰湖项目的一个组成部分，该项目由加拿大领导，旨在描绘冰覆盖的巴芬湾北部开放水域生态系统的特征。该地区具有重要的地缘政治利益，因为它有商业渔业、通往北极的航运通道，以及当地因纽特人的生计，他们依靠现在非凡的生物生产。同样具有科学意义的是从该系统出口的远洋初级产品的命运：即下沉的颗粒物质是否仍然可用来支持更高的营养水平，或者是否在深处被微生物循环利用。本研究旨在验证低温限制水中微生物活动的假设；它还研究了特定的酶反应，作为流场背景下上覆生态系统自养与异养性质的预测指标。在1997年和1998年的夏天，pi将在整个NOW部署粒子传感器和收集器的组合来测试这些问题和其他问题。这将包括固定在流速计系泊处的长期沉积物捕集器、透射测量、大颗粒的原位相机评估以及船上沉降柱收集。