Sea Ice and Planktonic Foraminifera in the Arctic: Productivity and Geochemistry

北极的海冰和浮游有孔虫：生产力和地球化学

• 批准号: 0902707
• 负责人: William Curry
• 金额: $ 30.98万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2012-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902707&HistoricalAwards=false
• 关键词: Sea; Ice; Planktonic; Foraminifera; Arctic

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The goal of this project is designed to reduce uncertainties about the causes of variability in N. pachyderma (s) ä18O using a series of sediment traps and real-time hydrographic observations to better understand: 1) the seasonal production and isotopic chemistry of N. pachyderma (s) in the Arctic, 2) the relationship of the presence of this taxon to the amount of sea ice cover, and 3) the degree to which the smaller N. pachyderma (s) shells may be affected by lateral transport processes from the wide Arctic shelves into the deep basins of the Arctic Ocean.The sediment traps are located in the Beaufort Gyre and have been deployed as part of the Beaufort Gyre Observing System. An initial sediment trap deployment sampled the 2004- 2005 annual cycle and four others sampled the 2007-2008 annual cycle. The sediment trap samples are complemented by a complete set of standard hydrographic measurements (temperature, salinity, depth, and current velocity), taken approximately once a day and spanning the water column from 50 to 2000 m below the surface. The moorings include upward-looking echo sounders to provide a record of sea ice concentration and thickness above each site. Ice Tethered Profiling Systems also transited the study area during the sediment trap deployments, providing quality records of sea ice thickness and hydrographic properties from the surface down to about 800 m during the winter periods of complete ice cover. These sediment trap samples and complementary hydrographic data will be used to evaluate the relationship of N. pachyderma (s) to changes in sea ice and low salinity.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。pachyderma（s）ä18 O的研究，利用一系列沉积物收集器和实时水文观测，以更好地了解：1）N的季节生产和同位素化学。2）该分类群的存在与海冰覆盖量的关系，以及3）较小的N.厚皮壳可能会受到从广阔的北极大陆架到北冰洋深海盆地的横向迁移过程的影响。沉积物收集器位于博福特环流中，并已作为博福特环流观测系统的一部分部署。最初部署的沉积物收集器对2004- 2005年年度周期进行了取样，另外四个对2007-2008年年度周期进行了取样。沉积物收集器的样本还辅以一整套标准水文测量（温度、盐度、深度和流速），大约每天进行一次，覆盖水面以下50至2 000米的水柱。系泊设备包括向上观察的回声探测器，以记录每个地点上方的海冰浓度和厚度。冰系剖面测量系统也在沉积物收集器部署期间经过研究区域，提供了海冰厚度的高质量记录，以及在冬季完全冰盖期间从表面到大约800米的水文特性。这些沉积物收集器样本和补充水文数据将用于评估N。厚皮病与海冰和低盐度的变化有关。