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.

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该分类单元的存在与海冰覆盖量的数量，以及3）较小的粉状壳壳壳的程度可能会受到从北极宽的架子横向运输过程影响到北极海洋深贝斯的横向运输过程的程度。沉积物陷阱位于Beaufort Gyre，已被部署为Beaufort Gyre观察系统的一部分。最初的沉积物陷阱部署采样了2004年至2005年周期，另外四个则取样了2007-2008年周期。沉积物陷阱样品通过一组完整的标准水文测量值（温度，盐度，深度和电流速度）完成，每天大约采集一次，跨越水面的水柱从表面以下50到2000 m。系泊设备包括向上的回声声音，以提供每个位置上方海冰浓度和厚度的记录。在沉积物陷阱部署期间，冰束缚的分析系统还将研究区域转移，从而在冬季完整的冰盖覆盖期间，提供了海冰厚度和水文特性的质量记录。这些沉积物陷阱样品和完整的水文数据将用于评估帕切尔马乳杆菌与海冰变化和低盐度的关系。