Collaborative Research: Iron-light Co-limitation in the Deep Chlorophyll Maximum of Stratified Oceanic Regimes

合作研究：分层海洋区域深部叶绿素最大值的铁-光共同限制

• 批准号: 0550365
• 负责人: Elizabeth Mann
• 金额: --
• 依托单位: Skidaway Institute of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0550365&HistoricalAwards=false
• 关键词: Collaborative; Research; Iron; light; Co

Researchers from Scripps Institute of Oceanography, the University of Hawaii, and Skidaway Institute of Oceanography plan to test the hypothesis that iron-light co-limitation at the deep chlorophyll maxima (DCM) is a widespread feature of oceanic stratified euphotic zones, and an important control on phytoplankton community composition and size structure. Three different types of DCM will be investigated: mesotrophic, relatively shallow maxima, deeper, chlorophyll per cell based DCM characteristic of oligotrophic gyres, and the Prochlorococcus maximum found just below the oxic/suboxic boundary in the Eastern Tropical North Pacific. To attain their goals, the scientists will carry out the following tasks during the cruises: (1) characterize water column parameters including basic hydrography, nutrient distributions, iron concentration and speciation, phytoplankton community structure, and primary productivity and photosynthetic efficiency; (2) conduct co-limitation incubation experiments at the three types of DCMs; and (3) determine picoplankton cell division and grazing rates. As regards broader impacts, the researchers plan to recruit undergraduates from both the University of California-San Diego and from an historically black college or university such as Savannah State University via the Collaborations in Integrating Research and Education Program using Research Experience for Undergraduates supplemental funds. A science teacher from California and one from Georgia will be asked to participate in research cruises using supplemental funds from Research Experiences for Teachers. Both teachers will be expected to produce educational materials based on their field experiences. One graduate student from the University of California-San Diego, one from the University of Hawaii and one from Skidaway Institute of Oceanography will be trained and supported as part of this study.

来自斯克里普斯海洋研究所、夏威夷大学和斯基德威海洋研究所的研究人员计划检验这一假设，即深部叶绿素最大值（DCM）的铁光共限制是海洋层状透光带的普遍特征，也是海洋层状透光带的一个重要特征。控制浮游植物群落组成和规模结构。将研究三种不同类型的 DCM：中营养型、相对较浅的最大值、较深的、基于每个细胞叶绿素的寡营养环流特征的 DCM，以及在东部热带北太平洋含氧/缺氧边界下方发现的原绿球藻最大值。为了实现他们的目标，科学家们将在航行期间执行以下任务：（1）表征水体参数，包括基本水文学、营养物分布、铁浓度和物种形成、浮游植物群落结构、初级生产力和光合效率； (2)在三种类型的DCM上进行共限制孵育实验； (3) 确定超微型浮游生物细胞分裂和摄食率。至于更广泛的影响，研究人员计划利用本科生研究经验补充资金，通过整合研究和教育项目的合作，从加州大学圣地亚哥分校和萨凡纳州立大学等历史悠久的黑人学院或大学招募本科生。来自加利福尼亚州的一名科学教师和来自乔治亚州的一名科学教师将被要求使用教师研究经验的补充资金参加研究巡游。两位老师都将根据他们的现场经验制作教材。作为这项研究的一部分，加州大学圣地亚哥分校的一名研究生、夏威夷大学的一名研究生和斯基德威海洋学研究所的一名研究生将接受培训和支持。