Impact of Episodic Transport and Resuspension on Coastal Phytoplankton Processes: A Case Study of Lake Michigan Recurrent Coastal Plume

间歇性迁移和再悬浮对沿海浮游植物过程的影响：密歇根湖循环沿海羽流的案例研究

• 批准号: 9727342
• 负责人: Oscar Schofield
• 金额: $ 25.24万
• 依托单位: Rutgers University New Brunswick
• 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: 1997-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9727342&HistoricalAwards=false
• 关键词: Impact; Episodic; Transport; Resuspension; Coastal

Research will be undertaken in response to an Announcement of Opportunity (NSF 97-38)for Coastal Studies in the Great Lakes. This is a collaborative research project between investigators from ten academic and government research institutions. The research is being conducted under the auspices of the NSF Coastal Ocean Processes (CoOP) program and the NOAA Coastal Ocean Program. This collaborative, 5-year research program will focus on the importance of episodic events on nearshore-offshore transport and subsequent ecological consequences. The study seeks to 1) determine what processes control the cross- margin (inshore to offshore) transport of biological, chemical, and geological materials in the coastal margins of the Great Lakes, and to 2) develop and test scientific strategies for assessing, quantifying, and predicting the impacts of multiple stresses both natural and anthropogenic, in the Great Lakes or selected coastal sub-regions. A tight coupling between contaminated sediments and overlying water exists in lakes and coastal ecosystems through the process of sediment resuspension. Satellite observations in Lake Michigan illustrate an annually recurrent episode of nearshore-offshore transport, a 10 km wide plume of resuspended material extending over 200 km along the southern shores of the lake. Preliminary evidence indicates that this episodic event may be the major mechanism for cross-margin sediment transport in Lake Michigan. This type of event impacts recycling of biogeochemically important materials (BIMS), ecosystem responses, cross-isobath transport in the Great Lakes. The program results will be applicable to similar events in many coastal areas. This comprehensive, interdisciplinary study will implement an integrated observational program and numerical modeling effort to identify, quantify, and develop prediction tools for the winter-spring resuspension event and to assess the impact of this event on the transport and transformation of BIMS and on lake ecology. This component of the study focuses on understanding of ecophysiological mechanisms controlling phytoplankton and community structure during episodic, physical forcing events within the Great Lakes. The measurement of cellular, species, group, and community processes coupled with state- of-the-art, bio-optical instrumentation will allow for a unique comprehensive examination of the taxon-specific and community responses to distinct physical forcing factors. Work will also further develop, evaluate, and improve the current bio-optical production model for Lake Michigan and assist in efforts to develop fresh water remote-sensing algorithms.

将根据公告进行研究 机会（NSF 97-38）在大海岸研究 湖泊. 这是一个合作研究项目， 来自10个学术和政府研究机构的调查人员 机构职能体系 这项研究是根据 NSF Coastal Ocean Processes（CoOP） 以及美国国家海洋和大气管理局沿海海洋计划。 这项为期5年的合作研究计划将侧重于 事件对近岸-近海的重要性 运输和随后的生态后果。研究 试图1）确定什么过程控制生物的跨界（近岸到离岸）运输， 化学和地质材料在沿海边缘 五大湖，并2）开发和测试科学 评估、量化和预测的战略 自然和人为的多重压力的影响， 在五大湖或选定的沿海次区域。 受污染沉积物与 上覆水通过沉积物再悬浮过程存在于湖泊和沿海生态系统中。卫星 密歇根湖的观测表明， 近岸-近海输送的反复发作，10公里 一股延伸超过200公里的再悬浮物质 沿着湖的南岸。初步证据 表明这一幕式事件可能是 湖泊跨界输沙机制 密歇根 这种类型的事件影响回收利用， 重要地球化学物质（BIMS），生态系统 响应，跨等深线运输在五大湖。的 计划结果将适用于许多类似事件 沿海地区 这一全面的跨学科研究将实施 一个综合的观测程序和数值模拟 努力识别、量化和开发预测工具 冬春季再悬浮事件，并评估 这一事件对运输和转化的影响， BIMS和湖泊生态。 本研究的这一部分侧重于了解 控制浮游植物的生理生态机制， 在偶发性物理强迫事件期间的群落结构 在五大湖内。 细胞的测量， 物种、群体和群落过程加上最先进的生物光学仪器将允许 独特的全面检查的分类具体和 社区对不同物理强迫因素的反应。 工作还将进一步发展、评估和改进 密歇根湖目前的生物光学生产模型， 协助开发淡水遥感 算法