BE/CBC: Quantification and Modeling of DOC and DON Release in Marine Systems: A Study of Increasing Trophic Complexity

BE/CBC：海洋系统中 DOC 和 DON 释放的量化和建模：营养复杂性增加的研究

• 批准号: 0221825
• 负责人: Deborah Bronk
• 金额: $ 169.98万
• 依托单位: College of William & Mary Virginia Institute of Marine Science
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221825&HistoricalAwards=false
• 关键词: CBC; Quantification; Modeling; DOC; DON

ABSTRACTOCE-0221825The study focus is to consider the range of dissolved organic matter (DOM) release processes exhibited by marine phytoplankton species, to describe how these processes regulate and couple to the cycling of fixed carbon and nitrogen species in the surface ocean, and to model, based upon both controlled laboratory and field experiments, the interactions of these chemical species between phytoplankton trophic structure, community succession and senescence as mediated by viral lysis, micro and macrozooplankton grazing and bacterial heterotrophy. A series of hypotheses, involving the production and consumption of dissolved organic carbon (DOC) and nitrogen (DON) compounds, will be tested on each of a series of manipulable culture experiments and a program of seasonal cruises in both estuarine Chesapeake Bay and coastal upwelling dominated Monterey Bay as contrasting physical systems. Modeling objectives include a mechanistically informed simulation of field and culture experiments capable of descriptive and predictive insight as to DOC and DON composition, molecular weight and bio-availability as a function of trophic structure and complexity. Associated educational activities will be centered around highlighting the current research efforts of this multidisciplinary investigation in the context of public education programs coordinated by the Virginia Institute of Marine Sciences Mini-School program. This existing course development program has intensive participatory and outreach components and proposes to expand the opportunities of the pubic to learn about how contemporary scientific issues such as biocomplexity in marine environmental systems are being approached by research scientists.

研究重点是考虑海洋浮游植物物种所表现出的溶解有机物（DOM）释放过程的范围，描述这些过程如何调节和耦合到表层海洋中固定碳和氮物种的循环，并基于受控的实验室和现场实验来模拟这些化学物种在浮游植物营养结构之间的相互作用，群落演替和衰老介导的病毒裂解，微型和大型浮游动物放牧和细菌异养。一系列的假设，涉及溶解的有机碳（DOC）和氮（DON）化合物的生产和消费，将进行测试的一系列可操作的文化实验和一个程序的季节性巡航在河口切萨皮克湾和沿海上升流为主的蒙特雷湾作为对比的物理系统。建模目标包括一个机械通知模拟领域和文化实验能够描述性和预测性的见解DOC和DON的组成，分子量和生物利用度作为营养结构和复杂性的函数。相关的教育活动将集中在突出这一多学科调查的公共教育计划的背景下，由海洋科学迷你学校计划弗吉尼亚研究所协调的当前研究工作。这个现有的课程开发计划有密集的参与和推广组件，并建议扩大公众的机会，了解当代科学问题，如海洋环境系统中的生物复杂性正在由研究科学家处理。