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

摘要：本研究的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海洋表面固定碳和氮物种的循环，并在实验室和野外实验的基础上，模拟这些化学物质在浮游植物营养结构、病毒裂解、微、大型浮游动物放牧和细菌异养介导的群落演替和衰老。一系列假设，包括溶解有机碳（DOC）和氮（DON）化合物的生产和消耗，将在切萨皮克湾河口和蒙特雷湾沿海上升流主导的对比物理系统的一系列可操作培养实验和季节性巡航计划中进行测试。建模目标包括实地和培养实验的机械信息模拟，能够描述和预测DOC和DON组成、分子量和生物利用度作为营养结构和复杂性的函数。相关的教育活动将围绕突出当前由弗吉尼亚海洋科学研究所迷你学校项目协调的公共教育项目背景下多学科调查的研究成果。这个现有的课程开发计划具有密集的参与性和外联性组成部分，并建议扩大公众了解当代科学问题的机会，例如海洋环境系统中的生物复杂性是如何被研究科学家所处理的。

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.