沉积物-海水界面氧与pH两维分布的双荧光传感技术研究

项目名称： 沉积物-海水界面氧与pH两维分布的双荧光传感技术研究

项目编号： No.41276089

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 于新生

作者单位： 中国海洋大学

项目金额： 84万元

中文摘要： 沉积物的表层成岩作用和物质输送在生物地球化学循环起着重要作用，底栖生物扰动和生理活动加速了孔隙水与上覆水之间的物质交换和能量流动、改变了沉积物-海水界面营养盐、金属元素及有机物的传输通量和转化过程。然而，目前人类对底栖生物扰动在表层沉积物矿化调节作用及对整个生物地球化学循环贡献的认识还处于猜测和定性的阶段，缺乏令人信服的定量化解释。本项目针对平面荧光传感技术在沉积物-海水界面的两维动态变化原位观测中的若干关键问题，开展高灵敏度传感机理的基础研究、成像方法与传感器结构的技术研究、两维溶解氧与pH 实时观测与性能测试的应用研究，皆在研制出沉积物-海水界面双重组分同时检测的高分辨率平面荧光化学传感系统原型，为进一步认识海洋生物扰动对沉积环境的影响及生物地球化学循环的贡献提供新视角和资料；为我国海洋生物地球化学研究、环境问题决策提供新的参数和依据。

中文关键词： 平面光极传感器；溶解氧；pH值；沉积物-海水界面；原位观测

英文摘要： Diagenetic reactions and material transport in surface sediments play a central role in biogeochemical cycling in marine environments. The actives of benthic animals dramatically alter material transport reaction and distribution between sediment and overlying water, such as nutrient exchange across sediment, transport and transformation of metals and organic material. However, the effect of bioturbation on diagenetic processes and biogeochemical cycles has been poorly understood so far. In this project, we proposed to develop a novel planar optical sensing system which allows high-resolution measurements of spatial and temporal dynamics of oxygen and pH distribution simultaneously. The study is focused in fluorosensor, digital imaging system design, information processing and in situ observation, both theoretically and experimentally. The results from this research will be used to provide accurate and quantitative information of benthic biogeochemical processes and effect of sediment environment. It will raise general awareness about the benthic process, and will advance our understanding the effect of sediment interaction on biogeochemical cycle and environmental problems.

英文关键词： planar optode；dissolved oxygen；pH；sediment-water interface；in situ observation