Using eddy correlation to measure oxygen flux as an indicator of the health of aquatic systems

水输送溶解的气体（例如，氧气; O2）、营养物和其他化学物质进出河流和湖泊沉积物和水生生物，以及对它们施加水动力。了解溶解O2通过生物和地球化学过程的命运和转移对于了解水生生态系统的功能以及修复/恢复至关重要。涡流相关技术，它测量O2浓度在最小的湍流，提供了一个精确的测量O2通量。使用涡流相关测量氧通量对于实现这些目标至关重要，但我现有的涡流相关系统（RTI于2007年资助）已经过时，无法修复。这限制了我实验室成员的研究机会。 为了恢复我的实验室的基本能力，我请求支持购买替代涡流相关系统。所要求的系统使用一个光纤氧传感器来测量O2沿着与快速响应PAR光记录仪，多参数探测器，和一个声学多普勒电流剖面测量环境条件在涡流相关测量。所要求的系统使用基于光学的氧传感器，与旧的、现已过时的型号中使用的电化学传感器相比，这种传感器更耐用，搅拌敏感性更低。因此，新的系统将大大提高我们的能力，检查的命运和转移的一个关键的生物地球化学成分在水生环境中。 本文所提出的涡流相关系统是我的研究项目所急需的。没有它，我们就无法确定湖泊中低氧水平（缺氧）的原因，濒危淡水贻贝物种的健康以及水生植被的生产力。此外，我们不能推进我们的生态水文模型从实验室到现场。拟议中的设备对我的NSERC发现研究计划至关重要，并将支持与省级和联邦机构研究伙伴的重要合作。这些活动特别重要，因为人们对水质下降感到关切（例如，缺氧或低氧），并要求恢复这些水生生态系统，为加拿大人提供经济和生态效益。

Water transports dissolved gases (e.g., oxygen; O2), nutrients, and other chemicals to and from river and lake sediments and aquatic organisms, as well as imparting hydrodynamic forces on them. Understanding the fate and transfer of dissolved O2 through biological and biogeochemical processes is essential to understanding the functioning of aquatic ecosystems as well as their remediation/recovery. The eddy correlation technique, which measures O2 concentration in the smallest turbulent, provides an accurate measurement of O2 flux. Measuring oxygen flux using eddy correlation is essential to achieve these goals, but my existing eddy correlation system (RTI funded in 2007) is obsolete and beyond repair. This has limited the research opportunities available to members of my lab.      To restore this essential capacity to my lab, I am requesting support to purchase a replacement eddy correlation system. The requested system uses a fibre--optic oxygen sensor to measure O2 along with a fast response PAR light logger, multiparameter sonde, and an acoustic Doppler current profiler to measure environmental conditions during eddy correlation measurements. The requested system uses optical--based oxygen sensors, which are more robust and less stirring sensitive than the electrochemical sensors used in older, now-obsolete models. Consequently, the new system will significantly advance our ability to examine the fate and transfer of a key biogeochemical constituent in aquatic environments.      The proposed eddy correlation system is urgently needed by my research program. Without it, we are unable to determine the causes of low oxygen levels (hypoxia) in lakes, the health of endangered freshwater mussel species, and the productivity of aquatic vegetation. Moreover, we are not able to advance our ecohydrological models from the laboratory to the field. The proposed equipment is essential to my NSERC Discovery research program and will support important collaborations with research partners in provincial and federal agencies. These activities are of particular importance because of concerns about declining water quality (e.g., hypoxia or low oxygen), and demands to restore these aquatic ecosystems to provide economic and ecological benefits to Canadians.