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Nitrogen gas supersaturation in the recent sediments of lake erie and two polluted harbors
Authors:Nicholas J. Fendinger  Donald D. Adams  
Affiliation:1. Applied Mechanics & Vibrations Laboratory, Department of Mechanical Engineering and Aeronautics, University of Patras, Greece (AML, UPAT);2. Mechanical and Aerospace Engineering, Brunel University London, United Kingdom (UBRUN);3. Materials and Structures Centre, Department of Mechanical Engineering, University of Bath, United Kingdom (MAST, UBATH);1. Universidade Federal da Paraíba, Departamento de Engenharia de Produção, Centro de Tecnologia, Campus I, Cidade Universitária, João Pessoa-PB, 58051-970, Brazil;2. Universidade Federal da Paraíba, Departamento de Sistemas de Computação, Centro de Informática, Mangabeira, Rua dos Escoteiros s/n, CEP 58059-900, João Pessoa, Brazil;3. Universidade Federal Fluminense, Departamento de Engenharia de Produção, Rua Passo da Pátria 156, Bloco E - 4° andar, São Domingos, Niterói-RJ, 24210-240, Brazil;1. Environment Canada, 2365 Albert Street, Room 300 Regina, Saskatchewan S4P 4K1, Canada;2. Manitoba Conservation and Water Stewardship, 123 Main Street, Winnipeg, Manitoba R3C 4W2, Canada;3. Saskatchewan Water Security Agency, #101, 108 Research Drive, Saskatoon, Saskatchewan S7N 3R3, Canada;4. Limnology Laboratory, Department of Biology University of Regina, Regina, Saskatchewan S4S 0A2, Canada;1. Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing University, Chongqing 400045, China;2. College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Abstract:Nitrogen gas distributions in sediment pore water were determined for cores collected in Lake Erie and two nearby harbors. Concentrations of N2 gas ranged from 11.9 to 37.0 ml l−1 and from 8.9 to 58.3 ml l−1 for open lake and polluted harbor sediments, respectively. Maximum concentrations in the harbor sediments were as high as 3.5 times N2 saturation calculated for the overlying water. Indirect diffusive flux estimates for nitrogen gas ranged from 20 to 32% of the particulate nitrogen sedimentation rate in Lake Erie. At one location, the amount of nitrogen gas lost by diffusion was calculated to be greater than the nitrogen deposited to the sediments. Nitrogen gas production and diffusive loss from surficial sediments probably represents a major pathway for nitrogen removal from Lake Erie.
Keywords:N2   dinitrogen gas   lake and harbor sediments   denitrification   pore water gases
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