NOy removal from the Cumberland Power Plant Plume |
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| Institution: | 1. Centre for Regenerative Medicine, Institute for Regeneration and Repair, The University of Edinburgh, Edinburgh EH16 4UU, UK;2. UK Dementia Research Institute at UCL, University College London, London, UK;1. The University of Queensland, Advanced Water Management Centre, St Lucia, QLD 4072, Australia;2. College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China;3. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China;1. Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China;2. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China;3. School of Environmental Science and Engineering, Shandong University, Qingdao 266237, PR China;4. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA |
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| Abstract: | Airborne measurements were performed in the plume of the Cumberland Power Plant during August 1998 using a highly sensitive SO2 instrument. The measurements confirmed previous suggestions that NOy species are removed from the plume at a faster rate than SO2. The differential removal rate (the difference between loss rate of NOy and that of SO2) was estimated to be 0.06 h?1. This value implies that the NOy loss rate is in the range of 0.09–0.14 h?1. The application of a mathematical argument, based on the convolution integral, enabled improved synchronization of the data from the SO2 and NOy instruments. Examination of the synchronized data revealed that the concentration ratio of SO2 and NOy varies across the plume. Near the source it is higher at the wings of the plume, while in the core of the plume it is similar to the ratio at the release point. Two possible explanations of the observations are discussed: conversion to non-measurable NOy species, and in-plume loss of NOy (as HNO3) via dry deposition. |
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