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Sensitivity Study of the Flow-through Dynamic Flux Chamber Technique for the Soil NO Emissions  

Kim Deug-Soo (Atmospheric Environmental Research Department of Environmental Engineering, School of Engineering Kunsan National University)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.21, no.E3, 2005 , pp. 75-85 More about this Journal
Abstract
A mathematical sensitivity analysis of the flow-through dynamic flux chamber technique, which has been utilized usually for various trace gas flux measurement from soil and water surface, was performed in an effort to provide physical and mathematical understandings of parameters essential for the NO flux calculation. The mass balance equation including chemical reactions was analytically solved for the soil NO flux under the steady state condition. The equilibrium concentration inside the chamber, $C_{eq}$, was found to be determined mainly by the balance between the soil flux and dilution of the gas concentration inside the chamber by introducing the ambient air. Surface deposition NO occurs inside the chamber when the $C_{eq}$ is greater than the ambient NO concentration ($C_{0}$) introducing to the chamber; NO emission from the soil occurs when the $C_{eq}$ is less than the ambient NO concentration. A sensitivity analysis of the significance of the chemical reactions of NO with the reactive species (i.e. $HO_{2},/CH_{3}O_{2},/O_{3}$) on the NO flux from soils was performed. The result of the analysis suggests that the NO flux calculated in the absence of chemical reactions and wall loss could be in error ranges from 40 to $85\%$ to the total flux.
Keywords
Sensitivity analysis; Flux measurement; Flux chamber technique; Flow-through dynamic chamber; Soil NO emission;
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