文章基本信息

标题：Assessment of field monitoring of plant fluxes of oxidized nitrogen with two types of detectors
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作者：Maarit Raivonen ; Johanna Joensuu ; Petri Keronen 等
期刊名称：Boreal Environment Research
印刷版ISSN：1239-6095
出版年度：2014
卷号：19
页码：20-34
语种：English
出版社：Finnish Limnological Society
摘要：Chemiluminescence-based measurements of oxidized nitrogen can be specific to NOx or can also detect other NOy compounds, depending on the equipment. We monitored chamber fluxes of oxidized nitrogen in Scots pine shoots under field conditions, and changed from a NOy measurement to the more NOx-specific measurement. The aims of this study were to evaluate how the NOx measurement system performs in comparison with the NOy measurement system in dynamic field measurements, and whether the new measurements provide information on the composition of the NOy emissions reported in earlier studies. We found that absolute NOx concentrations were slightly more inaccurate than the earlier NOy concentrations but that the new analyzer led to an improvement in the measurement of NOx fluxes. Simultaneous NOy and NOx flux measurements from chambers indicated that the measured NOy fluxes often include compounds other than NOx. We found no clear plant-related NOx emissions.