Formatian Mechanism for High Concentrations of NO<SUB>2</SUB> over a Nocturnal Urban Area
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概要
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The formation mechanism for high concentrations of NO<SUB>2</SUB> over a nocturnal urban area was analyzed based on the field observation data collected at Sapporo in November 1984. In the nocturnal urban area, the NO<SUB>2</SUB>/NO<SUB>x</SUB> ratio increased with height and was proportional to O<SUB>3</SUB> concentration. The vertical NO<SUB>2</SUB> concentration profile was formed through a combination of turbulent diffusion and chemical reaction (NO with O<SUB>3</SUB>), and the vertical gradient of NO<SUB>2</SUB> was very small throughout the nocturnal period. The data analysis showed that 8.3% of NO<SUB>2</SUB> was directly emitted from sources and about 85% of observed ambient NO<SUB>2</SUB> may be caused from the reaction of NO+O<SUB>3</SUB>→ NO<SUB>2</SUB>+0<SUB>2</SUB>. Furthermore, the vertical profile of NO<SUB>2</SUB>+O<SUB>3</SUB> was nearly uniform. These vertical profiles of air pollutants (NO, NO<SUB>2</SUB> and O<SUB>3</SUB>) are important for the understanding nocturnal NO<SUB>2</SUB> problem. In addition, background levels of O<SUB>3</SUB> and the role of turbulent diffusion in urban areas are significant factors in establishing appropriate environmental standards for NO<SUB>2</SUB>.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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