Formation and transport of oxidized reactive nitrogen, ozone, and secondary organic aerosol in Tokyo

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Abstract

Measurements of the major reactive nitrogen species (NO y) i (NO x, peroxyacyl nitrates, HNO 3, and particulate nitrate (NO 3 -), total reactive nitrogen (NO y), volatile organic compounds, OH and HO 2, and organic aerosol were made near the urban center of Tokyo in different seasons of 2003-2004 to study the processes involving oxidized forms of reactive nitrogen and O 3. Generally, NO x constituted the dominant fraction of NO y throughout the seasons. The NO x /NO y and HNO 3 /NO y ratios were lowest and highest, respectively, in summer, owing to the seasonally high OH concentration. The fraction of NO y that remained in the atmosphere after emission (R NOy) decreased with the decrease in the NO x /NO y ratio in summer and fall. It is likely that the median seasonal-diurnal variations Of O x = O 3 + NO 2 were controlled by those of the background O 3 levels, photochemical O 3 formation, and vertical transport. O x showed large increases during midday under stagnant conditions in mid-August 2004. Their in situ production rates calculated by a box model were too slow to explain the observed increases. The high O x was likely due to the accumulation of O x from previous days in the upper part of the boundary layer (BL) followed by transport down to near the surface by mixing after sunrise. Considering the tight correlation between O x and secondary organic aerosol (SOA), it is likely that SOA also accumulated during the course of sea-land breeze circulation in the BL. Copyright 2008 by the American Geophysical Union.

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Kondo, Y., Morino, Y., Fukuda, M., Kanaya, Y., Miyazaki, Y., Takegawa, N., … Koike, M. (2008). Formation and transport of oxidized reactive nitrogen, ozone, and secondary organic aerosol in Tokyo. Journal of Geophysical Research Atmospheres, 113(21). https://doi.org/10.1029/2008JD010134

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