Abstract
This study was designed to identify major atmospheric HONO sources that trigger the accumulation of ozone by generating OH radicals through its photolysis. We measured HONO in the atmosphere using the PPDS-IC system and found that HONO concentration was 2.61 ± 1.91 ppb in the winter and 1.8 ± 0.76 ppb in the summer. Regardless of seasons, HONO concentration tended to be proportional to the NO2 level, and the HONO/NO2 ratio was greatly influenced by relative humidity. The conversion rate of HONO from NO2 was similar in winter and summer, but the variation of HONO in winter was larger than that of summer. Although the photolysis rate of HONO was lower in the winter, but the OH production rate was larger in the winter due to its higher concentrations observed. In addition to nighttime heterogeneous production with NO2, unknown sources played the very important role in the HONO budget, especially in the daytime and they should be resolved in future studies.
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