Fig. 1: Schematic graph of internal cycling and external cycling of NO and HONO. | Nature Communications

Fig. 1: Schematic graph of internal cycling and external cycling of NO and HONO.

From: Synthesizing evidence for the external cycling of NOx in high- to low-NOx atmospheres

Fig. 1: Schematic graph of internal cycling and external cycling of NO and HONO.The alternative text for this image may have been generated using AI.

The left reaction scheme describes internal cycling between nitrogen oxides (NO = NO + NO) and nitrous acid (HONO) in high- NO atmospheres. HONO photolysis is the major route producing OH radical (OH). The right reaction scheme describes external cycling among oxidative reservior species of NO (NO), NO, and HONO in low-NO atmospheres. NO -catalysed radical chain propagration takes over as the major route perturbing OH and ozone (O) chemical production.

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