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. Author manuscript; available in PMC: 2020 Jul 23.
Published in final edited form as: Atmos Chem Phys. 2017 Dec 12;17(23):14747–14770. doi: 10.5194/acp-17-14747-2017

Figure 3.

Figure 3.

The gaseous fraction of total nitrate versus the molar ratio of total ammonia to total nitrate (ppb) under different environmental conditions (blue lines). The total ammonia is the sum of NH3(g) measured on P3-B close to ground (< 20 m AGL) and NH4+(p) at ground-level measured by PILS at approximately same time. The total nitrate is the NO3-(g+p) measured by TD-LIF close to ground (< 20 m AGL). The grey dashed arrow indicates the observed range of molar ratio values during the campaign period. The total (gas + particle) ammonia is shown for reference (orange line).