Fig. 4: Contour plot of the yields of highly oxygenated organic molecules (HOM) from monoterpene oxidation vs monoterpene and NOx concentration. | Nature Communications

Fig. 4: Contour plot of the yields of highly oxygenated organic molecules (HOM) from monoterpene oxidation vs monoterpene and NOx concentration.

From: NO at low concentration can enhance the formation of highly oxygenated biogenic molecules in the atmosphere

Fig. 4

The observation data of monoterpene and NOx from the SMEAR II boreal forest station58 are used to predict the HOM yield (black points). A series of simulations were conducted with monoterpene concentration varying from 100 to 1800 pptv, and NOx concentration from 0.01 to 100 ppbv. With the assumption NO is solely formed from NO2 photolysis, NO/NO2 varied to follow the observed diurnal cycle at SMEAR II station from almost zero at night to 14.3% at 10 am. We take the daytime average HOM yield as the HOM yield at fixed NOx and monoterpene concentration.

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