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Biogenic volatile organic compounds (BVOCs) can react in the atmosphere toform organic nitrates, which serve as NOx (NO + NO2) reservoirs,impacting ozone and secondary organic aerosol production, the oxidativecapacity of the atmosphere, and nitrogen availability to ecosystems. Toexamine the contributions of biogenic emissions and the formation and fateof organic nitrates in a forest environment, we simulated the oxidation of57 individual BVOCs emitted from a rural mixed forest in northern Michigan.Key BVOC-oxidant reactions were identified for future laboratory and fieldinvestigations into reaction rate constants, yields, and speciation ofoxidation products. Of the total simulated organic nitrates, monoterpenescontributed ~70% in the early morning at ~12 m above theforest canopy when isoprene emissions were low. In the afternoon, whenvertical mixing and isoprene nitrate production were highest, the simulatedcontribution of isoprene-derived organic nitrates was greater than 90% atall altitudes, with the concentration of secondary isoprene nitratesincreasing with altitude. Notably, reaction of isoprene with NO3leading to isoprene nitrate formation was found to be significant (~8% of primary organic nitrate production) during the daytime, andmonoterpene reactions with NO3 were simulated to comprise up to ~83% of primary organic nitrate production at night. Lastly, forestsuccession, wherein aspen trees are being replaced by pine and maple trees,was predicted to lead to increased afternoon concentrations ofmonoterpene-derived organic nitrates. This further underscores the need tounderstand the formation and fate of these species, which have differentchemical pathways and oxidation products compared to isoprene-derivedorganic nitrates and can lead to secondary organic aerosol formation

Contributions of individual reactive biogenic volatile organic compounds to organic nitrates above a mixed forest