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Measurements of atmospheric nitrogen oxides NOx (NOx D NOC NO2), peroxyacetyl nitrate (PAN), NOy, and non-methane hydrocarbons (NMHC) were taken at the Greenland Environmental Observatory at Sum- mit (GEOSummit) station, Greenland (72.34 N, 38.29 W; 3212 m a.s.l.), from July 2008 to July 2010. The data set represents the first year-round concurrent record of these compounds sampled at a high latitude Arctic site. Here, the study focused on the seasonal variability of these impor- tant ozone (O3) precursors in the Arctic troposphere and the impact from transported anthropogenic and biomass burn- ing emissions. Our analysis shows that PAN is the domi- nant NOy species in all seasons at Summit, varying from 42 to 76 %; however, we find that odd NOy species (odd NOyD NOy PAN NOx) contribute a large amount to the total NOy speciation. We hypothesize that the source of this odd NOy is most likely alkyl nitrates and nitric acid (HNO3) from transported pollution, and photochemically produced species such as nitrous acid (HONO). FLEXPART retroplume analyses and black carbon (BC) tracers for anthropogenic and biomass burning (BB) emis- sions were used to identify periods when the site was im- pacted by polluted air masses. Europe contributed the largest source of anthropogenic emissions during the winter months (November-March) with 56 % of the total anthropogenic BC

Seasonal variability of atmospheric nitrogen oxides and non-methane hydrocarbons at the GEOSummit station, Greenland