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Arctic boundary layer nitrogen oxides (NOx = NO2 + NO) arenaturally produced in and released from the sunlit snowpack and rangebetween 10 to 100 pptv in the remote background surface layer air. Thesenitrogen oxides have significant effects on the partitioning and cycling ofreactive radicals such as halogens and HOx (OH + HO2). However,little is known about the impacts of local anthropogenic NOx emissionsources on gas-phase halogen chemistry in the Arctic, and this is importantbecause these emissions can induce large variability in ambient NOx andthus local chemistry. In this study, a zero-dimensional photochemicalkinetics model was used to investigate the influence of NOx on theunique springtime halogen and HOx chemistry in the Arctic. Trace gasmeasurements obtained during the 2009 OASIS (Ocean – Atmosphere – SeaIce – Snowpack) field campaign at Barrow, AK were used to constrain many modelinputs. We find that elevated NOx significantly impedes gas-phasehalogen radical-based depletion of ozone, through the production of avariety of reservoir species, including HNO3, HO2NO2,peroxyacetyl nitrate (PAN), BrNO2, ClNO2 and reductions in BrO andHOBr. The effective removal of BrO by anthropogenic NOx was directlyobserved from measurements conducted near Prudhoe Bay, AK during the 2012Bromine, Ozone, and Mercury Experiment (BROMEX). Thus, while changes insnow-covered sea ice attributable to climate change may alter theavailability of molecular halogens for ozone and Hg depletion, predictingthe impact of climate change on polar atmospheric chemistry is complex andmust take into account the simultaneous impact of changes in thedistribution and intensity of anthropogenic combustion sources. This isespecially true for the Arctic, where NOx emissions are expected toincrease because of increasing oil and gas extraction and shippingactivities

atmospheric chemistry and physics

The NO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;x&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt; dependence of bromine chemistry in the Arctic atmospheric boundary layer