Nitrate concentrations in snow from remote areas: implication for the global NO x flux

Increased emissions of nitrogen compounds to the atmosphere by human activities have been well documented. However, in order to better quantify these anthropogenic emissions, better knowledge of natural emissions rates must be known. In addition, variation in natural emissions through time should be documented. In this note we present data collected and/or analyzed by us for NO₃ ^– in recent snow from remote regions of the world. We also summarize existing data sets from other remote regions. This is done to establish a better understanding of NO₃ ^– deposition rates in these regions as well as to add more information to our global understanding of NO₃ ^– deposition.