Dry Particulate Nitrate Deposition in China

A limited number of ground measurements of dry particulate nitrate deposition (NO3–) makes it difficult and challenging to fully know the status of the spatial and temporal variations of dry NO3– depositions over China. This study tries to expand the ground measurements of NO3– concentrations at monitoring sites to a national scale, based on the Ozone Monitoring Instrument (OMI) NO2 columns, NO2 profiles from an atmospheric chemistry transport model (Model for Ozone and Related chemical Tracers, version 4, MOZART-4) and monitor-based sources, and then estimates the NO3– depositions on a regional scale based on an inferred model. The ground NO2 concentrations were first derived from NO2 columns and the NO2 profiles, and then the ground NO3– concentrations were derived from the ground NO2 concentrations and the relationship between NO2 and NO3– based on Chinese Nationwide Nitrogen Deposition Monitoring Network (NNDMN). This estimated dry NO3– depositions over China will be helpful in determining the magnitu...