Dry Particulate Nitrate Deposition in China

A limited number of ground measurements of dry particulate nitrate deposition (NO) makes it difficult and challenging to fully know the status of the spatial and temporal variations of dry NO depositions over China. This study tries to expand the ground measurements of NO concentrations at monitoring sites to a national scale, based on the Ozone Monitoring Instrument (OMI) NO columns, NO 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 NO depositions on a regional scale based on an inferred model. The ground NO concentrations were first derived from NO columns and the NO profiles, and then the ground NO concentrations were derived from the ground NO concentrations and the relationship between NO and NO based on Chinese Nationwide Nitrogen Deposition Monitoring Network (NNDMN). This estimated dry NO depositions over China will be helpful in determining the magnitude and pollution status in regions without ground measurements, supporting the construction plan of environmental monitoring in future.