A database of modeled gridded dry deposition velocities for 45 gaseous species and three particle size ranges across North America.

The dry deposition process refers to the flux loss of an atmospheric pollutant due to uptake of the pollutant by the earth's surfaces. Dry deposition flux of a chemical species is typically calculated as the product of its surface-layer concentration and its dry deposition velocity (V _d ). Field measurement based V _d data are very scarce or do not exist for many chemical species considered in chemistry transport models. In the present study, gaseous and particulate dry deposition schemes were applied to generate a database of hourly V _d for 45 gaseous species and three particle size ranges for two years (2016-2017) at a 15 km by 15 km horizontal resolution across North America. Hourly V _d of the 45 gaseous species ranged from < 0.001 to 4.6 cm/sec across the whole domain, with chemical species-dependent median (mean) values being in the range of 0.018-1.37 cm/sec (0.05-1.43 cm/sec). The spatial distributions of the two-year average V _d showed values higher than 1-3 cm/sec for those soluble and reactive species over certain land types. Soluble species have the highest V _d over water surfaces, while insoluble but reactive species have the highest V _d over forests. Hourly V _d of PM _2.5 across the whole domain ranged from 0.039 to 0.75 cm/sec with median (mean) value of 0.18 (0.20) cm s ^-1 , while the mean V _d for PM _2.5-10 is twice that of PM _2.5 . Uncertainties in the modeled V _d are typically on the order of a factor of 2.0 or larger, which needs to be considered when applying the dataset in other studies.
(Copyright © 2022. Published by Elsevier B.V.)