Improving the particle dry deposition scheme in the CMAQ photochemical modeling system.

ABSTRACT: Dry deposition of atmospheric aerosols in large-scale models is a critical, but highly uncertain, sink process with a strong dependence on particle size, meteorological conditions, and land surface properties. This study investigates the particle dry deposition scheme implemented in the standard Community Multiscale Air Quality (CMAQ) model v5.2.1, characterizes its underlying parameterized components with comparison to a similar scheme in a contemporary regional-scale model, and proposes two updated schemes that are then evaluated with available ambient particle deposition velocity (V_d) measurements. Both updated schemes reduce the surprisingly strong dependence of deposition velocity on the aerosol mode width, with one scheme further introducing a dependence on vegetation cove

SUBMITTER: Shu Q 

PROVIDER: S-EPMC11864309 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature