In recent years, with the development of industrialization and urbanization, ecological environment problems have been paid more attention in China, especially in atmospheric environments. Wetlands play a significant role in removing pollutants from the atmosphere via dry deposition. However, it is unrealistic for some places to carry out field collections. In order to seek a feasible and credible way to estimate the dry deposition of wetland, a particle dry deposition model for natural water was used to calculate the atmospheric dry deposition on the Cuihu Wetland of Beijing on the basis of the data of concentrations of particles, wind speed, temperature, and relative humidity. In addition, the atmospheric dry deposition fluxes and deposition velocities were simultaneously measured using a knife-edge surrogate surface, which has a sharp leading edge. The observed and modeled values were compared.
Results shows that SO₄²⁻, NO₃⁻, NH₄⁺ and Cl⁻ were the major components of water-soluble ions in the atmosphere. The mass concentration ratio of NO₃⁻/SO₄²⁻ shows that stationary source emissions are more important than vehicle emissions because of the current industrial use of high-sulfur coal during daytime in suburban Beijing. The ratios of the modeled/observed fluxes during daytime and nighttime were 1.38 and 3.47, respectively. The corresponding values during the normal, dry, and wet periods were 1.93, 2.47, and 2.36. The average ratio of the modeled/observed fluxes was 2.32. Thus, it is crucial to further improve both the laboratory and field measurements and analytical methods for the particle deposition to narrow the current uncertainty in the estimates of atmospheric dry deposition. In addition, further studies should be carried out to modify the model to extend its use for the evaluation of dry deposition on the wetlands of Beijing.