An evaluation of ozone dry deposition simulations in East Asia

Abstract

Abstract. We use a 3-D regional atmospheric chemistry transport model (WRF-Chem) to examine ozone dry deposition in East Asia, which is an important but uncertain research area because of insufficient observation and numerical studies focusing on East Asia. Here we compare two widely used dry deposition parameterization schemes, the Wesely and M3DRY schemes, which are used in the WRF-Chem and Community Multiscale Air Quality (CMAQ) models, respectively. Simulated ozone dry deposition velocities with the two schemes under identical meteorological conditions show considerable differences (a factor of 2) owing to surface resistance parameterization discrepancies. Resulting ozone concentrations differ by up to 10 ppbv for a monthly mean in May when the peak ozone typically occurs in East Asia. An evaluation of the simulated dry deposition velocities shows that the Wesely scheme calculates values with more pronounced diurnal variation than the M3DRY and results in a good agreement with the observations. However, we find significant changes in simulated ozone concentrations using the Wesely scheme but with different surface type data sets, indicating the high sensitivity of ozone deposition calculations to the input data. The need is high for observations to constrain the dry deposition parameterization and its input data to improve the use of air quality models for East Asia.

Coupling dry deposition to vegetation phenology in the Community Earth System Model: Implications for the simulation of surface O3

“…Reported daytime (9:00–15:00 LST) V d as average (minimum‐maximum), avg ± SD or average. Data extracted from Wu et al [], Padro et al [], Padro et al [], Munger et al [], Finkelstein et al [], Kumar et al [], Hole et al [], Mikkelsen et al [], Lamaud et al [], Turnipseed et al [], Park et al [], Fan et al [], Padro et al [], Meyers et al [], and Gao and Wesely [].…”

Toward Synchronous Evaluation of Source Apportionments for Atmospheric Concentration and Deposition of Sulfate Aerosol Over East Asia

“…Owing to the difficulty of measuring dry deposition directly (e.g., Wesely & Hicks, ), the quantitative evaluation of the dry deposition scheme in the regional chemical transport model was limited. As an example, the impact of the dry deposition scheme on springtime ozone concentration was reported in East Asia (Park et al, ); however, similar studies for aerosols in East Asia are limited (Xu & Carmichael, ). Therefore, both dry deposition schemes were used and the differences in dry deposition estimates and atmospheric concentrations were compared.…”

“…Particulate matter (PM), especially matter with aerodynamic diameters of less than 2.5 μm (PM 2.5 ), has attracted great attention due to its association with adverse human health effects . It is expected that exposure to PM will be the most important factor in global premature deaths among selected environmental risks in 2050 (OECD, 2012). East Asia has the highest level of PM 2.5 exposure globally, and half of the population lives in regions where the concentration exceeds 35 μg/m 3 (van Donkelaar et al, 2010), which is the World Health Organization Air Quality Interim Target-1 (WHO, 2005).…”

Interannual variability in ozone removal by a temperate deciduous forest

“…The IAV in 11 years of suggests that model development with short‐term (weeks to a few years) observations over temperate deciduous forests may restrict model representation to capturing the dynamics of solely high or low years. The lack of IAV in models may contribute to intermodel and model‐observation differences that span a factor of 2 in [ Schwede et al ., ; Park et al ., ; Val Martin et al ., ; Hardacre et al ., ]. Understanding the mechanisms responsible for the observed IAV in is crucial to ensure that key processes are incorporated into O 3 deposition parameterizations in the models used to interpret observations and to project changes under emissions and climate scenarios.…”