Role of oceanic ozone deposition in explaining temporal variability in surface ozone at High Arctic sites

Abstract. Dry deposition is an important removal mechanism for tropospheric ozone (O3). Currently, O3 to oceans in atmospheric chemistry and transport models (ACTMs) generally represented using constant surface uptake resistances. This occurs despite the role of solubility, waterside turbulence reacting with ocean water reactants such as iodide resulting substantial spatiotemporal variability concentrations marine boundary layers. We hypothesize that Arctic Ocean, having a relatively low reactivity, overestimated current consequences concentrations, lifetime long-range O3. investigate impact representation oceanic simulated magnitude have integrated Coupled Ocean-Atmosphere Response Experiment Gas transfer algorithm (COAREG) into mesoscale meteorology model Polar-WRF-Chem (WRF) which introduces dependence on physical biogeochemical drivers deposition. Also, we reduced sea ice snow. Here, evaluate WRF CAMS reanalysis data against hourly averaged observations at 25 sites (latitudes > 60? N). first time coupled modeling system has been evaluated pan-Arctic study sensitivity temporal scheme. find it nudge ECMWF ERA5 ensure adequate meteorological conditions show mechanistic over snow/ice improves mixing ratios both compared resistance approach. Using COAREG, velocities are order 0.01 cm s?1 ? 0.05 The monthly mean spatial approach (0.01 0.018 s?1) expresses chemical enhancement dissolved iodide, whereas (up ±20 % around mean) mainly differences turbulent transport. bias six above 70? N from ?3.8 0.3 ppb revision Our confirms high-latitude ACTMs. recommend preferred ACTMs improve modeled terms variability.