Description:

Air-surface exchange processes are very complex, involving ambient conditions of the species of interest, biochemical conditions of the exchange surface, meteorology, and fast chemical reactions that create discrepancies between leaf- and canopy-scale fluxes. While accurate representations of these processes are critical for atmospheric composition models (including air quality, weather and climate models), wide knowledge gaps persist, particularly for compounds that are exchanged bi-directionally or exhibit high reactivity. Quantifying air-surface exchange and atmospheric deposition of any pollutant is also essential to characterize its mass balance at field (i.e., ecosystem inputs) to global scales. This session is devoted to recent studies on measurements and model/parameterization developments of dry deposition or bi-directional fluxes of inorganic and organic gases, bulk and size-resolved aerosols, short-lived and persistent pollutants, and impacts and effects indicators of atmospheric deposition on various ecosystems. New approaches to modeling the deposition/bi-directional exchange processes, studies on pollutant species that were seldom considered previously, new measurement methods, inter-comparison of different models and different measurement methods, and atmospheric deposition from local, regional to global scales and their impact on ecosystem health are all welcome.