Atmospheric Composition Modelling
Surface-atmosphere exchange is the exchange of water vapor, energy and trace species (including gaseous chemicals and atmospheric particles) between the atmosphere and the Earth’s surface. The energy balance at the surface and vegetative evapotranspiration drive atmospheric dynamics (weather and climate) and are key to understanding the water cycle. Exchange (emission and/or uptake) of trace gaseous species (e. g., methane, nitrogen oxides, biogenic hydrocarbons, carbon dioxide) is critical for understanding various issues in climate, air quality and ecosystem dynamics. Interactions between the physics and chemistry of the atmosphere and the biology and ecology of the biosphere are vital for accurate predictive computational models. Deposition (both wet and dry) of gases and particles is the major removal mechanism for many atmospheric trace species and may alter chemical balances of sensitive ecosystems. These kinds of processes drive much of what happens in the lower atmosphere and thereby affect weather, climate and air quality. Scientists at ARL perform research in surface-atmosphere exchange to better understand how these processes influence the behavior of the atmosphere and affect our daily lives through the weather and climate we experience and the air we breathe.