Effect of Barometric Pressure Fluctuations on Gas Transport over Soil Surfaces

Molar diffusion mechanism is generally considered to be the main physical process of gas transport at soil–atmosphere interface. However, advection in porous medium can considerably affect soil transport. Barometric pressure fluctuations caused by pumps one factors that affects mechanism. Most existing studies are overly focused on construction complex mathematical models and cannot exclude other environmental from interfering. In present study, a simple attenuation form barometric was explored as “minimum unit” wave laboratory. A model (PAM) developed verify relationship between difference emission surface measuring change attenuation. The effect fluxes then quantified based calculated fluxes. addition, properties also analyzed. results show air cause CO2 an order magnitude (change 1 Pa result approximately 100% flux for sandy loam). sensitivity different differences positively correlated with permeability, which property influences response fluctuations. These provide important prerequisites quantifying more future study.