Pressure fluctuations at the earth’s surface are caused by a variety of atmospheric phenomena. Examples include low frequency barometric pressure variations, high frequency atmospheric turbulence, atmospheric gravity waves, and quasi-static pressure fields created as wind blows over or around topographic features, like buildings, hills, wind breaks, etc. These naturally occurring pressure fields cause air to move in and out of soils, snowpacks, and other permeable media. Consequently, the uptake or release of trace gases from soils and snowpacks is a combination of molecular diffusion and advective flows caused by surface pressure fluctuations. Such pressure forcing has been found to influence the exchange rate of many trace gases from the underlying substrate to the atmosphere. Given the importance of these trace gases to understanding biogeochemical cycling and global change, it is crucial to quantify (as much as possible) any impact these advective flows can have on gas transport within soils and snowpacks.