Sentences with phrase «closure removing air»

Processes taken into account included (i) air mixing by pressure and temperature gradients down to a few meters below the surface (i.e., the so - called convection zone); (ii) molecular diffusion in the open pore space and gravitational fractionation (entrainment toward the deeper firn depends on concentration gradients, diffusivities, and molar mass); and (iii) a downward air flux in the open porosity zone due to bubble closure removing air from the open pores.