surface_downward_mole_flux_of_cfc11 mol m-2 s-1 [M2MS]P07 id: PSJE7HM9 The surface called "surface" means the lower boundary of the atmosphere. "Downward" indicates a vector component which is positive when directed downward (negative upward). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. The chemical formula of CFC11 is CFCl3. The IUPAC name fof CFC11 is trichloro-fluoro-methane.