Change Date: 22 Mar 2017, 12:03 p.m.
surface_downward_mass_flux_of_carbon13_dioxide_expressed_as_carbon13_due_to_abiotic_component kg m-2 s-1 [KSP2] 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 phrase "expressed_as" is used in the construction A_expressed_as_B, where B is a chemical constituent of A. It means that the quantity indicated by the standard name is calculated solely with respect to the B contained in A, neglecting all other chemical constituents of A. The specification of a physical process by the phrase "due_to_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. Carbon13 is a stable isotope of carbon having six protons and seven neutrons.