Just to confirm, Does "Pg C yr⁻¹" mean "Peta grams Carbon per Year"? It's the mass of only "C" or the mass of "CO2"? (There is like a x3 difference, 12 vs 44.

Just to confirm, Does "Pg C yr⁻¹" mean "Peta grams Carbon per Year"? It's the mass of only "C" or the mass of "CO2"? (There is like a x3 difference, 12 vs 44. Probably not very relevant, but I'd like to understand the meaning correctly.)