Extended Data Table 2.

Natural, anthropogenic and anthropogenically amplified natural emissions of chlorine, bromine and iodine

^&The global annual mean source strength for SLH is computed as follows: SLH^Cl = CHCl₃ + CH₂Cl₂ + C₂Cl₄ + C₂H₄Cl₂ + C₂HCl₃ + CH₂BrCl + CH₂ICl + CHBrCl₂ + CHBr₂Cl; SLH^Br = CHBr₃ + CH₂Br₂ + CH₂BrCl + CH₂IBr + CHBrCl₂ + CHBr₂Cl; SLH^I = CH₃I + CH₂I₂ + CH₂ICl + CH₂IBr; while the total inorganic halogen abundance is defined as: Cl_y = Cl + Cl₂ + ClO + OClO + Cl₂O₂ + HCl + HOCl + ClONO₂ + ClNO₂ + BrCl + ICl; Br_y = Br + Br₂ + BrO + HBr + HOBr + BrONO₂ + BrNO₂ + BrCl + IBr; I_y = I + I₂ + IO + OIO + HI + HOI + IONO₂ + INO₂ + INO + IBr + ICl + I₂O₂ + I₂O₃ + I₂O₄. For total mass computations, only the halogen mass is considered, whereas for the sum of mixing ratios the halogen atomicity for each species is considered.

^£Note that the NoSLH scheme does not include iodine chemistry but considers long-lived chlorine and bromine.