Extended Data Table 2 Natural, anthropogenic and anthropogenically amplified natural emissions of chlorine, bromine and iodine

From: Natural short-lived halogens exert an indirect cooling effect on climate

  1. &The global annual mean source strength for SLH is computed as follows: SLHCl = CHCl3 + CH2Cl2 + C2Cl4 + C2H4Cl2 + C2HCl3 + CH2BrCl + CH2ICl + CHBrCl2 + CHBr2Cl; SLHBr = CHBr3 + CH2Br2 + CH2BrCl + CH2IBr + CHBrCl2 + CHBr2Cl; SLHI = CH3I + CH2I2 + CH2ICl + CH2IBr; while the total inorganic halogen abundance is defined as: Cly = Cl + Cl2 + ClO + OClO + Cl2O2 + HCl + HOCl + ClONO2 + ClNO2 + BrCl + ICl; Bry = Br + Br2 + BrO + HBr + HOBr + BrONO2 + BrNO2 + BrCl + IBr; Iy = 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.
  2. £Note that the NoSLH scheme does not include iodine chemistry but considers long-lived chlorine and bromine.
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