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Keywords:

  • halocarbon;
  • aircraft measurements;
  • Mauritanian upwelling;
  • tropical Atlantic ocean

Very short lived halocarbons (VSLH), including CHBr3, CH2Br2, CHCl3, C2H5I, and CH2ClI, can be transported upward through the atmosphere from the marine boundary layer and contribute to ozone depletion—as far up as the lower stratosphere in the case of brominated and chlorinated compounds. VSLH are released from algae, marine bacteria, and photochemical breakdown of organic material in the ocean, but there are uncertainties in the contributions from these sources, and global distributions are not well known because there are wide spatial variations in fluxes of VSLH from sea to air.