Chlorine isotopic composition of marine aerosols: Implications for the release of reactive chlorine and HCl cycling rates

Details Chlorine isotopic composition of marine aerosols: Implications for the release of reactive chlorine and HCl cycling rates Chlorine isotopic composition of marine aerosols: Implications for the release of reactive chlorine and HCl cycling rates

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3831v&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 20, p. 3831-3834

Physics

8

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Geochemistry: Isotopic Composition/Chemistry

Scientific paper

We have determined the elemental and the stable chlorine isotopic composition of size-segregated aerosols collected in the marine boundary layer. All size fractions have chlorine deficiencies. Mid-size aerosols are isotopically enriched in δ37Cl and contain significant quantities of non-sea-salt-SO42- and NO3-. This is consistent with the acid displacement of HCl from the aerosols. Coarse aerosols tend to be isotopically depleted and have Cl deficiencies that are not charge balanced by MSA-, SO42- and NO3- with Cl volatilization by a different mechanism. The isotope systematics imply a fractionation factor, α, of 1.00306+/-0.0005 if the volatilization mechanism is first order with respect to Cl or 1.00280+/-0.0005 if the volatilization mechanism is zeroth order with respect to Cl. Our data are consistent with the efficient recycling of aerosol Cl through the gas phase.

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