Articles | Volume 20, issue 7
Atmos. Chem. Phys., 20, 4255–4273, 2020
https://doi.org/10.5194/acp-20-4255-2020
Atmos. Chem. Phys., 20, 4255–4273, 2020
https://doi.org/10.5194/acp-20-4255-2020

Research article 09 Apr 2020

Research article | 09 Apr 2020

Oxygen and sulfur mass-independent isotopic signatures in black crusts: the complementary negative Δ33S reservoir of sulfate aerosols?

Isabelle Genot et al.

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Cited articles

Alexander, B., Park, R. J., Jacob, D. J., Li, Q., Yantosca, R. M., Savarino, J., Lee, C., and Thiemens, M.: Sulfate formation in sea-salt aerosols: Constraints from oxygen isotopes, J. Geophys. Res.-Atmos., 110, https://doi.org/10.1029/2004JD005659, 2005. 
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Amor, M., Busigny, V., Louvat, P., Gélabert, A., Cartigny, P., Durand-Dubief, M., Ona-Nguema, G., Alphandéry, E., Chebbi, I., and Guyot, F.: Mass-dependent and-independent signature of Fe isotopes in magnetotactic bacteria, Science, 352, 705–708, 2016. 
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Short summary
Given their critical impact on radiative forcing, sulfate aerosols have been extensively studied using their isotope signatures (δ34S, ∆33S, ∆36S, δ18O, and ∆17O). A striking observation is that ∆33S > 0 ‰, implying a missing reservoir in the sulfur cycle. Here, we measured ∆33S < 0 ‰ in black crust sulfates (i.e., formed on carbonate walls) that must therefore result from distinct chemical pathway(s) compared to sulfate aerosols, and they may well represent this complementary reservoir.
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