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ACP | Articles | Volume 20, issue 7
Atmos. Chem. Phys., 20, 4255–4273, 2020
https://doi.org/10.5194/acp-20-4255-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 20, 4255–4273, 2020
https://doi.org/10.5194/acp-20-4255-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

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. 
Alexander, B., Allman, D., Amos, H., Fairlie, T., Dachs, J., Hegg, D. A., and Sletten, R. S.: Isotopic constraints on the formation pathways of sulfate aerosol in the marine boundary layer of the subtropical northeast Atlantic Ocean, J. Geophys. Res.-Atmos., 117, https://doi.org/10.1029/2011JD016773, 2012. 
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. 
Ault, W. U. and Kulp, J.: Isotopic geochemistry of sulphur, Geochim. Cosmochim. Ac., 16, 201–235, 1959. 
Au Yang, D., Landais, G., Assayag, N., Widory, D., and Cartigny, P.: Improved analysis of micro-and nanomole-scale sulfur multi-isotope compositions by gas source isotope ratio mass spectrometry, Rapid Commun. Mass Spectrom., 30, 897–907, 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.
Given their critical impact on radiative forcing, sulfate aerosols have been extensively studied...
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