Articles | Volume 18, issue 8
Biogeosciences, 18, 2663–2678, 2021
https://doi.org/10.5194/bg-18-2663-2021

Special issue: Atmospheric deposition in the low-nutrient-low-chlorophyll...

Biogeosciences, 18, 2663–2678, 2021
https://doi.org/10.5194/bg-18-2663-2021
Research article
27 Apr 2021
Research article | 27 Apr 2021

Contrasted release of insoluble elements (Fe, Al, rare earth elements, Th, Pa) after dust deposition in seawater: a tank experiment approach

Matthieu Roy-Barman et al.

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Cited articles

Anderson, R. F., Fleisher, M. Q., Robinson, L., Edwards, R. L., Hoff, J. A., Moran, S. B., Rutgers van der Loeff, M. M., Thomas, A. L., Roy-Barman, M., and Francois, R.: GEOTRACES intercalibration of 230Th, 232Th, 231Pa, and prospects for 10Be, Limnol. Oceanogr.-Meth., 10, 179–213, 2012. 
Anderson, R. F., Cheng, H., Edwards, R. L., Fleisher, M. Q., Hayes, C. T., Huang, K. F., Kadko, D., Lam, P. J., Landing, W. M., Lao, Y., Lu, Y., Measures, C. I., Morton, P. L., Moran, S. B., Robinson, L. F., and Shelley, R. U.: How well can we quantify dust deposition to the ocean?, Philos. T. R. Soc. A, 374, 2015028520150285, https://doi.org/10.1098/rsta.2015.0285, 2016. 
Aghnatios, C., Losno, R., and Dulac, F.: A fine fraction of soil used as an aerosol analogue during the DUNE experiment: sequential solubility in water, decreasing pH step-by-step, Biogeosciences, 11, 4627–4633, https://doi.org/10.5194/bg-11-4627-2014, 2014. 
Arraes-Mescoff, R., Roy-Barman, M., Coppola, L., Souhaut, M., Tachikawa, K., Jeandel, C., Sempéré, R., and Yoro, C.: The behavior of Al, Mn, Ba, Sr, REE and Th isotopes during in vitro degradation of large marine particles, Mar. Chem., 73, 1–19, 2001. 
Azetsu-Scott, K. and Niven, S. E.: The role of transparent exopolymer particles (TEP) in the transport of 234Th in coastal water during a spring bloom, Cont. Shelf Res., 25, 1133–1141, 2005. 
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Short summary
The release of insoluble elements such as aluminum (Al), iron (Fe), rare earth elements (REEs), thorium (Th) and protactinium (Pa) when Saharan dust falls over the Mediterranean Sea was studied during tank experiments under present and future climate conditions. Each element exhibited different dissolution kinetics and dissolution fractions (always lower than a few percent). Changes in temperature and/or pH under greenhouse conditions lead to a lower Th release and a higher light REE release.
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