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BG | Articles | Volume 17, issue 19
Biogeosciences, 17, 4919–4936, 2020
https://doi.org/10.5194/bg-17-4919-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Ocean deoxygenation: drivers and consequences – past, present...

Biogeosciences, 17, 4919–4936, 2020
https://doi.org/10.5194/bg-17-4919-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 Oct 2020

Research article | 14 Oct 2020

Effects of 238U variability and physical transport on water column 234Th downward fluxes in the coastal upwelling system off Peru

Ruifang C. Xie et al.

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Cited articles

Abernathey, R. P. and Marshall, J.: Global surface eddy diffusivities derived from satellite altimetry, J. Geophys. Res.-Oceans, 118, 901-916, https://doi.org/10.1002/jgrc.20066, 2013. 
Anderson, R. F., Fleisher, M. Q., and LeHuray, A. P.: Concentration, oxidation state, and particulate flux of uranium in the Black Sea, Geochim. Cosmochim. Ac., 53, 2215–2224, https://doi.org/10.1016/0016-7037(89)90345-1, 1989. 
Arthur, M. A., Dean, W. E., and Laarkamp, K.: Organic carbon accumulation and preservation in surface sediments on the Peru margin, Chem. Geol., 152, 273–286, https://doi.org/10.1016/S0009-2541(98)00120-X, 1998. 
Bacon, M., Cochran, J., Hirschberg, D., Hammar, T., and Fleer, A.: Export flux of carbon at the equator during the EqPac time-series cruises estimated from 234Th measurements, Deep-Sea Res. Pt. II, 43, 1133–1153, https://doi.org/10.1016/0967-0645(96)00016-1, 1996. 
Barnes, C. and Cochran, J.: Uranium removal in oceanic sediments and the oceanic U balance, Earth Planet. Sc. Lett., 97, 94–101, https://doi.org/10.1016/0012-821X(90)90101-3, 1990. 
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Thorium-234 (234Th) is widely used to study carbon fluxes from the surface ocean to depth. But few studies stress the relevance of oceanic advection and diffusion on the downward 234Th fluxes in nearshore environments. Our study in offshore Peru showed strong temporal variations in both the importance of physical processes on 234Th flux estimates and the oceanic residence time of 234Th, whereas salinity-derived seawater 238U activities accounted for up to 40 % errors in 234Th flux estimates.
Thorium-234 (234Th) is widely used to study carbon fluxes from the surface ocean to depth. But...
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