Articles | Volume 17, issue 19
https://doi.org/10.5194/bg-17-4919-2020
https://doi.org/10.5194/bg-17-4919-2020
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, Frédéric A. C. Le Moigne, Insa Rapp, Jan Lüdke, Beat Gasser, Marcus Dengler, Volker Liebetrau, and Eric P. Achterberg

Related authors

Regulation of nitrous oxide production in low-oxygen waters off the coast of Peru
Claudia Frey, Hermann W. Bange, Eric P. Achterberg, Amal Jayakumar, Carolin R. Löscher, Damian L. Arévalo-Martínez, Elizabeth León-Palmero, Mingshuang Sun, Xin Sun, Ruifang C. Xie, Sergey Oleynik, and Bess B. Ward
Biogeosciences, 17, 2263–2287, https://doi.org/10.5194/bg-17-2263-2020,https://doi.org/10.5194/bg-17-2263-2020, 2020
Short summary

Related subject area

Biogeochemistry: Stable Isotopes & Other Tracers
Position-specific kinetic isotope effects for nitrous oxide: a new expansion of the Rayleigh model
Elise D. Rivett, Wenjuan Ma, Nathaniel E. Ostrom, and Eric L. Hegg
Biogeosciences, 21, 4549–4567, https://doi.org/10.5194/bg-21-4549-2024,https://doi.org/10.5194/bg-21-4549-2024, 2024
Short summary
Technical note: A Bayesian mixing model to unravel isotopic data and quantify trace gas production and consumption pathways for time series data – Time-resolved FRactionation And Mixing Evaluation (TimeFRAME)
Eliza Harris, Philipp Fischer, Maciej P. Lewicki, Dominika Lewicka-Szczebak, Stephen J. Harris, and Fernando Perez-Cruz
Biogeosciences, 21, 3641–3663, https://doi.org/10.5194/bg-21-3641-2024,https://doi.org/10.5194/bg-21-3641-2024, 2024
Short summary
Separating above-canopy CO2 and O2 measurements into their atmospheric and biospheric signatures
Kim A. P. Faassen, Jordi Vilà-Guerau de Arellano, Raquel González-Armas, Bert G. Heusinkveld, Ivan Mammarella, Wouter Peters, and Ingrid T. Luijkx
Biogeosciences, 21, 3015–3039, https://doi.org/10.5194/bg-21-3015-2024,https://doi.org/10.5194/bg-21-3015-2024, 2024
Short summary
How long does carbon stay in a near-pristine central Amazon forest? An empirical estimate with radiocarbon
Ingrid Chanca, Ingeborg Levin, Susan Trumbore, Kita Macario, Jost Lavric, Carlos Alberto Quesada, Alessandro Carioca de Araújo, Cléo Quaresma Dias Júnior, Hella van Asperen, Samuel Hammer, and Carlos Sierra
EGUsphere, https://doi.org/10.5194/egusphere-2024-883,https://doi.org/10.5194/egusphere-2024-883, 2024
Short summary
Errors associated with calculating the gross nitrification rates in forested catchments using the triple oxygen isotopic composition (Δ17O) of stream nitrate
Weitian Ding, Urumu Tsunogai, and Fumiko Nakagawa
EGUsphere, https://doi.org/10.5194/egusphere-2023-2753,https://doi.org/10.5194/egusphere-2023-2753, 2023
Short summary

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. 
Download
Short summary
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.
Altmetrics
Final-revised paper
Preprint