Articles | Volume 14, issue 13
Biogeosciences, 14, 3171–3189, 2017
https://doi.org/10.5194/bg-14-3171-2017
Biogeosciences, 14, 3171–3189, 2017
https://doi.org/10.5194/bg-14-3171-2017

Research article 04 Jul 2017

Research article | 04 Jul 2017

Improving the inverse modeling of a trace isotope: how precisely can radium-228 fluxes toward the ocean and submarine groundwater discharge be estimated?

Guillaume Le Gland et al.

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AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (Editor review) (08 May 2017) by Jack Middelburg
AR by Guillaume LE GLAND on behalf of the Authors (26 May 2017)  Author's response    Manuscript
ED: Publish subject to technical corrections (02 Jun 2017) by Jack Middelburg
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Short summary
In this study, we computed the fluxes of radium-228 from the continental shelf to the open ocean by fitting a numerical model to observations. After determining appropriate model parameters (cost function and number of source regions), we found a lower and more precise global flux than previous estimates: 8.01–8.49×1023 atoms yr−1. This result can be used to assess nutrient and trace element fluxes to the open ocean, but we cannot identify specific pathways like submarine groundwater discharge.
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