Articles | Volume 14, issue 13
https://doi.org/10.5194/bg-14-3171-2017
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, Laurent Mémery, Olivier Aumont, and Laure Resplandy

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Latest update: 03 Mar 2025
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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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