Radium tracing nutrient inputs through submarine groundwater discharge in the global ocean
Cho, Hyung-Mi (Seoul National University)
Kim, Guebuem (Seoul National University)
Kwon, Eun Young (Pusan National University)
Moosdorf, Nils (Leibniz Center for Tropical Marine Ecology)
Garcia-Orellana, Jordi (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Santos, Isaac (Southern Cross University)
Universitat Autònoma de Barcelona. Departament de Física

Date:	2018
Abstract:	Riverine and atmospheric inputs are often considered as the main terrestrial sources of dissolved inorganic nitrogen (DIN), phosphorus (DIP), and silicon (DSi) in the ocean. However, the fluxes of nutrients via submarine groundwater discharge (SGD) often exceed riverine inputs in different local and regional scale settings. In this study, we provide a first approximation of global nutrient fluxes to the ocean via total SGD, including pore water fluxes, by combining a global compilation of nutrient concentrations in groundwater and the SGD-derived 228 Ra fluxes. In order to avoid overestimations in calculating SGDderived nutrient fluxes, the endmember value of nutrients in global groundwater was chosen from saline groundwater samples (salinity >10) which showed relatively lower values over all regions. The results show that the total SGD-derived fluxes of DIN, DIP, and DSi could be approximately 1. 4-, 1. 6-, and 0. 7-fold of the river fluxes to the global ocean (Indo-Pacific and Atlantic Oceans), respectively. Although significant portions of these SGD-derived nutrient fluxes are thought to be recycled within sediment-aquifer systems over various timescales, SGD-derived nutrient fluxes should be included in the global ocean budget in order to better understand dynamic interactions at the land-ocean interface.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1356
Note:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Scientific reports, Vol. 8 (February 2018) , art. 2439, ISSN 2045-2322

DOI: 10.1038/s41598-018-20806-2
PMID: 29403050

7 p, 1.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut de Ciència i Tecnologia Ambientals (ICTA)
Articles > Research articles
Articles > Published articles