Journal article
Submarine groundwater discharge impacts on coastal nutrient biogeochemistry
Nature Reviews. Earth & Environment, Vol.2(5), pp.307-323
05/2021
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Abstract
Submarine groundwater discharge (SGD) links terrestrial and marine systems, but has often been overlooked in coastal nutrient budgets because it is difficult to quantify. In this Review, we examine SGD nutrient fluxes in over 200 locations globally, explain their impact on biogeochemistry and discuss broader management implications. SGD nutrient fluxes exceed river inputs in ~60% of study sites, with median total SGD fluxes of 6.0 mmol m−2 per day for dissolved inorganic nitrogen, 0.1 mmol m−2 per day for dissolved inorganic phosphorus and 6.5 mmol m−2 per day for dissolved silicate. SGD nitrogen input (mostly in the form of ammonium and dissolved organic nitrogen) often mitigates nitrogen limitation in coastal waters, since SGD tends to have high nitrogen concentrations relative to phosphorus (76% of studies showed N:P values above the Redfield ratio). It is notable that most investigations do not distinguish saline and fresh SGD, although they have different properties. Saline SGD is a ubiquitous, diffuse pathway releasing mostly recycled nutrients to global coastal waters, whereas fresh SGD is occasionally a local, point source of new nutrients. SGD-derived nutrient fluxes must be considered in water quality management plans, as these inputs can promote eutrophication if not properly managed.
Details
- Title
- Submarine groundwater discharge impacts on coastal nutrient biogeochemistry
- Creators
- Isaac R Santos - University of GothenburgXiaogang Chen - Westlake UniversityAlanna L Lecher - Lynn UniversityAudrey H Sawyer - The Ohio State UniversityNils Moosdorf - Leibniz Centre for Tropical Marine ResearchValentí Rodellas - Universitat Autònoma de BarcelonaJoseph Tamborski - Old Dominion UniversityHyung-Mi Cho - Inha UniversityNatasha Dimova - University of AlabamaRyo Sugimoto - Fukui Prefectural UniversityStefano Bonaglia - University of GothenburgHailong Li - Southern University of Science and TechnologyMithra-Christin Hajati - Leibniz Centre for Tropical Marine ResearchLing Li - Westlake University
- Publication Details
- Nature Reviews. Earth & Environment, Vol.2(5), pp.307-323
- Publisher
- Nature Publishing Group
- Identifiers
- 991012948480202368
- Copyright
- Copyright © 2021, Springer Nature Limited
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; National Marine Science Centre; Science
- Language
- English
- Resource Type
- Journal article