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Title

Global variability in seawater Mg:Ca and Sr:Ca ratios in the modern ocean

AuthorsLebrato, Mario; Garbe-Schönberg, Dieter; Müller, Marius; Blanco-Ameijeiras, Sonia; Feely, Richard A.; Lorenzoni, Laura; Molinero, Juan Carlos; Bremer, Karen; Jones, Daniel O.B.; Iglesias-Rodríguez, Debora; Greeley, Dana; Lamare, Miles. D.; Paulmier, Aurélien; Graco, Michelle I.; Cartes, Joan Enric CSIC ORCID ; Barcelos e Ramos, Joana; Lara, Ana de; Sánchez Leal, Ricardo; Jimenez, Paz; Paparazzo, Flavio E.; Hartman, Sue E.; Westernströer, Ulrike; Küter, Marie; Benavides, Roberto; Silva, Armindo F. da; Bell, Steven; Payne, Chris; Olafsdottir, Solveig; Robinson, Kelly L.; Jantunen, Liisa M.; Korablev, Alexander; Webster, Richard J.; Jones, Elizabeth M.; Gilg, Olivier; Bailly du Bois, Pascal; Beldowski, Jacek; Ashjian, Carin; Yahia, Nejib D.; Twining, Benjamin S.; Chen, Xue-Gang; Tseng, Li-Chun; Hwang, Jiang-Shiou; Dahms, Hans-Uwe; Oschlies, Andreas
Issue DateSep-2020
PublisherNational Academy of Sciences (U.S.)
CitationProceedings of the National Academy of Sciences of the USA 117(36): 22281-22292 (2020)
AbstractSeawater Mg:Ca and Sr:Ca ratios are biogeochemical parameters reflecting the Earth–ocean–atmosphere dynamic exchange of elements. The ratios’ dependence on the environment and organisms' biology facilitates their application in marine sciences. Here, we present a measured single-laboratory dataset, combined with previous data, to test the assumption of limited seawater Mg:Ca and Sr:Ca variability across marine environments globally. High variability was found in open-ocean upwelling and polar regions, shelves/neritic and river-influenced areas, where seawater Mg:Ca and Sr:Ca ratios range from ∼4.40 to 6.40 mmol:mol and ∼6.95 to 9.80 mmol:mol, respectively. Open-ocean seawater Mg:Ca is semiconservative (∼4.90 to 5.30 mol:mol), while Sr:Ca is more variable and nonconservative (∼7.70 to 8.80 mmol:mol); both ratios are nonconservative in coastal seas. Further, the Ca, Mg, and Sr elemental fluxes are connected to large total alkalinity deviations from International Association for the Physical Sciences of the Oceans (IAPSO) standard values. Because there is significant modern seawater Mg:Ca and Sr:Ca ratios variability across marine environments we cannot absolutely assume that fossil archives using taxa-specific proxies reflect true global seawater chemistry but rather taxa- and process-specific ecosystem variations, reflecting regional conditions. This variability could reconcile secular seawater Mg:Ca and Sr:Ca ratio reconstructions using different taxa and techniques by assuming an error of 1 to 1.50 mol:mol, and 1 to 1.90 mmol:mol, respectively. The modern ratios’ variability is similar to the reconstructed rise over 20 Ma (Neogene Period), nurturing the question of seminonconservative behavior of Ca, Mg, and Sr over modern Earth geological history with an overlooked environmental effect
Description12 pages, 5 figures, supporting information https://doi.org/10.1073/pnas.1918943117.-- Data Availability. Our published databases are publicly accessible for readers, and they are deposited at the NOAA NCEI at https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.nodc:0171017.-- This is Pacific Marine Environmental Laboratory contribution number 5046
Publisher version (URL)https://doi.org/10.1073/pnas.1918943117
URIhttp://hdl.handle.net/10261/221953
DOI10.1073/pnas.1918943117
ISSN0027-8424
E-ISSN1091-6490
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