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

• Autores: Lebrato, Mario; Garbe-Schönberg, Dieter; Müller, Marius N.; Blanco-Ameijeiras, Sonia; Feely, Richard A.; Lorenzoni, Laura; Molinero, Juan Carlos; Bremer, Karen; Jones, Daniel O.B.; Iglesias-Rodriguez, Debora; Greeley, Dana; Lamare, Miles D.; Paulmier, Aurelien; Graco, Michelle; Cartes, Joan; Barcelos e Ramos, Joana; de Lara, Ana; Sanchez-Leal, Ricardo; Jimenez, Paz; Paparazzo, Flavio Emiliano; Hartman, Susan E.; Westernströer, Ulrike; Küter, Marie; Benavides, Roberto; da Silva, Armindo F.; Bell, Steven; Payne, Chris; Olafsdottir, Solveig; Robinson, Kelly; Jantunen, Liisa M.; Korablev, Alexander; Webster, Richard J.; Jones, Elizabeth M.; Gilg, Olivier; du Bois, Pascal Bailly; Beldowski, Jacek; Ashjian, Carin; Yahia, Nejib D.; Twining, Benjamin; Chen, Xue-Gang; Tseng, Li-Chun; Hwang, Jiang-Shiou; Dahms, Hans-Uwe; Oschlies, Andreas
• Año de publicación: 2020
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: BIOGEOCHEMISTRY; GLOBAL; MG:CA; SEAWATER; SR:CA
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Seawater 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 semi-nonconservative behavior of Ca, Mg, and Sr over modern Earth geological history with an overlooked environmental effect.
Fil: Lebrato, Mario. Kiel University, Geosciences Department; Alemania
Fil: Garbe-Schönberg, Dieter. Kiel University, Geosciences Department; Alemania
Fil: Müller, Marius N.. Federal University of Pernambuco, Oceanography Department; Brasil
Fil: Blanco-Ameijeiras, Sonia. Eth Zürich, Earth Sciences Department; Suiza
Fil: Feely, Richard A.. National Oceanic And Atmospheric Administration; Australia
Fil: Lorenzoni, Laura. University Of South Florida; Estados Unidos
Fil: Molinero, Juan Carlos. Geomar-Helmholtz Centre for Ocean Research Kiel; Alemania
Fil: Bremer, Karen. Kiel University, Geosciences Department; Alemania
Fil: Jones, Daniel O.B.. National Oceanography Centre; Reino Unido
Fil: Iglesias-Rodriguez, Debora. University Of California; Estados Unidos
Fil: Greeley, Dana. National Oceanic And Atmospheric Administration; Australia
Fil: Lamare, Miles D.. University of Otago; Nueva Zelanda
Fil: Paulmier, Aurelien. Université Paul Sabatier, University of Toulouse; Francia
Fil: Graco, Michelle. Université Paul Sabatier, University of Toulouse; Francia
Fil: Cartes, Joan. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; España
Fil: Barcelos e Ramos, Joana. Universidade Dos Açores; Portugal
Fil: de Lara, Ana. Universidad de Oviedo; España
Fil: Sanchez-Leal, Ricardo. Spanish Institute of Oceanography; España
Fil: Jimenez, Paz. Spanish Institute of Oceanography; España
Fil: Paparazzo, Flavio Emiliano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; Argentina
Fil: Hartman, Susan E.. National Oceanography Center; Reino Unido
Fil: Westernströer, Ulrike. Kiel University, Geosciences Department; Alemania
Fil: Küter, Marie. Kiel University, Geosciences Department; Alemania
Fil: Benavides, Roberto. Geomar-Helmholtz Centre for Ocean Research Kiel; Alemania
Fil: da Silva, Armindo F.. Bazaruto Center For Scientific Studies; Mozambique
Fil: Bell, Steven. Bermuda Institute of Ocean Sciences; Bermudas
Fil: Payne, Chris. University of British Columbia; Canadá
Fil: Olafsdottir, Solveig. Marine And Freshwater Research Institute; Islandia
Fil: Robinson, Kelly. University of Louisiana at Lafayette; Estados Unidos
Fil: Jantunen, Liisa M.. Environment and Climate Change Canada; Canadá
Fil: Korablev, Alexander. University of Bergen; Noruega
Fil: Webster, Richard J.. Children's Hospital of Eastern Ontario, Ottawa; Canadá
Fil: Jones, Elizabeth M.. Institute of Marine Research; Noruega
Fil: Gilg, Olivier. Université de Bourgogne Franche-Comté; Francia
Fil: du Bois, Pascal Bailly. Institut de Radioprotection et de Sȗreté Nucléaire; Francia
Fil: Beldowski, Jacek. Polish Academy of Sciences; Polonia
Fil: Ashjian, Carin. Woods Hole Oceanographic Institution; Estados Unidos
Fil: Yahia, Nejib D.. Qatar University; Qatar
Fil: Twining, Benjamin. Bigelow Laboratory For Ocean Sciences; Estados Unidos
Fil: Chen, Xue-Gang. Zhejiang University; China
Fil: Tseng, Li-Chun. National Taiwan Ocean University; República de China
Fil: Hwang, Jiang-Shiou. National Taiwan Ocean University; República de China
Fil: Dahms, Hans-Uwe. Kaohsiung Medical University, Taiwan; República de China
Fil: Oschlies, Andreas. Geomar-Helmholtz Centre for Ocean Research Kiel; Alemania