http://scholars.ntou.edu.tw/handle/123456789/4295
標題: | Global variability in seawater Mg:Ca and Sr:Ca ratios in the modern ocean | 作者: | Lebrato, Mario Garbe-Schoenberg, Dieter Mueller, 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 E. Hartman, Susan E. Westernstroeer, Ulrike Kueter, 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 Li-Chun Tseng Hwang, Jiang-Shiou Dahms, Hans-Uwe Oschlies, Andreas |
關鍵字: | SR/CA RATIOS;SECULAR VARIATION;MG/CA;STRONTIUM;CALCITE;WATER;TEMPERATURE;ARAGONITE;SALINITY;DISSOLUTION | 公開日期: | 8-九月-2020 | 出版社: | NATL ACAD SCIENCES | 卷: | 117 | 期: | 36 | 起(迄)頁: | 22281-22292 | 來源出版物: | P NATL ACAD SCI USA | 摘要: | 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 similar to 4.40 to 6.40 mmol:mol and similar to 6.95 to 9.80 mmol:mol, respectively. Open-ocean seawater Mg:Ca is semi-conservative (similar to 4.90 to 5.30 mol:mol), while Sr:Ca is more variable and nonconservative (similar to 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. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/4295 | ISSN: | 0027-8424 | DOI: | 10.1073/pnas.1918943117 |
顯示於: | 海洋生物研究所 14 LIFE BELOW WATER 15 LIFE ON LAND |
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