Tréguer, Paul and Sutton, Jill N. and Brzezinski, Mark and Charette, Matthew A. and Devries, Timothy and Dutkiewicz, Stephanie and Ehlert, Claudia and Hawkings, Jon and Leynaert, Aude and Liu, Su Mei and Llopis Monferrer, Natalia and López-Acosta, María and Maldonado, Manuel and Rahman, Shaily and Ran, Lihua and Rouxel, Olivier (2021) Reviews and syntheses: the biogeochemical cycle of silicon in the modern ocean. Biogeosciences, 18 (4). pp. 1269-1289. ISSN 1726-4189

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The element silicon (Si) is required for the growth of silicified organisms in marine environments, such as di- atoms. These organisms consume vast amounts of Si to- gether with N, P, and C, connecting the biogeochemical cy- cles of these elements. Thus, understanding the Si cycle in the ocean is critical for understanding wider issues such as carbon sequestration by the ocean’s biological pump. In this review, we show that recent advances in process studies indicate that total Si inputs and outputs, to and from the world ocean, are 57% and 37% higher, respectively, than previ- ous estimates. We also update the total ocean silicic acid in- ventory value, which is about 24% higher than previously estimated. These changes are significant, modifying factors such as the geochemical residence time of Si, which is now about 8000 years, 2 times faster than previously assumed. In addition, we present an updated value of the global annual pelagic biogenic silica production (255 Tmol Siyr−1) based on new data from 49 field studies and 18 model outputs, and we provide a first estimate of the global an- nual benthic biogenic silica production due to sponges (6 Tmol Siyr−1). Given these important modifications, we hypothesize that the modern ocean Si cycle is at approxi- mately steady state with inputs = 14.8(±2.6) Tmol Siyr−1 and outputs = 15.6(±2.4) Tmol Siyr−1. Potential impacts of global change on the marine Si cycle are discussed.

Item Type: Article
Subjects: Science and mathematics > Chemistry
Science and mathematics > Earth sciences and geology
Science and mathematics > Life sciences, biology
Divisions: Faculty of Mathematics and Science > Institute for Chemistry and Biology of the Marine Environment (ICBM)
Date Deposited: 24 Feb 2022 09:20
Last Modified: 24 Feb 2022 09:20
URN: urn:nbn:de:gbv:715-oops-53606
DOI: 10.5194/bg-18-1269-2021

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