The Composition and Flux of Seafloor Sediments in the Global Ocean

Autor: Hayes, Christopher T., Costa, Kassandra M., Calvo, Eva María, Chase, Zanna, Demina, Ludmila L., Dutay, Jean-Claude, German, Christopher R., Heimbürger-Boavida, Lars-Eric, Jaccard, Samuel L., Jacobel, Allison, Kohfeld, Karen E., Kravchishina, Marina D., Lippold, Jörg, Mekik, Figen, Missiaen, Lise, Pavia, Frank, Paytan, Adina, Petrova, Mariia V., Pedrosa-Pàmies, Rut, Rahman, Shaily, Robinson, Laura F., Roy-Barman, Matthieu, Sánchez-Vidal, Anna, Shiller, Alan M., Tagliabue, Alessandro, Tessin, Allyson C., Hulten, Marco van, Zhang, Jing
Rok vydání: 2020
Zdroj: Digital.CSIC: Repositorio Institucional del CSIC
Consejo Superior de Investigaciones Científicas (CSIC)
Digital.CSIC. Repositorio Institucional del CSIC
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Popis: American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New Orleans
Quantitative knowledge about the burial of sedimentary components at the seafloor has wide-ranging implications in ocean science, from global climate to continental weathering. The use of 230Th-normalized fluxes reduces uncertainties that many prior studies faced by accounting for the effects of sediment redistribution by bottom currents and minimizing the impact of age model uncertainty. Here we employ a recently compiled global dataset of 230Th-normalized fluxes with an updated database of seafloor surface sediment composition to derive global maps of the burial flux of calcium carbonate, biogenic opal, total organic carbon (TOC), non-biogenic material, iron, mercury, and excess barium (Ba xs). The spatial patterns of burial of the major components are consistent with prior work, but the new quantitative estimates allow evaluations of global elemental budgets including many marginal seas that were previous data gaps. Our globally-integrated marine burial fluxes are 139 Tg C/yr CaCO3, 179 Tg Si/yr opal, 21Tg C/yr TOC, and 220 Mg Hg/yr. Sedimentary Fe fluxes reflect a mixture of sources including lithogenic material, hydrothermal inputs and authigenic phases. The fluxes of some commonly used paleo-productivity proxies (TOC, biogenic opal, and Ba xs) are not well-correlated geographically with satellite-based productivity estimates on the global scale. Our new compilation of sedimentary fluxes provides more detailed information on burial fluxes, which should lead to substantial improvements in the understanding of how preservation affects these paleoproxies
Databáze: OpenAIRE
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