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Le système des carbonates influencé par la diagenèse précoce dans les sédiments côtiers méditerranéens en lien avec l’acidification des océans

Abstract : Continental shelves are key regions for theglobal carbon cycle and particularly exposed to oceanacidification. A large part of organic matter (OM) ofcontinental and marine origin is mineralized in estuarinesediments following oxic and anoxic pathways.This mineralization produces dissolved inorganic carbon(DIC) leading to acidification of the bottom waters.Anoxic mineralization can produce total alkalinity(TA) that can contribute to buffer bottom water pHand increase the CO2 storage capacity of seawater. Measurementsin the sediments of the Rhˆone River prodeltashowed that anoxic mineralization, especially sulfate reduction,are the major pathways of OM mineralizationand create high DIC and TA fluxes. Land derived OMis mineralized close to the river mouth and marine OMtakes over on the shelf. An acidification experiment withsediment cores from the bay of Villefranche evidencedthat acidification causes carbonate dissolution at thesediment surface that buffers porewater pH.
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Jens Rassmann. Le système des carbonates influencé par la diagenèse précoce dans les sédiments côtiers méditerranéens en lien avec l’acidification des océans. Sciences de la Terre. Université Paris Saclay (COmUE), 2016. Français. ⟨NNT : 2016SACLV110⟩. ⟨tel-01523567⟩

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