Additionally, itĬomprises OM derived from chemoautotrophyĪl., 2019 Vasquez-Cardenas et al., 2020) and ancient PP, the latterĭelivered through rock weathering, soil erosion, and thawing permafrostġ997 Kusch et al., 2021 Grotheer et al., 2020). Or marine environments (global NPP = ∼ 49 Pg C yr −1)ġ997 Hedges and Oades, 1997 Kharbush et al., 2020). (global net primary productivity, NPP = ∼ 59 Pg C yr −1) Originates from contemporary primary productivity (PP) in terrestrial The majority of OM that reaches modern global ocean seafloors Reactive reservoir of reduced carbon on Earth (e.g. Organic matter (OM) buried in marine sediments represents the largest It thus represents an important advance for model Range of RCM parameters a and v and largely alleviates the difficulty ofĭetermining OM reactivity in RCM by constraining it to only one variable, Therefore, it provides important global constraints on the most plausible On how OM reactivity governs benthic biogeochemical cycling and exchange. Reactivity as a dynamic ecosystem property, (ii) consolidates theĭistributions of RCM parameters, and (iii) provides quantitative constraints Large-scale assessment (i) further supports the notion of apparent OM Sediment, and rates of anaerobic oxidation of methane. Relative significance of OM degradation pathways, the redox zonation of the Results show that apparent OM reactivity exerts a key control on the Model results indicate that, while OM fluxes exert a dominant control onĭepth-integrated OM degradation rates across most depositional environments,Īpparent OM reactivity becomes a dominant control in depositionalĮnvironments that receive exceptionally reactive OM. Thus, we caution against the simplifying use of a single environmentalĬontrol for predicting apparent OM reactivity beyond a specific localĮnvironmental context (i.e. water depth, sedimentation rate, OM fluxes). Whole depositional environment, rather than traditionally proposed, singleĮnvironmental controls (e.g. Parameter a and, thus, in apparent OM reactivity is a function of the Results also show that the variability in In contrast, and in broadĪgreement with previous findings, inversely determined v values fall That the large-scale variability in apparent OM reactivity is largely drivenīy differences in parameter a (10 −3–10 7) with a high frequency Parameter set with a compilation of 37 previously published RCM a and vĮstimates to explore large-scale trends in OM reactivity. Profiles, respectively) from observed benthic organic carbon and sulfateĭynamics across 14 contrasting depositional settings distributed over fiveĭistinct benthic provinces. Parameters ( a and v, which define the shape and scale of OM reactivity OM degradation rate constants) by extracting reactive continuum model (RCM) To fill this gap, we quantify apparent OM reactivity (i.e. Understanding of what controls OM reactivity in marine sediments and,Ĭonsequently, a general framework that would allow model parametrization inĭata-poor areas. However, we still lack a detailed quantitative Spatial and temporal scales is key to understanding carbon cycling in the Thus, degradation, preservation, and burial in marine sediments across Freitas Received: – Discussion started: – Revised: – Accepted: – Published: Ĭonstraining the mechanisms controlling organic matter (OM) reactivity and, Freitas Hide author detailsĬorrespondence: Felipe S. c current address: RSR Ltd, Parc Ty Glas, Llanishen, Cardiff, CF14 5DU,Ĭorrespondence: Felipe S.b current address: Department of Earth Sciences, VU University ofĪmsterdam, 1081 HV Amsterdam, the Netherlands.a current address: School of Earth Sciences, University of Bristol,.10 School of Earth and Ocean Sciences, Cardiff University, Cardiff, CF10.9 Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL,ĬEA-CNRS-UVSQ-Université Paris Saclay, 91198 Gif-sur-Yvette, France.8 Section for Microbiology, Department of Biology, Aarhus University,.7 MARUM – Center for Marine Environmental Sciences, University of.6 Faculty of Geosciences, University of Bremen, 28359 Bremen, Germany.5 Alfred Wegener Institute Helmholtz Centre for Polar and Marine.4 Biogeochemistry and Earth System Modeling, Geosciences, EnvironmentĪnd Society Department, Université Libre de Bruxelles, Brussels,. 3 Cabot Institute for the Environment, University of Bristol, Bristol,.2 BRIDGE, School of Geographical Sciences, University of Bristol,.1 Organic Geochemistry Unit, School of Earth Sciences & School ofĬhemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom.
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