OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models
<p>We present the first version of OMEN-SED (Organic Matter ENabled SEDiment model), a new, one-dimensional analytical early diagenetic model resolving organic matter cycling and the associated biogeochemical dynamics in marine sediments designed to be coupled to Earth system models. OMEN-...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-07-01
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| Series: | Geoscientific Model Development |
| Online Access: | https://www.geosci-model-dev.net/11/2649/2018/gmd-11-2649-2018.pdf |
| _version_ | 1818586526755323904 |
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| author | D. Hülse D. Hülse S. Arndt S. Arndt S. Daines P. Regnier A. Ridgwell A. Ridgwell |
| author_facet | D. Hülse D. Hülse S. Arndt S. Arndt S. Daines P. Regnier A. Ridgwell A. Ridgwell |
| author_sort | D. Hülse |
| collection | DOAJ |
| description | <p>We present the first version of
OMEN-SED (Organic Matter ENabled SEDiment model), a new, one-dimensional
analytical early diagenetic model resolving organic matter cycling and
the associated biogeochemical dynamics in marine sediments designed to be coupled
to Earth system models. OMEN-SED explicitly describes organic matter
(OM) cycling and the associated dynamics of the most important
terminal electron acceptors (i.e. O<sub>2</sub>, NO<sub>3</sub>, SO<sub>4</sub>) and
methane (CH<sub>4</sub>), related reduced substances (NH<sub>4</sub>, H<sub>2</sub>S),
macronutrients (PO<sub>4</sub>) and associated pore water quantities
(ALK, DIC). Its reaction network accounts for the most
important primary and secondary redox reactions, equilibrium reactions,
mineral dissolution and precipitation, as well as adsorption and desorption
processes associated with OM dynamics that affect the dissolved and solid
species explicitly resolved in the model. To represent a redox-dependent
sedimentary P cycle we also include a representation of the formation and
burial of Fe-bound P and authigenic Ca–P minerals. Thus, OMEN-SED is able to
capture the main features of diagenetic dynamics in marine sediments and
therefore offers similar predictive abilities as a complex, numerical
diagenetic model. Yet, its computational efficiency allows for its coupling to
global Earth system models and therefore the investigation of coupled global
biogeochemical dynamics over a wide range of climate-relevant timescales.
This paper provides a detailed description of the new sediment model, an
extensive sensitivity analysis and an evaluation of OMEN-SED's
performance through comprehensive comparisons with observations and results
from a more complex numerical model. We find that solid-phase and dissolved pore
water profiles for different ocean depths are reproduced with good accuracy
and simulated terminal electron acceptor fluxes fall well within the range of
globally observed fluxes. Finally, we illustrate its application in an Earth
system model framework by coupling OMEN-SED to the Earth system model cGENIE
and tune the OM degradation rate constants to optimise the fit of simulated
benthic OM contents to global observations. We find that the simulated sediment
characteristics of the coupled model framework, such as OM degradation rates,
oxygen penetration depths and sediment–water interface fluxes, are generally
in good agreement with observations and in line with what one would expect on
a global scale. Coupled to an Earth system model, OMEN-SED is thus a powerful
tool that will not only help elucidate the role of benthic–pelagic exchange
processes in the evolution and the termination of a wide
range of climate events, but will also allow for a direct comparison of model
output with the sedimentary record – the most important climate archive on
Earth.</p> |
| first_indexed | 2024-12-16T08:54:22Z |
| format | Article |
| id | doaj.art-4a13107530be4db08c41b9dfcb8d8a8c |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-16T08:54:22Z |
| publishDate | 2018-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-4a13107530be4db08c41b9dfcb8d8a8c2022-12-21T22:37:19ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032018-07-01112649268910.5194/gmd-11-2649-2018OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system modelsD. Hülse0D. Hülse1S. Arndt2S. Arndt3S. Daines4P. Regnier5A. Ridgwell6A. Ridgwell7BRIDGE, School of Geographical Sciences, University of Bristol, Clifton, Bristol BS8 1SS, UKDepartment of Earth Sciences, University of California, Riverside, CA 92521, USABRIDGE, School of Geographical Sciences, University of Bristol, Clifton, Bristol BS8 1SS, UKBGeosys, Department Geoscience, Environment & Society (DGES), Université Libre de Bruxelles, Brussels, BelgiumEarth System Science, University of Exeter, North Park Road, Exeter EX4 4QE, UKBGeosys, Department Geoscience, Environment & Society (DGES), Université Libre de Bruxelles, Brussels, BelgiumBRIDGE, School of Geographical Sciences, University of Bristol, Clifton, Bristol BS8 1SS, UKDepartment of Earth Sciences, University of California, Riverside, CA 92521, USA<p>We present the first version of OMEN-SED (Organic Matter ENabled SEDiment model), a new, one-dimensional analytical early diagenetic model resolving organic matter cycling and the associated biogeochemical dynamics in marine sediments designed to be coupled to Earth system models. OMEN-SED explicitly describes organic matter (OM) cycling and the associated dynamics of the most important terminal electron acceptors (i.e. O<sub>2</sub>, NO<sub>3</sub>, SO<sub>4</sub>) and methane (CH<sub>4</sub>), related reduced substances (NH<sub>4</sub>, H<sub>2</sub>S), macronutrients (PO<sub>4</sub>) and associated pore water quantities (ALK, DIC). Its reaction network accounts for the most important primary and secondary redox reactions, equilibrium reactions, mineral dissolution and precipitation, as well as adsorption and desorption processes associated with OM dynamics that affect the dissolved and solid species explicitly resolved in the model. To represent a redox-dependent sedimentary P cycle we also include a representation of the formation and burial of Fe-bound P and authigenic Ca–P minerals. Thus, OMEN-SED is able to capture the main features of diagenetic dynamics in marine sediments and therefore offers similar predictive abilities as a complex, numerical diagenetic model. Yet, its computational efficiency allows for its coupling to global Earth system models and therefore the investigation of coupled global biogeochemical dynamics over a wide range of climate-relevant timescales. This paper provides a detailed description of the new sediment model, an extensive sensitivity analysis and an evaluation of OMEN-SED's performance through comprehensive comparisons with observations and results from a more complex numerical model. We find that solid-phase and dissolved pore water profiles for different ocean depths are reproduced with good accuracy and simulated terminal electron acceptor fluxes fall well within the range of globally observed fluxes. Finally, we illustrate its application in an Earth system model framework by coupling OMEN-SED to the Earth system model cGENIE and tune the OM degradation rate constants to optimise the fit of simulated benthic OM contents to global observations. We find that the simulated sediment characteristics of the coupled model framework, such as OM degradation rates, oxygen penetration depths and sediment–water interface fluxes, are generally in good agreement with observations and in line with what one would expect on a global scale. Coupled to an Earth system model, OMEN-SED is thus a powerful tool that will not only help elucidate the role of benthic–pelagic exchange processes in the evolution and the termination of a wide range of climate events, but will also allow for a direct comparison of model output with the sedimentary record – the most important climate archive on Earth.</p>https://www.geosci-model-dev.net/11/2649/2018/gmd-11-2649-2018.pdf |
| spellingShingle | D. Hülse D. Hülse S. Arndt S. Arndt S. Daines P. Regnier A. Ridgwell A. Ridgwell OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models Geoscientific Model Development |
| title | OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models |
| title_full | OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models |
| title_fullStr | OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models |
| title_full_unstemmed | OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models |
| title_short | OMEN-SED 1.0: a novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models |
| title_sort | omen sed 1 0 a novel numerically efficient organic matter sediment diagenesis module for coupling to earth system models |
| url | https://www.geosci-model-dev.net/11/2649/2018/gmd-11-2649-2018.pdf |
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