Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour
Uncertainties in projections of marine biogeochemistry from Earth system models (ESMs) are associated to a large degree with the imperfect representation of the marine plankton ecosystem, in particular the physiology of primary and secondary producers. Here, we describe the implementation of an opti...
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Copernicus Publications
2020
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Online Access: | https://doi.org/10.5194/gmd-13-4663-2020 https://noa.gwlb.de/receive/cop_mods_00054178 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053829/gmd-13-4663-2020.pdf https://gmd.copernicus.org/articles/13/4663/2020/gmd-13-4663-2020.pdf |
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article Verlagsveröffentlichung Pahlow, Markus Chien, Chia-Te Arteaga, Lionel A. Oschlies, Andreas Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour |
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article Verlagsveröffentlichung |
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Uncertainties in projections of marine biogeochemistry from Earth system models (ESMs) are associated to a large degree with the imperfect representation of the marine plankton ecosystem, in particular the physiology of primary and secondary producers. Here, we describe the implementation of an optimality-based plankton–ecosystem model (OPEM) version 1.1 with variable carbon : nitrogen : phosphorus ( C:N:P) stoichiometry in the University of Victoria ESM (UVic; Eby et al., 2009; Weaver et al., 2001) and the behaviour of two calibrated reference configurations, which differ in the assumed temperature dependence of diazotrophs. Predicted tracer distributions of oxygen and dissolved inorganic nutrients are similar to those of an earlier fixed-stoichiometry formulation in UVic (Nickelsen et al., 2015). Compared to the classic fixed-stoichiometry UVic model, OPEM is closer to recent satellite-based estimates of net community production (NCP), despite overestimating net primary production (NPP), can better reproduce deep-ocean gradients in the NO3-:PO43- ratio and partially explains observed patterns of particulate C:N:P in the surface ocean. Allowing diazotrophs to grow (but not necessarily fix N2) at similar temperatures as other phytoplankton results in a better representation of surface Chl and NPP in the Arctic and Antarctic oceans. Deficiencies of our calibrated OPEM configurations may serve as a magnifying glass for shortcomings in global biogeochemical models and hence guide future model development. The overestimation of NPP at low latitudes indicates the need for improved representations of temperature effects on biotic processes, as well as phytoplankton community composition, which may be represented by locally varying parameters based on suitable trade-offs. The similarity in the overestimation of NPP and surface autotrophic particulate organic carbon (POC) could indicate deficiencies in the representation of top-down control or nutrient supply to the surface ocean. Discrepancies between observed and predicted vertical gradients in particulate C:N:P ratios suggest the need to include preferential P remineralisation, which could also benefit the representation of N2 fixation. While OPEM yields a much improved distribution of surface N* ( NO3--16⋅PO43-+2.9 mmol m−3), it still fails to reproduce observed N* in the Arctic, possibly related to a misrepresentation of the phytoplankton community there and the lack of benthic denitrification in the model. Coexisting ordinary and diazotrophic phytoplankton can exert strong control on N* in our simulations, which questions the interpretation of N* as reflecting the balance of N2 fixation and denitrification. |
format |
Article in Journal/Newspaper |
author |
Pahlow, Markus Chien, Chia-Te Arteaga, Lionel A. Oschlies, Andreas |
author_facet |
Pahlow, Markus Chien, Chia-Te Arteaga, Lionel A. Oschlies, Andreas |
author_sort |
Pahlow, Markus |
title |
Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour |
title_short |
Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour |
title_full |
Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour |
title_fullStr |
Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour |
title_full_unstemmed |
Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour |
title_sort |
optimality-based non-redfield plankton–ecosystem model (opem v1.1) in uvic-escm 2.9 – part 1: implementation and model behaviour |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/gmd-13-4663-2020 https://noa.gwlb.de/receive/cop_mods_00054178 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053829/gmd-13-4663-2020.pdf https://gmd.copernicus.org/articles/13/4663/2020/gmd-13-4663-2020.pdf |
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Antarc* Antarctic Arctic Phytoplankton |
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Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-13-4663-2020 https://noa.gwlb.de/receive/cop_mods_00054178 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053829/gmd-13-4663-2020.pdf https://gmd.copernicus.org/articles/13/4663/2020/gmd-13-4663-2020.pdf |
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CC-BY |
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https://doi.org/10.5194/gmd-13-4663-2020 |
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Geoscientific Model Development |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00054178 2023-05-15T13:37:34+02:00 Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 1: Implementation and model behaviour Pahlow, Markus Chien, Chia-Te Arteaga, Lionel A. Oschlies, Andreas 2020-10 electronic https://doi.org/10.5194/gmd-13-4663-2020 https://noa.gwlb.de/receive/cop_mods_00054178 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053829/gmd-13-4663-2020.pdf https://gmd.copernicus.org/articles/13/4663/2020/gmd-13-4663-2020.pdf eng eng Copernicus Publications Geoscientific Model Development -- http://www.bibliothek.uni-regensburg.de/ezeit/?2456725 -- http://www.geosci-model-dev.net/ -- 1991-9603 https://doi.org/10.5194/gmd-13-4663-2020 https://noa.gwlb.de/receive/cop_mods_00054178 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00053829/gmd-13-4663-2020.pdf https://gmd.copernicus.org/articles/13/4663/2020/gmd-13-4663-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/gmd-13-4663-2020 2022-02-08T22:35:08Z Uncertainties in projections of marine biogeochemistry from Earth system models (ESMs) are associated to a large degree with the imperfect representation of the marine plankton ecosystem, in particular the physiology of primary and secondary producers. Here, we describe the implementation of an optimality-based plankton–ecosystem model (OPEM) version 1.1 with variable carbon : nitrogen : phosphorus ( C:N:P) stoichiometry in the University of Victoria ESM (UVic; Eby et al., 2009; Weaver et al., 2001) and the behaviour of two calibrated reference configurations, which differ in the assumed temperature dependence of diazotrophs. Predicted tracer distributions of oxygen and dissolved inorganic nutrients are similar to those of an earlier fixed-stoichiometry formulation in UVic (Nickelsen et al., 2015). Compared to the classic fixed-stoichiometry UVic model, OPEM is closer to recent satellite-based estimates of net community production (NCP), despite overestimating net primary production (NPP), can better reproduce deep-ocean gradients in the NO3-:PO43- ratio and partially explains observed patterns of particulate C:N:P in the surface ocean. Allowing diazotrophs to grow (but not necessarily fix N2) at similar temperatures as other phytoplankton results in a better representation of surface Chl and NPP in the Arctic and Antarctic oceans. Deficiencies of our calibrated OPEM configurations may serve as a magnifying glass for shortcomings in global biogeochemical models and hence guide future model development. The overestimation of NPP at low latitudes indicates the need for improved representations of temperature effects on biotic processes, as well as phytoplankton community composition, which may be represented by locally varying parameters based on suitable trade-offs. The similarity in the overestimation of NPP and surface autotrophic particulate organic carbon (POC) could indicate deficiencies in the representation of top-down control or nutrient supply to the surface ocean. Discrepancies between observed and predicted vertical gradients in particulate C:N:P ratios suggest the need to include preferential P remineralisation, which could also benefit the representation of N2 fixation. While OPEM yields a much improved distribution of surface N* ( NO3--16⋅PO43-+2.9 mmol m−3), it still fails to reproduce observed N* in the Arctic, possibly related to a misrepresentation of the phytoplankton community there and the lack of benthic denitrification in the model. Coexisting ordinary and diazotrophic phytoplankton can exert strong control on N* in our simulations, which questions the interpretation of N* as reflecting the balance of N2 fixation and denitrification. Article in Journal/Newspaper Antarc* Antarctic Arctic Phytoplankton Niedersächsisches Online-Archiv NOA Antarctic Arctic Weaver ENVELOPE(-153.833,-153.833,-86.967,-86.967) Geoscientific Model Development 13 10 4663 4690 |