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Complexity in biogeochemical models: consequences for the biological carbon pump.

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Title: Complexity in biogeochemical models: consequences for the biological carbon pump.
Authors: Rogerson, Jonathan1 (AUTHOR) jonathan.rogerson@lsce.ipsl.fr, Tagliabue, Alessandro2 (AUTHOR), Nguyen, Agathe1 (AUTHOR), Vichi, Marcello3,4 (AUTHOR), Wrightson, Lewis2 (AUTHOR), Anugerahanti, Prima2,5 (AUTHOR), Aumont, Olivier6 (AUTHOR), Gehlen, Marion1 (AUTHOR)
Source: Biogeosciences. 2026, Vol. 23 Issue 9, p3179-3194. 16p.
Subject Terms: *Phytoplankton, *Parameterization, *Carbon fixation, *Carbon sequestration, *Carbon cycle, *Marine ecology, *Statistical models
Abstract: Ocean biogeochemical models underpin projections of future marine ecosystem change, including anticipated shifts in the biological carbon pump (BCP) and broader biogeochemical cycles. However, their outputs remain highly sensitive to model complexity and parameterisation choices. Here, we evaluate five configurations of the Pelagic Interaction Scheme for Carbon and Ecosystem Studies (PISCES) to quantify intramodel variability in net primary productivity (NPP), carbon export (Cexp), and export efficiency (e-ratio) over the 21st century under the high emissions RCP8.5 scenario. The tested PISCES configurations differed from the standard model through distinct modifications to phytoplankton growth processes, but are forced by identical physical variables, representing an ensemble opportunity. All configurations resolve NPP and Cexp within the range of remote-sensing variability. The more complex Quota-based configurations produce 15–21 (10–18) PgCyr-1 more NPP than the simpler Monod-quota models in the reference (future) period, but this increase, driven by elevated small phytoplankton biomass, does not enhance Cexp , yielding lower e-ratios (0.14–0.17) than in the Monod-quota configurations (∼0.25). The introduction of a picophytoplankton functional type (PFT) emerges as one of the most influential parameterisation choices. It drives opposing future NPP responses between 30–60° N/S, an increase in the Monod-quota configurations versus a decline in the Quota-based ones, as well as contrasting latitudinal trends in Cexp within the same region. Other parameterisations, such as a low-iron scheme, an added diazotroph PFT, and explicit manganese cycling, exert more modest, regionally confined effects under high emissions scenarios, influencing NPP and Cexp primarily at biome scales rather than driving large-scale divergence in model behaviour. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Data: Complexity in biogeochemical models: consequences for the biological carbon pump.
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  Data: <searchLink fieldCode="AR" term="%22Rogerson%2C+Jonathan%22">Rogerson, Jonathan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jonathan.rogerson@lsce.ipsl.fr</i><br /><searchLink fieldCode="AR" term="%22Tagliabue%2C+Alessandro%22">Tagliabue, Alessandro</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nguyen%2C+Agathe%22">Nguyen, Agathe</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vichi%2C+Marcello%22">Vichi, Marcello</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wrightson%2C+Lewis%22">Wrightson, Lewis</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Anugerahanti%2C+Prima%22">Anugerahanti, Prima</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aumont%2C+Olivier%22">Aumont, Olivier</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gehlen%2C+Marion%22">Gehlen, Marion</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Biogeosciences%22">Biogeosciences</searchLink>. 2026, Vol. 23 Issue 9, p3179-3194. 16p.
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  Data: *<searchLink fieldCode="DE" term="%22Phytoplankton%22">Phytoplankton</searchLink><br />*<searchLink fieldCode="DE" term="%22Parameterization%22">Parameterization</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon+fixation%22">Carbon fixation</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon+sequestration%22">Carbon sequestration</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon+cycle%22">Carbon cycle</searchLink><br />*<searchLink fieldCode="DE" term="%22Marine+ecology%22">Marine ecology</searchLink><br />*<searchLink fieldCode="DE" term="%22Statistical+models%22">Statistical models</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Ocean biogeochemical models underpin projections of future marine ecosystem change, including anticipated shifts in the biological carbon pump (BCP) and broader biogeochemical cycles. However, their outputs remain highly sensitive to model complexity and parameterisation choices. Here, we evaluate five configurations of the Pelagic Interaction Scheme for Carbon and Ecosystem Studies (PISCES) to quantify intramodel variability in net primary productivity (NPP), carbon export (Cexp), and export efficiency (e-ratio) over the 21st century under the high emissions RCP8.5 scenario. The tested PISCES configurations differed from the standard model through distinct modifications to phytoplankton growth processes, but are forced by identical physical variables, representing an ensemble opportunity. All configurations resolve NPP and Cexp within the range of remote-sensing variability. The more complex Quota-based configurations produce 15–21 (10–18) PgCyr-1 more NPP than the simpler Monod-quota models in the reference (future) period, but this increase, driven by elevated small phytoplankton biomass, does not enhance Cexp , yielding lower e-ratios (0.14–0.17) than in the Monod-quota configurations (∼0.25). The introduction of a picophytoplankton functional type (PFT) emerges as one of the most influential parameterisation choices. It drives opposing future NPP responses between 30–60° N/S, an increase in the Monod-quota configurations versus a decline in the Quota-based ones, as well as contrasting latitudinal trends in Cexp within the same region. Other parameterisations, such as a low-iron scheme, an added diazotroph PFT, and explicit manganese cycling, exert more modest, regionally confined effects under high emissions scenarios, influencing NPP and Cexp primarily at biome scales rather than driving large-scale divergence in model behaviour. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.5194/bg-23-3179-2026
    Languages:
      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 3179
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      – SubjectFull: Phytoplankton
        Type: general
      – SubjectFull: Parameterization
        Type: general
      – SubjectFull: Carbon fixation
        Type: general
      – SubjectFull: Carbon sequestration
        Type: general
      – SubjectFull: Carbon cycle
        Type: general
      – SubjectFull: Marine ecology
        Type: general
      – SubjectFull: Statistical models
        Type: general
    Titles:
      – TitleFull: Complexity in biogeochemical models: consequences for the biological carbon pump.
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            – D: 01
              M: 05
              Text: 2026
              Type: published
              Y: 2026
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