Phytoplankton plasticity drives large variability in carbon fixation efficiency

Sakina Dorothée Ayata, Marina Lévy, Olivier Aumont, Laure Resplandy, Alessandro Tagliabue, Antoine Sciandra, Olivier Bernard

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Phytoplankton C:N stoichiometry is highly flexible due to physiological plasticity, which could lead to high variations in carbon fixation efficiency (carbon consumption relative to nitrogen). However, the magnitude, as well as the spatial and temporal scales of variability, remains poorly constrained. We used a high-resolution biogeochemical model resolving various scales from small to high, spatially and temporally, in order to quantify and better understand this variability. We find that phytoplankton C:N ratio is highly variable at all spatial and temporal scales (5-12 molC/molN), from mesoscale to regional scale, and is mainly driven by nitrogen supply. Carbon fixation efficiency varies accordingly at all scales (±30%), with higher values under oligotrophic conditions and lower values under eutrophic conditions. Hence, phytoplankton plasticity may act as a buffer by attenuating carbon sequestration variability. Our results have implications for in situ estimations of C:N ratios and for future predictions under high CO2 world. Key PointsBasin-scale high-resolution simulation of flexible phytoplankton C:N ratiosLarge C:N variability revealed at mesoscale, between trophic regimes and seasonsThis damps carbon sequestration variability at all scales

Original languageEnglish (US)
Pages (from-to)8994-9000
Number of pages7
JournalGeophysical Research Letters
Volume41
Issue number24
DOIs
StatePublished - Dec 28 2014

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • model
  • phytoplankton
  • production
  • stoichiometry

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