globalchange  > 气候减缓与适应
DOI: 10.1002/2014GL062249
Phytoplankton plasticity drives large variability in carbon fixation efficiency
Author: Ayata S.-D.; Lévy M.; Aumont O.; Resplandy L.; Tagliabue A.; Sciandra A.; Bernard O.
Source Publication: Geophysical Research Letters
ISSN: 0094-9475
EISSN: 1944-9206
Publishing Year: 2014
Volume: 41, Issue:24
pages begin: 8994
pages end: 9000
Language: 英语
Keyword: model ; phytoplankton ; production ; stoichiometry
Scopus Keyword: Carbon ; Carbon dioxide ; Efficiency ; Models ; Nitrogen ; Phytoplankton ; Plasticity ; Production ; Stoichiometry ; Biogeochemical modeling ; C:N stoichiometry ; Carbon consumption ; Carbon sequestration ; Future predictions ; High resolution ; Oligotrophic conditions ; Spatial and temporal scale ; Nitrogen fixation ; basin analysis ; biogeochemistry ; carbon fixation ; carbon sequestration ; eutrophic environment ; nitrogen cycle ; oligotrophic environment ; physiological response ; phytoplankton ; primary production ; spatiotemporal analysis
English 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 ©2014. American Geophysical Union. All Rights Reserved.
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Affiliation: Sorbonne Universités, UPMC Université Paris 06, UMR 7093, LOV, Observatoire Océanologique, Villefranche/mer, France

Recommended Citation:
Ayata S.-D.,Lévy M.,Aumont O.,et al. Phytoplankton plasticity drives large variability in carbon fixation efficiency[J]. Geophysical Research Letters,2014-01-01,41(24).
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