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| Titel |
Damping effect of flexible phytoplanktonic C:N ratio on primary production at basin-scale |
| VerfasserIn |
Sakina-Dorothée Ayata, Marina Lévy, Olivier Aumont, Laure Resplandy, Alessandro Tagliabue, Antoine Sciandra, Olivier Bernard |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080155
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| Zusammenfassung |
| The spatial and temporal variations of the phytoplanktonic C:N ratio in an oceanic basin
and its impact on primary production are described from 3D bio-physical modelling. A simple marine
ecosystem model with variable phytoplanktonic C:N ratio (cell-quota model) is coupled to a 3D
eddy-resolving model representing a double gyre circulation at basin-scale. The results are compared
with those obtained with constant C:N ratio (Redfield model) in the same configuration. Realistic
values of C:N ratios for phytoplankton and production are simulated, with mesoscale, seasonal, and
zonal variations, and are in agreement with previous in situ measurements. Various metrics are used
to describe the spatial and temporal scales of variability if the phytoplanktonic C:N ratio. Our main
result is that taking into account phytoplanktonic plasticity through a variable C:N ratio (flexibility)
smoothes the spatial and temporal variability of both phytoplankton concentration and primary
production compared to Redfield model (damping effect). Especially, production is increased in the
southern low-productive oligotrophic gyre and decreased in the northern high-productive gyre (of
+39% and -34%, respectively, for the production in carbon). |
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