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| Titel |
Sensitivity of a one-dimensional, multi-layer, sea ice-microalgae model |
| VerfasserIn |
Martin Vancoppenolle, Cecilia Bitz, Thierry Fichefet, Hugues Goosse, Christiane Lancelot, Jean-louis Tison |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055810
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| Zusammenfassung |
| Microalgae grow in brine inclusions in sea ice. Previous sea ice micro-algal models
neglect brine-microalgae interactions, prescribing the location of the microbial
communities.
In this study, a 1D sea ice model with explicit brine dynamics coupled to a simple
nutrient-phytoplankton (N-P) module (diatoms and dissolved silicates) is introduced. The
model naturally predicts bottom and surface micro-algal populations. In fall, brine convection
in cooling ice supplies nutrients, which favors microalgal growth. In early summer, the
vertical brine density profile in warmer ice stabilizes, nutrient supply shuts off, which
prevents further biomass building.
Simulated micro-algal growth episodes are strongly sensitive to parameters. Hence,
sensitivity of maximum summer biomass to standardized parameter changes are
conducted in order to find the main parameters of the model. It is shown that the main
parameters involve microalgal growth and decay rates, light adaptation of micro-algae
and nutrient quota in micro-algal cells. Physical parameters involving radiative
transfer, particularly under snow, are also important. Other parameters are of smaller
importance, in particular those involving the absorption of radiation by micro-algae. |
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