Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica
Sea ice ecosystems are characterized by microalgae living in brine inclusions. The growth rate of ice algae depends on light and nutrient supply. Here, the interactions between nutrients and brine dynamics under the influence of algae are investigated using a one-dimensional model. The model include...
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:71048 2024-05-12T07:53:18+00:00 Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica Vancoppenolle, Martin Goosse, Hugues Fichefet, Thierry UCL - SST/ELI - Earth and Life Institute UCL - SC/SC - Faculté des sciences UCL - SC/RSC - Rattachement SC 2010 http://hdl.handle.net/2078.1/71048 https://doi.org/10.1029/2009JC005369 eng eng boreal:71048 http://hdl.handle.net/2078.1/71048 doi:10.1029/2009JC005369 urn:ISSN:0094-8276 urn:EISSN:1944-8007 info:eu-repo/semantics/restrictedAccess Journal of Geophysical Research , Vol. 115, no. 1, p. 1-18 (2010) 1443 info:eu-repo/semantics/article 2010 ftunistlouisbrus https://doi.org/10.1029/2009JC005369 2024-04-18T18:11:07Z Sea ice ecosystems are characterized by microalgae living in brine inclusions. The growth rate of ice algae depends on light and nutrient supply. Here, the interactions between nutrients and brine dynamics under the influence of algae are investigated using a one-dimensional model. The model includes snow and ice thermodynamics with brine physics and an idealized sea ice biological component, characterized by one nutrient, namely, dissolved silica (DSi). In the model, DSi follows brine motion and is consumed by ice algae. Depending on physical ice characteristics, the brine flow is either advective, diffusive, or turbulent. The vertical profiles of ice salinity and DSi concentration are solutions of advection-diffusion equations. The model is configured to simulate the typical thermodynamic regimes of first-year Antarctic pack ice. The simulated vertical profiles of salinity and DSi qualitatively reproduce observations. Analysis of results highlights the role of convection in the lowermost 5–10 cm of ice. Convection mixes saline, nutrient-poor brine with comparatively fresh, nutrient-rich seawater. This implies a rejection of salt to the ocean and a flux of DSi to the ice. In the presence of growing algae, the simulated ocean-to-ice DSi flux increases by 0–115% compared to an abiotic situation. In turn, primary production and brine convection act in synergy to form a nutrient pump. The other important processes are the flooding of the surface by seawater and the percolation of meltwater. The former refills nutrients near the ice surface in spring. The latter, if present, tends to expell nutrients from the ice in summer Article in Journal/Newspaper Antarc* Antarctic ice algae Sea ice DIAL@USL-B (Université Saint-Louis, Bruxelles) Antarctic Journal of Geophysical Research 115 C2 |
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Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
topic |
1443 |
spellingShingle |
1443 Vancoppenolle, Martin Goosse, Hugues Fichefet, Thierry Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica |
topic_facet |
1443 |
description |
Sea ice ecosystems are characterized by microalgae living in brine inclusions. The growth rate of ice algae depends on light and nutrient supply. Here, the interactions between nutrients and brine dynamics under the influence of algae are investigated using a one-dimensional model. The model includes snow and ice thermodynamics with brine physics and an idealized sea ice biological component, characterized by one nutrient, namely, dissolved silica (DSi). In the model, DSi follows brine motion and is consumed by ice algae. Depending on physical ice characteristics, the brine flow is either advective, diffusive, or turbulent. The vertical profiles of ice salinity and DSi concentration are solutions of advection-diffusion equations. The model is configured to simulate the typical thermodynamic regimes of first-year Antarctic pack ice. The simulated vertical profiles of salinity and DSi qualitatively reproduce observations. Analysis of results highlights the role of convection in the lowermost 5–10 cm of ice. Convection mixes saline, nutrient-poor brine with comparatively fresh, nutrient-rich seawater. This implies a rejection of salt to the ocean and a flux of DSi to the ice. In the presence of growing algae, the simulated ocean-to-ice DSi flux increases by 0–115% compared to an abiotic situation. In turn, primary production and brine convection act in synergy to form a nutrient pump. The other important processes are the flooding of the surface by seawater and the percolation of meltwater. The former refills nutrients near the ice surface in spring. The latter, if present, tends to expell nutrients from the ice in summer |
author2 |
UCL - SST/ELI - Earth and Life Institute UCL - SC/SC - Faculté des sciences UCL - SC/RSC - Rattachement SC |
format |
Article in Journal/Newspaper |
author |
Vancoppenolle, Martin Goosse, Hugues Fichefet, Thierry |
author_facet |
Vancoppenolle, Martin Goosse, Hugues Fichefet, Thierry |
author_sort |
Vancoppenolle, Martin |
title |
Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica |
title_short |
Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica |
title_full |
Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica |
title_fullStr |
Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica |
title_full_unstemmed |
Modeling brine and nutrient dynamics in Antarctic sea ice: The case of dissolved silica |
title_sort |
modeling brine and nutrient dynamics in antarctic sea ice: the case of dissolved silica |
publishDate |
2010 |
url |
http://hdl.handle.net/2078.1/71048 https://doi.org/10.1029/2009JC005369 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic ice algae Sea ice |
genre_facet |
Antarc* Antarctic ice algae Sea ice |
op_source |
Journal of Geophysical Research , Vol. 115, no. 1, p. 1-18 (2010) |
op_relation |
boreal:71048 http://hdl.handle.net/2078.1/71048 doi:10.1029/2009JC005369 urn:ISSN:0094-8276 urn:EISSN:1944-8007 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1029/2009JC005369 |
container_title |
Journal of Geophysical Research |
container_volume |
115 |
container_issue |
C2 |
_version_ |
1798842039515742208 |