High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry
While representing less than 5% of the total ice cover around Antarctica, landfast sea ice is nevertheless an important habitat known to exhibit high biomass levels at the ocean/ice interface, with particulate organic carbon (POC) concentrations easily reaching 2000 μmol C L–1 during spring bloom. S...
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ftorbi:oai:orbi.ulg.ac.be:2268/244518 2024-04-21T07:49:48+00:00 High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry Deman, Florian Roukaerts, A. Tison, J.L. Delille, Bruno Dehairs, F. FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2019-08 https://orbi.uliege.be/handle/2268/244518 en eng https://orbi.uliege.be/handle/2268/244518 info:hdl:2268/244518 International Symposium on Sea ice at the Interface, Winnipeg, Canada [CA], 18-23 August 2019 Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique conference poster not in proceedings http://purl.org/coar/resource_type/c_18co info:eu-repo/semantics/conferencePoster 2019 ftorbi 2024-03-27T14:50:20Z While representing less than 5% of the total ice cover around Antarctica, landfast sea ice is nevertheless an important habitat known to exhibit high biomass levels at the ocean/ice interface, with particulate organic carbon (POC) concentrations easily reaching 2000 μmol C L–1 during spring bloom. Surprisingly, together with the POC increase in bottom ice, fieldwork measurements performed in East Antarctica (Adélie Land 2011, McMurdo Sound 2012, Prydz Bay 2015) of nitrate and phosphate concentrations report a simultaneous increase with concentrations exceeding those of underlying seawater, suggesting an intense remineralization and nitrification processes within the ice. This goes against the classic view of nutrients being consumed during the growth season and regenerated after the height of the bloom. Regardless of the high nitrate levels available in the ice, increasing total nitrogen concentrations also suggest still more nitrogen from the underlying seawater was brought into the ice. Results of a NPZD-model indicates that a second nutrient pool, in addition to the brine pool, is essential to successfully model and reproduce field observations. The presence of a biofilm attached to the ice walls could act as a water-retaining substrate forming microenvironments with chemical gradients within the brine channels. The effect of biofilm on nitrogen dynamics (concentration and isotopic composition) in sea ice will be discussed as well as potential implications for other parameters (phosphate, carbon, oxygen). This calls for the integration of the biofilm concept into the current view of sea-ice biogeochemistry. Conference Object Antarc* Antarctica East Antarctica McMurdo Sound Prydz Bay Sea ice University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Deman, Florian Roukaerts, A. Tison, J.L. Delille, Bruno Dehairs, F. High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
While representing less than 5% of the total ice cover around Antarctica, landfast sea ice is nevertheless an important habitat known to exhibit high biomass levels at the ocean/ice interface, with particulate organic carbon (POC) concentrations easily reaching 2000 μmol C L–1 during spring bloom. Surprisingly, together with the POC increase in bottom ice, fieldwork measurements performed in East Antarctica (Adélie Land 2011, McMurdo Sound 2012, Prydz Bay 2015) of nitrate and phosphate concentrations report a simultaneous increase with concentrations exceeding those of underlying seawater, suggesting an intense remineralization and nitrification processes within the ice. This goes against the classic view of nutrients being consumed during the growth season and regenerated after the height of the bloom. Regardless of the high nitrate levels available in the ice, increasing total nitrogen concentrations also suggest still more nitrogen from the underlying seawater was brought into the ice. Results of a NPZD-model indicates that a second nutrient pool, in addition to the brine pool, is essential to successfully model and reproduce field observations. The presence of a biofilm attached to the ice walls could act as a water-retaining substrate forming microenvironments with chemical gradients within the brine channels. The effect of biofilm on nitrogen dynamics (concentration and isotopic composition) in sea ice will be discussed as well as potential implications for other parameters (phosphate, carbon, oxygen). This calls for the integration of the biofilm concept into the current view of sea-ice biogeochemistry. |
author2 |
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Conference Object |
author |
Deman, Florian Roukaerts, A. Tison, J.L. Delille, Bruno Dehairs, F. |
author_facet |
Deman, Florian Roukaerts, A. Tison, J.L. Delille, Bruno Dehairs, F. |
author_sort |
Deman, Florian |
title |
High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
title_short |
High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
title_full |
High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
title_fullStr |
High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
title_full_unstemmed |
High production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
title_sort |
high production going along with high respiration: impact of biofilm formation for sea-ice biogeochemistry |
publishDate |
2019 |
url |
https://orbi.uliege.be/handle/2268/244518 |
genre |
Antarc* Antarctica East Antarctica McMurdo Sound Prydz Bay Sea ice |
genre_facet |
Antarc* Antarctica East Antarctica McMurdo Sound Prydz Bay Sea ice |
op_source |
International Symposium on Sea ice at the Interface, Winnipeg, Canada [CA], 18-23 August 2019 |
op_relation |
https://orbi.uliege.be/handle/2268/244518 info:hdl:2268/244518 |
_version_ |
1796933785251479552 |