The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum
The sea-surface microlayer (SML) is the oceanic boundary to the atmosphere that mediates climate relevant processes like gas exchange and primary organic aerosols (POA) emission. In highly productive periods, POA can include marine gels that originate from phytoplankton exudates, and accumulate in t...
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ftoceanrep:oai:oceanrep.geomar.de:23737 2023-05-15T14:24:01+02:00 The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum Galgani, Luisa Piontek, Judith Engel, Anja 2014 https://oceanrep.geomar.de/id/eprint/23737/ unknown Galgani, L., Piontek, J. and Engel, A. (2014) The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum. [Talk] In: Ocean Sciences Meeting 2014. , 23.-28.02.2014, Honululu, Hawaii, USA . Conference or Workshop Item NonPeerReviewed 2014 ftoceanrep 2023-04-07T15:12:36Z The sea-surface microlayer (SML) is the oceanic boundary to the atmosphere that mediates climate relevant processes like gas exchange and primary organic aerosols (POA) emission. In highly productive periods, POA can include marine gels that originate from phytoplankton exudates, and accumulate in the SML. During the 2012 sea ice minimum, total and dissolved organic carbon and amino acids, polysaccharidic and proteinaceous gels and their SML-enrichment were investigated in pack-ice melt ponds, at the ice edge and in open water north of 80°N. Based on carbon-normalized amino acids yields, more labile organic matter coincided with low-salinity ponds, where ice melting promoted a freshening of seawater. Higher salinities favored the abundance of bacteria and gels in the SML. Small particles (0.4–1.25 µm), largely proteinaceous and potentially relevant as POA precursors, dominated up to 85% of total gels abundance. We suggest that the organic composition of arctic microlayers, reflect the microbial turnover of organic matter and is likely to be affected by sea ice retreat. We discuss potential consequences on air-sea gas exchange and POA dynamics in the future Arctic Ocean. Conference Object Arctic Arctic Arctic Ocean Phytoplankton Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
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description |
The sea-surface microlayer (SML) is the oceanic boundary to the atmosphere that mediates climate relevant processes like gas exchange and primary organic aerosols (POA) emission. In highly productive periods, POA can include marine gels that originate from phytoplankton exudates, and accumulate in the SML. During the 2012 sea ice minimum, total and dissolved organic carbon and amino acids, polysaccharidic and proteinaceous gels and their SML-enrichment were investigated in pack-ice melt ponds, at the ice edge and in open water north of 80°N. Based on carbon-normalized amino acids yields, more labile organic matter coincided with low-salinity ponds, where ice melting promoted a freshening of seawater. Higher salinities favored the abundance of bacteria and gels in the SML. Small particles (0.4–1.25 µm), largely proteinaceous and potentially relevant as POA precursors, dominated up to 85% of total gels abundance. We suggest that the organic composition of arctic microlayers, reflect the microbial turnover of organic matter and is likely to be affected by sea ice retreat. We discuss potential consequences on air-sea gas exchange and POA dynamics in the future Arctic Ocean. |
format |
Conference Object |
author |
Galgani, Luisa Piontek, Judith Engel, Anja |
spellingShingle |
Galgani, Luisa Piontek, Judith Engel, Anja The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
author_facet |
Galgani, Luisa Piontek, Judith Engel, Anja |
author_sort |
Galgani, Luisa |
title |
The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
title_short |
The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
title_full |
The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
title_fullStr |
The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
title_full_unstemmed |
The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
title_sort |
gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum |
publishDate |
2014 |
url |
https://oceanrep.geomar.de/id/eprint/23737/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Phytoplankton Sea ice |
op_relation |
Galgani, L., Piontek, J. and Engel, A. (2014) The Gel-like nature of the sea-surface microlayer during the 2012 arctic sea-ice minimum. [Talk] In: Ocean Sciences Meeting 2014. , 23.-28.02.2014, Honululu, Hawaii, USA . |
_version_ |
1766296477702815744 |