Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines
Sea ice plays a dynamic role in the air‐sea exchange of CO2. In addition to abiotic inorganic carbon fluxes, an active microbial community produces and remineralizes organic carbon, which can accumulate in sea ice brines as dissolved organic matter (DOM). In this study, the characteristics of DOM fl...
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Online Access: | https://epic.awi.de/id/eprint/24551/ https://epic.awi.de/id/eprint/24551/1/Stedmon_et_al_2011JGR-Bio.pdf https://doi.org/10.1029/2011JG001716 https://hdl.handle.net/10013/epic.38281 https://hdl.handle.net/10013/epic.38281.d001 |
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ftawi:oai:epic.awi.de:24551 2024-09-15T17:45:48+00:00 Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines Stedmon, C. Thomas, D. Papadimitríou, S. Granskog, M. Dieckmann, Gerhard 2011 application/pdf https://epic.awi.de/id/eprint/24551/ https://epic.awi.de/id/eprint/24551/1/Stedmon_et_al_2011JGR-Bio.pdf https://doi.org/10.1029/2011JG001716 https://hdl.handle.net/10013/epic.38281 https://hdl.handle.net/10013/epic.38281.d001 unknown AMER GEOPHYSICAL UNION https://epic.awi.de/id/eprint/24551/1/Stedmon_et_al_2011JGR-Bio.pdf https://hdl.handle.net/10013/epic.38281.d001 Stedmon, C. , Thomas, D. , Papadimitríou, S. , Granskog, M. and Dieckmann, G. (2011) Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines , Journal of Geophysical Research-Biogeosciences, 116 (G03027), pp. 1-9 . doi:10.1029/2011JG001716 <https://doi.org/10.1029/2011JG001716> , hdl:10013/epic.38281 EPIC3Journal of Geophysical Research-Biogeosciences, AMER GEOPHYSICAL UNION, 116(G03027), pp. 1-9, ISSN: 0148-0227 Article isiRev 2011 ftawi https://doi.org/10.1029/2011JG001716 2024-06-24T04:02:42Z Sea ice plays a dynamic role in the air‐sea exchange of CO2. In addition to abiotic inorganic carbon fluxes, an active microbial community produces and remineralizes organic carbon, which can accumulate in sea ice brines as dissolved organic matter (DOM). In this study, the characteristics of DOM fluorescence in Antarctic sea ice brines from the western Weddell Sea were investigated. Two humic‐like components were identified, which were identical to those previously found to accumulate in the deep ocean and represent refractory material. Three amino‐acid‐like signals were found, one of which was unique to the brines and another that was spectrally very similar to tryptophan and found both in seawater and in brine samples. The tryptophan‐like fluorescence in the brines exhibited intensities higher than could be explained by conservative behavior during the freezing of seawater. Its fluorescence was correlated with the accumulation of nitrogen‐rich DOM to concentrations up to 900 mmol L−1 as dissolved organic carbon (DOC) and, thus, potentially represented proteins released by ice organisms. A second, nitrogen‐poor DOM fraction also accumulated in the brines to concentrations up to 200 mmol L−1 but was not correlated with any of the fluorescence signals identified. Because of the high C:N ratio and lack of fluorescence, this material is thought to represent extracellular polymeric substances, which consist primarily of polysaccharides. The clear grouping of the DOM pool into either proteinaceous or carbohydrate‐dominated material indicates that the production and accumulation of these two subpools of DOM in sea ice brines is, to some extent, decoupled. Article in Journal/Newspaper Antarc* Antarctic Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research 116 G3 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Sea ice plays a dynamic role in the air‐sea exchange of CO2. In addition to abiotic inorganic carbon fluxes, an active microbial community produces and remineralizes organic carbon, which can accumulate in sea ice brines as dissolved organic matter (DOM). In this study, the characteristics of DOM fluorescence in Antarctic sea ice brines from the western Weddell Sea were investigated. Two humic‐like components were identified, which were identical to those previously found to accumulate in the deep ocean and represent refractory material. Three amino‐acid‐like signals were found, one of which was unique to the brines and another that was spectrally very similar to tryptophan and found both in seawater and in brine samples. The tryptophan‐like fluorescence in the brines exhibited intensities higher than could be explained by conservative behavior during the freezing of seawater. Its fluorescence was correlated with the accumulation of nitrogen‐rich DOM to concentrations up to 900 mmol L−1 as dissolved organic carbon (DOC) and, thus, potentially represented proteins released by ice organisms. A second, nitrogen‐poor DOM fraction also accumulated in the brines to concentrations up to 200 mmol L−1 but was not correlated with any of the fluorescence signals identified. Because of the high C:N ratio and lack of fluorescence, this material is thought to represent extracellular polymeric substances, which consist primarily of polysaccharides. The clear grouping of the DOM pool into either proteinaceous or carbohydrate‐dominated material indicates that the production and accumulation of these two subpools of DOM in sea ice brines is, to some extent, decoupled. |
format |
Article in Journal/Newspaper |
author |
Stedmon, C. Thomas, D. Papadimitríou, S. Granskog, M. Dieckmann, Gerhard |
spellingShingle |
Stedmon, C. Thomas, D. Papadimitríou, S. Granskog, M. Dieckmann, Gerhard Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines |
author_facet |
Stedmon, C. Thomas, D. Papadimitríou, S. Granskog, M. Dieckmann, Gerhard |
author_sort |
Stedmon, C. |
title |
Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines |
title_short |
Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines |
title_full |
Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines |
title_fullStr |
Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines |
title_full_unstemmed |
Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines |
title_sort |
using fluorescence to characterize dissolved organic matter in antarctic sea ice brines |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2011 |
url |
https://epic.awi.de/id/eprint/24551/ https://epic.awi.de/id/eprint/24551/1/Stedmon_et_al_2011JGR-Bio.pdf https://doi.org/10.1029/2011JG001716 https://hdl.handle.net/10013/epic.38281 https://hdl.handle.net/10013/epic.38281.d001 |
genre |
Antarc* Antarctic Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Weddell Sea |
op_source |
EPIC3Journal of Geophysical Research-Biogeosciences, AMER GEOPHYSICAL UNION, 116(G03027), pp. 1-9, ISSN: 0148-0227 |
op_relation |
https://epic.awi.de/id/eprint/24551/1/Stedmon_et_al_2011JGR-Bio.pdf https://hdl.handle.net/10013/epic.38281.d001 Stedmon, C. , Thomas, D. , Papadimitríou, S. , Granskog, M. and Dieckmann, G. (2011) Using fluorescence to characterize dissolved organic matter in Antarctic sea ice brines , Journal of Geophysical Research-Biogeosciences, 116 (G03027), pp. 1-9 . doi:10.1029/2011JG001716 <https://doi.org/10.1029/2011JG001716> , hdl:10013/epic.38281 |
op_doi |
https://doi.org/10.1029/2011JG001716 |
container_title |
Journal of Geophysical Research |
container_volume |
116 |
container_issue |
G3 |
_version_ |
1810493704325038080 |