Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities
Antarctic sea ice microalgal communities produce large amounts of the sulfur metabolite dimethylsulfoniopropionate (DMSP), a precursor of the climate relevant trace gas dimethylsulfide (DMS). Yet, little is known about the biogeochemical cycling of sea ice DMS and DMSP in the climate sensitive and a...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/271257 2023-05-15T13:51:43+02:00 Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities Wittek, Boris Carnat, Gauthier Tvärminne Polar Microbes Symposium (14-17/05/2018: Tvärminne Zoological Station, Finland) 2018-05-16 1 full-text file(s): application/vnd.openxmlformats-officedocument.presentationml.presentation http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/271257 https://dipot.ulb.ac.be/dspace/bitstream/2013/271257/3/Polar_Microbe_Symposium_2018.pptx en eng https://dipot.ulb.ac.be/dspace/bitstream/2013/271257/3/Polar_Microbe_Symposium_2018.pptx http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/271257 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Sciences de la terre et du cosmos Sea ice DMS DMSP Isotopes info:eu-repo/semantics/conferenceContribution info:ulb-repo/semantics/conferenceContribution info:ulb-repo/semantics/openurl/document 2018 ftunivbruxelles 2022-06-12T21:44:23Z Antarctic sea ice microalgal communities produce large amounts of the sulfur metabolite dimethylsulfoniopropionate (DMSP), a precursor of the climate relevant trace gas dimethylsulfide (DMS). Yet, little is known about the biogeochemical cycling of sea ice DMS and DMSP in the climate sensitive and aerosol-poor polar regions. Here we present the first measurement of the natural sulfur isotopic composition (34S/32S ratio, δ34S) of DMSP in sea ice, opening a new perspective on this complex cycle. δ34S values measured in sea ice cores collected in the Ross Sea and Weddell Sea reveal considerable variability across seasons, and between sea ice horizons (ranging from +10.6 to +23.6‰). This finding is remarkable considering the relative sulfur isotopic homogeneity of DMSP in the world surface oceans (between +18.9 and +20.3‰). We show evidence that DMSP δ34S variability correlates with variability in both sea ice taxonomic groups and physiochemical conditions of their brine habitat. This, combined with the isotopic homogeneity of the source sea ice sulfate (~+21‰), suggests that the observed sulfur fractionations may indicate distinct metabolic processes of DMSP synthesis under the extreme environmental stress of the brine system. These findings are not only significant for our understanding of the sea ice sulfur cycle and of the metabolic adaptations of microalgae in sea ice, but could also have implications for aerosols budget, paleoclimatic and geochemistry studies. 0 info:eu-repo/semantics/nonPublished Conference Object Antarc* Antarctic Ross Sea Sea ice Weddell Sea DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic Ross Sea Weddell Weddell Sea |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de la terre et du cosmos Sea ice DMS DMSP Isotopes |
spellingShingle |
Sciences de la terre et du cosmos Sea ice DMS DMSP Isotopes Wittek, Boris Carnat, Gauthier Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities |
topic_facet |
Sciences de la terre et du cosmos Sea ice DMS DMSP Isotopes |
description |
Antarctic sea ice microalgal communities produce large amounts of the sulfur metabolite dimethylsulfoniopropionate (DMSP), a precursor of the climate relevant trace gas dimethylsulfide (DMS). Yet, little is known about the biogeochemical cycling of sea ice DMS and DMSP in the climate sensitive and aerosol-poor polar regions. Here we present the first measurement of the natural sulfur isotopic composition (34S/32S ratio, δ34S) of DMSP in sea ice, opening a new perspective on this complex cycle. δ34S values measured in sea ice cores collected in the Ross Sea and Weddell Sea reveal considerable variability across seasons, and between sea ice horizons (ranging from +10.6 to +23.6‰). This finding is remarkable considering the relative sulfur isotopic homogeneity of DMSP in the world surface oceans (between +18.9 and +20.3‰). We show evidence that DMSP δ34S variability correlates with variability in both sea ice taxonomic groups and physiochemical conditions of their brine habitat. This, combined with the isotopic homogeneity of the source sea ice sulfate (~+21‰), suggests that the observed sulfur fractionations may indicate distinct metabolic processes of DMSP synthesis under the extreme environmental stress of the brine system. These findings are not only significant for our understanding of the sea ice sulfur cycle and of the metabolic adaptations of microalgae in sea ice, but could also have implications for aerosols budget, paleoclimatic and geochemistry studies. 0 info:eu-repo/semantics/nonPublished |
author2 |
Tvärminne Polar Microbes Symposium (14-17/05/2018: Tvärminne Zoological Station, Finland) |
format |
Conference Object |
author |
Wittek, Boris Carnat, Gauthier |
author_facet |
Wittek, Boris Carnat, Gauthier |
author_sort |
Wittek, Boris |
title |
Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities |
title_short |
Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities |
title_full |
Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities |
title_fullStr |
Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities |
title_full_unstemmed |
Sulfur isotope variability of DMS(P) production by Antarctic sea ice microbial communities |
title_sort |
sulfur isotope variability of dms(p) production by antarctic sea ice microbial communities |
publishDate |
2018 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/271257 https://dipot.ulb.ac.be/dspace/bitstream/2013/271257/3/Polar_Microbe_Symposium_2018.pptx |
geographic |
Antarctic Ross Sea Weddell Weddell Sea |
geographic_facet |
Antarctic Ross Sea Weddell Weddell Sea |
genre |
Antarc* Antarctic Ross Sea Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ross Sea Sea ice Weddell Sea |
op_relation |
https://dipot.ulb.ac.be/dspace/bitstream/2013/271257/3/Polar_Microbe_Symposium_2018.pptx http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/271257 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766255749362614272 |