Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago
Melt pond formation is a seasonal pan-Arctic process. During the thawing season, melt ponds may cover up to 90 % of the Arctic first-year sea ice (FYI) and 15 to 25 % of the multi-year sea ice (MYI). These pools of water lying at the surface of the sea ice cover are habitats for microorganisms and r...
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ftcopernicus:oai:publications.copernicus.org:bg62596 2023-05-15T14:28:45+02:00 Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago Gourdal, Margaux Lizotte, Martine Massé, Guillaume Gosselin, Michel Poulin, Michel Scarratt, Michael Charette, Joannie Levasseur, Maurice 2019-01-30 application/pdf https://doi.org/10.5194/bg-15-3169-2018 https://www.biogeosciences.net/15/3169/2018/ eng eng doi:10.5194/bg-15-3169-2018 https://www.biogeosciences.net/15/3169/2018/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-15-3169-2018 2019-12-24T09:50:14Z Melt pond formation is a seasonal pan-Arctic process. During the thawing season, melt ponds may cover up to 90 % of the Arctic first-year sea ice (FYI) and 15 to 25 % of the multi-year sea ice (MYI). These pools of water lying at the surface of the sea ice cover are habitats for microorganisms and represent a potential source of the biogenic gas dimethyl sulfide (DMS) for the atmosphere. Here we report on the concentrations and dynamics of DMS in nine melt ponds sampled in July 2014 in the Canadian Arctic Archipelago . DMS concentrations were under the detection limit ( < 0.01 nmol L −1 ) in freshwater melt ponds and increased linearly with salinity ( r s = 0.84, p ≤ 0.05) from ∼ 3 up to ∼ 6 nmol L −1 (avg. 3.7 ± 1.6 nmol L −1 ) in brackish melt ponds. This relationship suggests that the intrusion of seawater in melt ponds is a key physical mechanism responsible for the presence of DMS. Experiments were conducted with water from three melt ponds incubated for 24 h with and without the addition of two stable isotope-labelled precursors of DMS (dimethylsulfoniopropionate), (D6-DMSP) and dimethylsulfoxide ( 13 C -DMSO). Results show that de novo biological production of DMS can take place within brackish melt ponds through bacterial DMSP uptake and cleavage. Our data suggest that FYI melt ponds could represent a reservoir of DMS available for potential flux to the atmosphere. The importance of this ice-related source of DMS for the Arctic atmosphere is expected to increase as a response to the thinning of sea ice and the areal and temporal expansion of melt ponds on Arctic FYI. Text Arctic Archipelago Arctic Canadian Arctic Archipelago Sea ice Copernicus Publications: E-Journals Arctic Canadian Arctic Archipelago Biogeosciences 15 10 3169 3188 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Melt pond formation is a seasonal pan-Arctic process. During the thawing season, melt ponds may cover up to 90 % of the Arctic first-year sea ice (FYI) and 15 to 25 % of the multi-year sea ice (MYI). These pools of water lying at the surface of the sea ice cover are habitats for microorganisms and represent a potential source of the biogenic gas dimethyl sulfide (DMS) for the atmosphere. Here we report on the concentrations and dynamics of DMS in nine melt ponds sampled in July 2014 in the Canadian Arctic Archipelago . DMS concentrations were under the detection limit ( < 0.01 nmol L −1 ) in freshwater melt ponds and increased linearly with salinity ( r s = 0.84, p ≤ 0.05) from ∼ 3 up to ∼ 6 nmol L −1 (avg. 3.7 ± 1.6 nmol L −1 ) in brackish melt ponds. This relationship suggests that the intrusion of seawater in melt ponds is a key physical mechanism responsible for the presence of DMS. Experiments were conducted with water from three melt ponds incubated for 24 h with and without the addition of two stable isotope-labelled precursors of DMS (dimethylsulfoniopropionate), (D6-DMSP) and dimethylsulfoxide ( 13 C -DMSO). Results show that de novo biological production of DMS can take place within brackish melt ponds through bacterial DMSP uptake and cleavage. Our data suggest that FYI melt ponds could represent a reservoir of DMS available for potential flux to the atmosphere. The importance of this ice-related source of DMS for the Arctic atmosphere is expected to increase as a response to the thinning of sea ice and the areal and temporal expansion of melt ponds on Arctic FYI. |
format |
Text |
author |
Gourdal, Margaux Lizotte, Martine Massé, Guillaume Gosselin, Michel Poulin, Michel Scarratt, Michael Charette, Joannie Levasseur, Maurice |
spellingShingle |
Gourdal, Margaux Lizotte, Martine Massé, Guillaume Gosselin, Michel Poulin, Michel Scarratt, Michael Charette, Joannie Levasseur, Maurice Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago |
author_facet |
Gourdal, Margaux Lizotte, Martine Massé, Guillaume Gosselin, Michel Poulin, Michel Scarratt, Michael Charette, Joannie Levasseur, Maurice |
author_sort |
Gourdal, Margaux |
title |
Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago |
title_short |
Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago |
title_full |
Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago |
title_fullStr |
Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago |
title_full_unstemmed |
Dimethyl sulfide dynamics in first-year sea ice melt ponds in the Canadian Arctic Archipelago |
title_sort |
dimethyl sulfide dynamics in first-year sea ice melt ponds in the canadian arctic archipelago |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-15-3169-2018 https://www.biogeosciences.net/15/3169/2018/ |
geographic |
Arctic Canadian Arctic Archipelago |
geographic_facet |
Arctic Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago Sea ice |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago Sea ice |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-15-3169-2018 https://www.biogeosciences.net/15/3169/2018/ |
op_doi |
https://doi.org/10.5194/bg-15-3169-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
10 |
container_start_page |
3169 |
op_container_end_page |
3188 |
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1766302923107598336 |