Microbially driven export of labile organic carbon from the Greenland ice sheet
Glaciers and ice sheets are significant sources of dissolved organic carbon and nutrients to downstream subglacial and marine ecosystems. Climatically driven increases in glacial runoff are expected to intensify the impact of exported nutrients on local and regional downstream environments. However,...
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ftuniaarhuspubl:oai:pure.atira.dk:publications/ef4bf588-4699-4603-878a-445536dac974 2024-01-14T10:07:00+01:00 Microbially driven export of labile organic carbon from the Greenland ice sheet Musilova, Michaela Tranter, Martyn Wadham, Jemma L. Telling, Jon Tedstone, Andrew J. Barbosa Anesio, Alexandre Magno 2017 https://pure.au.dk/portal/en/publications/ef4bf588-4699-4603-878a-445536dac974 eng eng https://pure.au.dk/portal/en/publications/ef4bf588-4699-4603-878a-445536dac974 info:eu-repo/semantics/restrictedAccess Musilova , M , Tranter , M , Wadham , J L , Telling , J , Tedstone , A J & Barbosa Anesio , A M 2017 , ' Microbially driven export of labile organic carbon from the Greenland ice sheet ' , Nature Geoscience , vol. 10 , pp. 360-365 . article 2017 ftuniaarhuspubl 2023-12-21T00:01:18Z Glaciers and ice sheets are significant sources of dissolved organic carbon and nutrients to downstream subglacial and marine ecosystems. Climatically driven increases in glacial runoff are expected to intensify the impact of exported nutrients on local and regional downstream environments. However, the origin and bioreactivity of dissolved organic carbon from glacier surfaces are not fully understood. Here, we present simultaneous measurements of gross primary production, community respiration, dissolved organic carbon composition and export from different surface habitats of the Greenland ice sheet, throughout the ablation season. We found that microbial production was significantly correlated with the concentration of labile dissolved organic species in glacier surface meltwater. Further, we determined that freely available organic compounds made up 62% of the dissolved organic carbon exported from the glacier surface through streams. We therefore conclude that microbial communities are the primary driver for labile dissolved organic carbon production and recycling on glacier surfaces, and that glacier dissolved organic carbon export is dependent on active microbial processes during the melt season. Article in Journal/Newspaper glacier Greenland Ice Sheet Aarhus University: Research Greenland |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
Glaciers and ice sheets are significant sources of dissolved organic carbon and nutrients to downstream subglacial and marine ecosystems. Climatically driven increases in glacial runoff are expected to intensify the impact of exported nutrients on local and regional downstream environments. However, the origin and bioreactivity of dissolved organic carbon from glacier surfaces are not fully understood. Here, we present simultaneous measurements of gross primary production, community respiration, dissolved organic carbon composition and export from different surface habitats of the Greenland ice sheet, throughout the ablation season. We found that microbial production was significantly correlated with the concentration of labile dissolved organic species in glacier surface meltwater. Further, we determined that freely available organic compounds made up 62% of the dissolved organic carbon exported from the glacier surface through streams. We therefore conclude that microbial communities are the primary driver for labile dissolved organic carbon production and recycling on glacier surfaces, and that glacier dissolved organic carbon export is dependent on active microbial processes during the melt season. |
format |
Article in Journal/Newspaper |
author |
Musilova, Michaela Tranter, Martyn Wadham, Jemma L. Telling, Jon Tedstone, Andrew J. Barbosa Anesio, Alexandre Magno |
spellingShingle |
Musilova, Michaela Tranter, Martyn Wadham, Jemma L. Telling, Jon Tedstone, Andrew J. Barbosa Anesio, Alexandre Magno Microbially driven export of labile organic carbon from the Greenland ice sheet |
author_facet |
Musilova, Michaela Tranter, Martyn Wadham, Jemma L. Telling, Jon Tedstone, Andrew J. Barbosa Anesio, Alexandre Magno |
author_sort |
Musilova, Michaela |
title |
Microbially driven export of labile organic carbon from the Greenland ice sheet |
title_short |
Microbially driven export of labile organic carbon from the Greenland ice sheet |
title_full |
Microbially driven export of labile organic carbon from the Greenland ice sheet |
title_fullStr |
Microbially driven export of labile organic carbon from the Greenland ice sheet |
title_full_unstemmed |
Microbially driven export of labile organic carbon from the Greenland ice sheet |
title_sort |
microbially driven export of labile organic carbon from the greenland ice sheet |
publishDate |
2017 |
url |
https://pure.au.dk/portal/en/publications/ef4bf588-4699-4603-878a-445536dac974 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
Musilova , M , Tranter , M , Wadham , J L , Telling , J , Tedstone , A J & Barbosa Anesio , A M 2017 , ' Microbially driven export of labile organic carbon from the Greenland ice sheet ' , Nature Geoscience , vol. 10 , pp. 360-365 . |
op_relation |
https://pure.au.dk/portal/en/publications/ef4bf588-4699-4603-878a-445536dac974 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1788061424296132608 |