Microbial nitrogen cycling on the Greenland Ice Sheet
Nitrogen inputs and microbial nitrogen cycling were investigated along a 79 km transect into the Greenland Ice Sheet (GrIS) during the main ablation season in summer 2010. The depletion of dissolved nitrate and production of ammonium (relative to icemelt) in cryoconite holes on Leverett Glacier, wit...
Published in: | Biogeosciences |
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Language: | English |
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2018
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Online Access: | https://doi.org/10.5194/bg-9-2431-2012 https://www.biogeosciences.net/9/2431/2012/ |
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ftcopernicus:oai:publications.copernicus.org:bg13071 2023-05-15T16:21:05+02:00 Microbial nitrogen cycling on the Greenland Ice Sheet Telling, J. Stibal, M. Anesio, A. M. Tranter, M. Nias, I. Cook, J. Bellas, C. Lis, G. Wadham, J. L. Sole, A. Nienow, P. Hodson, A. 2018-09-27 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/bg-9-2431-2012 https://www.biogeosciences.net/9/2431/2012/ eng eng info:eu-repo/grantAgreement/EC/FP7/249171 doi:10.5194/bg-9-2431-2012 https://www.biogeosciences.net/9/2431/2012/ info:eu-repo/semantics/openAccess eISSN: 1726-4189 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/bg-9-2431-2012 2019-12-24T09:56:13Z Nitrogen inputs and microbial nitrogen cycling were investigated along a 79 km transect into the Greenland Ice Sheet (GrIS) during the main ablation season in summer 2010. The depletion of dissolved nitrate and production of ammonium (relative to icemelt) in cryoconite holes on Leverett Glacier, within 7.5 km of the ice sheet margin, suggested microbial uptake and ammonification respectively. Positive in situ acetylene assays indicated nitrogen fixation both in a debris-rich 100 m marginal zone and up to 5.7 km upslope on Leverett Glacier (with rates up to 16.3 μmoles C 2 H 4 m −2 day −1 ). No positive acetylene assays were detected > 5.7 km into the ablation zone of the ice sheet. Potential nitrogen fixation only occurred when concentrations of dissolved and sediment-bound inorganic nitrogen were undetectable. Estimates of nitrogen fluxes onto the transect suggest that nitrogen fixation is likely of minor importance to the overall nitrogen budget of Leverett Glacier and of negligible importance to the nitrogen budget on the main ice sheet itself. Nitrogen fixation is however potentially important as a source of nitrogen to microbial communities in the debris-rich marginal zone close to the terminus of the glacier, where nitrogen fixation may aid the colonization of subglacial and moraine-derived debris. Other/Unknown Material glacier Greenland Ice Sheet Leverett Glacier Copernicus Publications: E-Journals Greenland Leverett Glacier ENVELOPE(-147.583,-147.583,-85.633,-85.633) Biogeosciences 9 7 2431 2442 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Nitrogen inputs and microbial nitrogen cycling were investigated along a 79 km transect into the Greenland Ice Sheet (GrIS) during the main ablation season in summer 2010. The depletion of dissolved nitrate and production of ammonium (relative to icemelt) in cryoconite holes on Leverett Glacier, within 7.5 km of the ice sheet margin, suggested microbial uptake and ammonification respectively. Positive in situ acetylene assays indicated nitrogen fixation both in a debris-rich 100 m marginal zone and up to 5.7 km upslope on Leverett Glacier (with rates up to 16.3 μmoles C 2 H 4 m −2 day −1 ). No positive acetylene assays were detected > 5.7 km into the ablation zone of the ice sheet. Potential nitrogen fixation only occurred when concentrations of dissolved and sediment-bound inorganic nitrogen were undetectable. Estimates of nitrogen fluxes onto the transect suggest that nitrogen fixation is likely of minor importance to the overall nitrogen budget of Leverett Glacier and of negligible importance to the nitrogen budget on the main ice sheet itself. Nitrogen fixation is however potentially important as a source of nitrogen to microbial communities in the debris-rich marginal zone close to the terminus of the glacier, where nitrogen fixation may aid the colonization of subglacial and moraine-derived debris. |
format |
Other/Unknown Material |
author |
Telling, J. Stibal, M. Anesio, A. M. Tranter, M. Nias, I. Cook, J. Bellas, C. Lis, G. Wadham, J. L. Sole, A. Nienow, P. Hodson, A. |
spellingShingle |
Telling, J. Stibal, M. Anesio, A. M. Tranter, M. Nias, I. Cook, J. Bellas, C. Lis, G. Wadham, J. L. Sole, A. Nienow, P. Hodson, A. Microbial nitrogen cycling on the Greenland Ice Sheet |
author_facet |
Telling, J. Stibal, M. Anesio, A. M. Tranter, M. Nias, I. Cook, J. Bellas, C. Lis, G. Wadham, J. L. Sole, A. Nienow, P. Hodson, A. |
author_sort |
Telling, J. |
title |
Microbial nitrogen cycling on the Greenland Ice Sheet |
title_short |
Microbial nitrogen cycling on the Greenland Ice Sheet |
title_full |
Microbial nitrogen cycling on the Greenland Ice Sheet |
title_fullStr |
Microbial nitrogen cycling on the Greenland Ice Sheet |
title_full_unstemmed |
Microbial nitrogen cycling on the Greenland Ice Sheet |
title_sort |
microbial nitrogen cycling on the greenland ice sheet |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-9-2431-2012 https://www.biogeosciences.net/9/2431/2012/ |
long_lat |
ENVELOPE(-147.583,-147.583,-85.633,-85.633) |
geographic |
Greenland Leverett Glacier |
geographic_facet |
Greenland Leverett Glacier |
genre |
glacier Greenland Ice Sheet Leverett Glacier |
genre_facet |
glacier Greenland Ice Sheet Leverett Glacier |
op_source |
eISSN: 1726-4189 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/249171 doi:10.5194/bg-9-2431-2012 https://www.biogeosciences.net/9/2431/2012/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-9-2431-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
7 |
container_start_page |
2431 |
op_container_end_page |
2442 |
_version_ |
1766009097927262208 |