Anaerobic N 2 production in Arctic sea ice
We quantified anaerobic N 2 production through bacterial denitrification and anaerobic NH 4 + oxidation (anammox) in first‐year ice from Young Sound (74°N) and in an ice floe off Northeast Greenland (79°N). Bacterial denitrification activity (100–300 nmol N L −1 sea ice d −1 ) occurred in the lower...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2004.49.1.0086 2024-09-30T14:31:23+00:00 Anaerobic N 2 production in Arctic sea ice Rysgaard, Søren Glud, Ronnie Nøhr 2004 http://dx.doi.org/10.4319/lo.2004.49.1.0086 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2004.49.1.0086 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2004.49.1.0086 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 49, issue 1, page 86-94 ISSN 0024-3590 1939-5590 journal-article 2004 crwiley https://doi.org/10.4319/lo.2004.49.1.0086 2024-09-03T04:26:54Z We quantified anaerobic N 2 production through bacterial denitrification and anaerobic NH 4 + oxidation (anammox) in first‐year ice from Young Sound (74°N) and in an ice floe off Northeast Greenland (79°N). Bacterial denitrification activity (100–300 nmol N L −1 sea ice d −1 ) occurred in the lower 0.5 m of the sea ice, which had high concentrations of NO 3 − , NH 4 + , and dissolved organic carbon (DOC). Despite sea‐ice algal production in the lower sea‐ice layers, heterotrophic activity resulted in a net O 2 consumption of 13 µmol O 2 L −1 sea ice d −1 in the lower 0.5‐m ice layers. Together with melting of deoxygenated ice crystals, this led to anoxic conditions in the brine system favoring conditions for anaerobic NO 3 − reduction. Numbers of anaerobic NO 3 − ‐reducing bacteria in the same ice layers were high (1.1 × 10 5 cells ml −1 sea ice, corresponding to 1.2 × 10 6 cells ml −1 brine). Area‐integrated denitrification rates were 10–45 µmol N m −2 sea ice d −1 , which corresponds to 7–50% of the sediment activity in the area. Although the proportion of anammox to total N 2 production was up to 19% in layers of the ice floe from the Greenland Sea, the integrated rate only accounted for 0–5% of total NO 3 − reduction at the investigated localities. Article in Journal/Newspaper Arctic Greenland Greenland Sea Sea ice Wiley Online Library Arctic Greenland Limnology and Oceanography 49 1 86 94 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We quantified anaerobic N 2 production through bacterial denitrification and anaerobic NH 4 + oxidation (anammox) in first‐year ice from Young Sound (74°N) and in an ice floe off Northeast Greenland (79°N). Bacterial denitrification activity (100–300 nmol N L −1 sea ice d −1 ) occurred in the lower 0.5 m of the sea ice, which had high concentrations of NO 3 − , NH 4 + , and dissolved organic carbon (DOC). Despite sea‐ice algal production in the lower sea‐ice layers, heterotrophic activity resulted in a net O 2 consumption of 13 µmol O 2 L −1 sea ice d −1 in the lower 0.5‐m ice layers. Together with melting of deoxygenated ice crystals, this led to anoxic conditions in the brine system favoring conditions for anaerobic NO 3 − reduction. Numbers of anaerobic NO 3 − ‐reducing bacteria in the same ice layers were high (1.1 × 10 5 cells ml −1 sea ice, corresponding to 1.2 × 10 6 cells ml −1 brine). Area‐integrated denitrification rates were 10–45 µmol N m −2 sea ice d −1 , which corresponds to 7–50% of the sediment activity in the area. Although the proportion of anammox to total N 2 production was up to 19% in layers of the ice floe from the Greenland Sea, the integrated rate only accounted for 0–5% of total NO 3 − reduction at the investigated localities. |
format |
Article in Journal/Newspaper |
author |
Rysgaard, Søren Glud, Ronnie Nøhr |
spellingShingle |
Rysgaard, Søren Glud, Ronnie Nøhr Anaerobic N 2 production in Arctic sea ice |
author_facet |
Rysgaard, Søren Glud, Ronnie Nøhr |
author_sort |
Rysgaard, Søren |
title |
Anaerobic N 2 production in Arctic sea ice |
title_short |
Anaerobic N 2 production in Arctic sea ice |
title_full |
Anaerobic N 2 production in Arctic sea ice |
title_fullStr |
Anaerobic N 2 production in Arctic sea ice |
title_full_unstemmed |
Anaerobic N 2 production in Arctic sea ice |
title_sort |
anaerobic n 2 production in arctic sea ice |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.4319/lo.2004.49.1.0086 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2004.49.1.0086 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2004.49.1.0086 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland Sea Sea ice |
genre_facet |
Arctic Greenland Greenland Sea Sea ice |
op_source |
Limnology and Oceanography volume 49, issue 1, page 86-94 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2004.49.1.0086 |
container_title |
Limnology and Oceanography |
container_volume |
49 |
container_issue |
1 |
container_start_page |
86 |
op_container_end_page |
94 |
_version_ |
1811635966201298944 |