Anaerobic N2 production in Arctic sea ice
We quantified anaerobic N2 production through bacterial denitrification and anaerobic NH oxidation (anammox)14 in first-year ice from Young Sound (748N) and in an ice floe off Northeast Greenland (798N). Bacterial denitrification activity (100–300 nmol N L21 sea ice d21) occurred in the lower 0.5 m...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
2004
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.5390 http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.484.5390 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.484.5390 2023-05-15T15:09:57+02:00 Anaerobic N2 production in Arctic sea ice Søren Rysgaard Ronnie Nøhr Glud The Pennsylvania State University CiteSeerX Archives 2004 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.5390 http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.5390 http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf text 2004 ftciteseerx 2016-01-08T08:06:31Z We quantified anaerobic N2 production through bacterial denitrification and anaerobic NH oxidation (anammox)14 in first-year ice from Young Sound (748N) and in an ice floe off Northeast Greenland (798N). Bacterial denitrification activity (100–300 nmol N L21 sea ice d21) occurred in the lower 0.5 m of the sea ice, which had high concentrations of NO, NH, and dissolved organic carbon (DOC). Despite sea-ice algal production in the lower sea-ice layers,2 13 4 heterotrophic activity resulted in a net O2 consumption of 13 mmol O2 L21 sea ice d21 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 reduction. Numbers of anaerobic NO-reducing bacteria in the same ice layers were2 23 3 high (1.1 3 105 cells ml21 sea ice, corresponding to 1.2 3 106 cells ml21 brine). Area-integrated denitrification rates were 10–45 mmol N m22 sea ice d21, which corresponds to 7–50 % of the sediment activity in the area. Although the proportion of anammox to total N2 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 reduction at the investigated localities.23 With a global average extent of 19–29 3 106 km2 (Gloer-sen et al. 1992), sea ice provides a vast low-temperature habitat for many species of bacteria, fungi, algae, protozoa Text Arctic Greenland Greenland Sea Sea ice Unknown Arctic Greenland |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
We quantified anaerobic N2 production through bacterial denitrification and anaerobic NH oxidation (anammox)14 in first-year ice from Young Sound (748N) and in an ice floe off Northeast Greenland (798N). Bacterial denitrification activity (100–300 nmol N L21 sea ice d21) occurred in the lower 0.5 m of the sea ice, which had high concentrations of NO, NH, and dissolved organic carbon (DOC). Despite sea-ice algal production in the lower sea-ice layers,2 13 4 heterotrophic activity resulted in a net O2 consumption of 13 mmol O2 L21 sea ice d21 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 reduction. Numbers of anaerobic NO-reducing bacteria in the same ice layers were2 23 3 high (1.1 3 105 cells ml21 sea ice, corresponding to 1.2 3 106 cells ml21 brine). Area-integrated denitrification rates were 10–45 mmol N m22 sea ice d21, which corresponds to 7–50 % of the sediment activity in the area. Although the proportion of anammox to total N2 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 reduction at the investigated localities.23 With a global average extent of 19–29 3 106 km2 (Gloer-sen et al. 1992), sea ice provides a vast low-temperature habitat for many species of bacteria, fungi, algae, protozoa |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Søren Rysgaard Ronnie Nøhr Glud |
spellingShingle |
Søren Rysgaard Ronnie Nøhr Glud Anaerobic N2 production in Arctic sea ice |
author_facet |
Søren Rysgaard Ronnie Nøhr Glud |
author_sort |
Søren Rysgaard |
title |
Anaerobic N2 production in Arctic sea ice |
title_short |
Anaerobic N2 production in Arctic sea ice |
title_full |
Anaerobic N2 production in Arctic sea ice |
title_fullStr |
Anaerobic N2 production in Arctic sea ice |
title_full_unstemmed |
Anaerobic N2 production in Arctic sea ice |
title_sort |
anaerobic n2 production in arctic sea ice |
publishDate |
2004 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.5390 http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland Sea Sea ice |
genre_facet |
Arctic Greenland Greenland Sea Sea ice |
op_source |
http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.484.5390 http://www.aslo.org/lo/toc/vol_49/issue_1/0086.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766341034380361728 |