Dissolved organic nitrogen dynamics in the Arctic Ocean
Little is known about the distribution and dynamics of dissolved organic nitrogen (DON) within Arctic Ocean surface waters, though seasonal inputs from both rivers and marine phytoplankton production are likely important. Here we combine multiple datasets to provide the first quasi-synoptic view of...
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Language: | English |
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2013
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Online Access: | https://eprints.soton.ac.uk/357293/ |
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ftsouthampton:oai:eprints.soton.ac.uk:357293 2023-07-30T03:59:44+02:00 Dissolved organic nitrogen dynamics in the Arctic Ocean Letscher, Robert T. Hansell, Dennis A. Kadko, David Bates, Nicholas R. 2013-01-20 https://eprints.soton.ac.uk/357293/ English eng Letscher, Robert T., Hansell, Dennis A., Kadko, David and Bates, Nicholas R. (2013) Dissolved organic nitrogen dynamics in the Arctic Ocean. Marine Chemistry, 148, 1-9. (doi:10.1016/j.marchem.2012.10.002 <http://dx.doi.org/10.1016/j.marchem.2012.10.002>). Article PeerReviewed 2013 ftsouthampton https://doi.org/10.1016/j.marchem.2012.10.002 2023-07-09T21:49:12Z Little is known about the distribution and dynamics of dissolved organic nitrogen (DON) within Arctic Ocean surface waters, though seasonal inputs from both rivers and marine phytoplankton production are likely important. Here we combine multiple datasets to provide the first quasi-synoptic view of DON concentrations in the summertime Arctic Ocean Polar Surface Layer (PSL) and western Arctic shelves, and infer controlling processes. Distributions indicate inputs of DON by Arctic rivers followed by net consumption of up to 70% of this terrigenous material across the resulting salinity gradients over time scales of years. Coupling of DON losses to PSL residence times indicates first order decay constants (?) of 0.15 ± 0.07 yr? 1 and 0.08 ± 0.01 yr? 1 for terrigenous DON in the eastern and western Arctic systems, respectively. Riverine delivery of both inorganic and organic nitrogen have only a minor (< 15%) impact on Arctic shelf export production. In the Pacific Ocean-influenced Chukchi Sea, net biological production of ~ 2 ?M DON, representing ~ 8% of net community production, is observed in surface waters following seasonal sea-ice retreat. These findings highlight the contrasting roles and locations of terrigenous versus marine derived DON in the cycling of nitrogen in the surface Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Chukchi Chukchi Sea Phytoplankton Sea ice University of Southampton: e-Prints Soton Arctic Arctic Ocean Chukchi Sea Pacific Marine Chemistry 148 1 9 |
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Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Little is known about the distribution and dynamics of dissolved organic nitrogen (DON) within Arctic Ocean surface waters, though seasonal inputs from both rivers and marine phytoplankton production are likely important. Here we combine multiple datasets to provide the first quasi-synoptic view of DON concentrations in the summertime Arctic Ocean Polar Surface Layer (PSL) and western Arctic shelves, and infer controlling processes. Distributions indicate inputs of DON by Arctic rivers followed by net consumption of up to 70% of this terrigenous material across the resulting salinity gradients over time scales of years. Coupling of DON losses to PSL residence times indicates first order decay constants (?) of 0.15 ± 0.07 yr? 1 and 0.08 ± 0.01 yr? 1 for terrigenous DON in the eastern and western Arctic systems, respectively. Riverine delivery of both inorganic and organic nitrogen have only a minor (< 15%) impact on Arctic shelf export production. In the Pacific Ocean-influenced Chukchi Sea, net biological production of ~ 2 ?M DON, representing ~ 8% of net community production, is observed in surface waters following seasonal sea-ice retreat. These findings highlight the contrasting roles and locations of terrigenous versus marine derived DON in the cycling of nitrogen in the surface Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
Letscher, Robert T. Hansell, Dennis A. Kadko, David Bates, Nicholas R. |
spellingShingle |
Letscher, Robert T. Hansell, Dennis A. Kadko, David Bates, Nicholas R. Dissolved organic nitrogen dynamics in the Arctic Ocean |
author_facet |
Letscher, Robert T. Hansell, Dennis A. Kadko, David Bates, Nicholas R. |
author_sort |
Letscher, Robert T. |
title |
Dissolved organic nitrogen dynamics in the Arctic Ocean |
title_short |
Dissolved organic nitrogen dynamics in the Arctic Ocean |
title_full |
Dissolved organic nitrogen dynamics in the Arctic Ocean |
title_fullStr |
Dissolved organic nitrogen dynamics in the Arctic Ocean |
title_full_unstemmed |
Dissolved organic nitrogen dynamics in the Arctic Ocean |
title_sort |
dissolved organic nitrogen dynamics in the arctic ocean |
publishDate |
2013 |
url |
https://eprints.soton.ac.uk/357293/ |
geographic |
Arctic Arctic Ocean Chukchi Sea Pacific |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Pacific |
genre |
Arctic Arctic Arctic Ocean Chukchi Chukchi Sea Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Chukchi Chukchi Sea Phytoplankton Sea ice |
op_relation |
Letscher, Robert T., Hansell, Dennis A., Kadko, David and Bates, Nicholas R. (2013) Dissolved organic nitrogen dynamics in the Arctic Ocean. Marine Chemistry, 148, 1-9. (doi:10.1016/j.marchem.2012.10.002 <http://dx.doi.org/10.1016/j.marchem.2012.10.002>). |
op_doi |
https://doi.org/10.1016/j.marchem.2012.10.002 |
container_title |
Marine Chemistry |
container_volume |
148 |
container_start_page |
1 |
op_container_end_page |
9 |
_version_ |
1772810545777344512 |