Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea
As a major gateway from the Pacific to the open Arctic Ocean, biogeochemical transformations of nutrients in the Chukchi Sea are important for understanding the Arctic ecosystem as a whole. This study examines the biogeochemical cycling of the macronutrient phosphorus (P) relative to carbon (C) and...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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ftclarkuniv:oai:commons.clarku.edu:faculty_geography-1204 2023-09-05T13:16:58+02:00 Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea Piper, Meryssa M. Benitez-Nelson, Claudia R. Frey, Karen E. Mills, Matthew M. Pal, Sharmila 2016-08-01T07:00:00Z https://commons.clarku.edu/faculty_geography/205 https://doi.org/10.1016/j.dsr2.2016.05.009 unknown Clark Digital Commons https://commons.clarku.edu/faculty_geography/205 doi:10.1016/j.dsr2.2016.05.009 https://doi.org/10.1016/j.dsr2.2016.05.009 Geography Alaska Chukchi Sea phosphorus polar region sea ice USA water column Climate Oceanography text 2016 ftclarkuniv https://doi.org/10.1016/j.dsr2.2016.05.009 2023-08-14T06:15:24Z As a major gateway from the Pacific to the open Arctic Ocean, biogeochemical transformations of nutrients in the Chukchi Sea are important for understanding the Arctic ecosystem as a whole. This study examines the biogeochemical cycling of the macronutrient phosphorus (P) relative to carbon (C) and nitrogen (N) in the eastern Chukchi Sea during the ICESCAPE mission. Sea ice and water column dissolved and particulate P samples were collected during summer expeditions in 2010 (n=543) and 2011 (n=553). Nearly all forms of P were higher in Pacific Winter Waters (PWW), indicating the potential importance of PWW to Chukchi Sea nutrient pools. Annual means of P concentrations in all its forms in the offshore waters throughout the Chukchi Sea were also consistently higher (TP2010=1.56±0.61 µM, TP2011=1.67±0.68 µM) relative to waters inshore and within the Alaska Coastal Current (ACC), suggesting coastal inputs were relatively minor during our sampling. Rather, biological modification of P pools dominated, with 30–40% of the total dissolved P pool (TDP) and nearly 50% of the total particulate P pool (TPP) comprised of organic P. Nutrient analyses of first year sea ice suggest that sea ice melt contains highly variable P concentrations that span an order of magnitude depending on particulate matter content. As such, sea ice melt may contribute significant nutrients to summer waters on a transient basis. Low N:P ratios (<2) within the mixed layer are consistent with summertime N limitation of biological production and demonstrate that the Chukchi Sea is a major source of excess P to other regions of the Arctic Ocean. Deeper water column dissolved N:P ratios of 7–9.1, while lower than the canonical Redfield ratio, are consistent with particulate N:P ratios of a diatom-dominated biological community. Combined, results suggest that the eastern Chukchi Sea plays an important role in the composition and magnitude of P that ultimately reaches other Arctic Ocean waters. Text Arctic Arctic Ocean Chukchi Chukchi Sea Sea ice Alaska Clark University: Clark Digital Commons Arctic Arctic Ocean Chukchi Sea Pacific Deep Sea Research Part II: Topical Studies in Oceanography 130 76 87 |
institution |
Open Polar |
collection |
Clark University: Clark Digital Commons |
op_collection_id |
ftclarkuniv |
language |
unknown |
topic |
Alaska Chukchi Sea phosphorus polar region sea ice USA water column Climate Oceanography |
spellingShingle |
Alaska Chukchi Sea phosphorus polar region sea ice USA water column Climate Oceanography Piper, Meryssa M. Benitez-Nelson, Claudia R. Frey, Karen E. Mills, Matthew M. Pal, Sharmila Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea |
topic_facet |
Alaska Chukchi Sea phosphorus polar region sea ice USA water column Climate Oceanography |
description |
As a major gateway from the Pacific to the open Arctic Ocean, biogeochemical transformations of nutrients in the Chukchi Sea are important for understanding the Arctic ecosystem as a whole. This study examines the biogeochemical cycling of the macronutrient phosphorus (P) relative to carbon (C) and nitrogen (N) in the eastern Chukchi Sea during the ICESCAPE mission. Sea ice and water column dissolved and particulate P samples were collected during summer expeditions in 2010 (n=543) and 2011 (n=553). Nearly all forms of P were higher in Pacific Winter Waters (PWW), indicating the potential importance of PWW to Chukchi Sea nutrient pools. Annual means of P concentrations in all its forms in the offshore waters throughout the Chukchi Sea were also consistently higher (TP2010=1.56±0.61 µM, TP2011=1.67±0.68 µM) relative to waters inshore and within the Alaska Coastal Current (ACC), suggesting coastal inputs were relatively minor during our sampling. Rather, biological modification of P pools dominated, with 30–40% of the total dissolved P pool (TDP) and nearly 50% of the total particulate P pool (TPP) comprised of organic P. Nutrient analyses of first year sea ice suggest that sea ice melt contains highly variable P concentrations that span an order of magnitude depending on particulate matter content. As such, sea ice melt may contribute significant nutrients to summer waters on a transient basis. Low N:P ratios (<2) within the mixed layer are consistent with summertime N limitation of biological production and demonstrate that the Chukchi Sea is a major source of excess P to other regions of the Arctic Ocean. Deeper water column dissolved N:P ratios of 7–9.1, while lower than the canonical Redfield ratio, are consistent with particulate N:P ratios of a diatom-dominated biological community. Combined, results suggest that the eastern Chukchi Sea plays an important role in the composition and magnitude of P that ultimately reaches other Arctic Ocean waters. |
format |
Text |
author |
Piper, Meryssa M. Benitez-Nelson, Claudia R. Frey, Karen E. Mills, Matthew M. Pal, Sharmila |
author_facet |
Piper, Meryssa M. Benitez-Nelson, Claudia R. Frey, Karen E. Mills, Matthew M. Pal, Sharmila |
author_sort |
Piper, Meryssa M. |
title |
Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea |
title_short |
Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea |
title_full |
Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea |
title_fullStr |
Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea |
title_full_unstemmed |
Dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the Chukchi Sea |
title_sort |
dissolved and particulate phosphorus distributions and elemental stoichiometry throughout the chukchi sea |
publisher |
Clark Digital Commons |
publishDate |
2016 |
url |
https://commons.clarku.edu/faculty_geography/205 https://doi.org/10.1016/j.dsr2.2016.05.009 |
geographic |
Arctic Arctic Ocean Chukchi Sea Pacific |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Pacific |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea Sea ice Alaska |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea Sea ice Alaska |
op_source |
Geography |
op_relation |
https://commons.clarku.edu/faculty_geography/205 doi:10.1016/j.dsr2.2016.05.009 https://doi.org/10.1016/j.dsr2.2016.05.009 |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.05.009 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
130 |
container_start_page |
76 |
op_container_end_page |
87 |
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