Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean
We have reconstructed the surface water environment of the Arctic Ocean over the last ∼ 50,000 years using measurements of the organic nitrogen and carbon isotope ratios, carbonate and total organic carbon concentrations (TOC), and terrestrial biomarkers (lignin and long‐chain n‐alkanes) in four mul...
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ftpubman:oai:pure.mpg.de:item_3134934 2023-08-27T04:07:23+02:00 Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean Schubert, C. Stein, R. Calvert, S. 2001-04 application/pdf http://hdl.handle.net/21.11116/0000-0004-3F03-3 http://hdl.handle.net/21.11116/0000-0004-3F05-1 eng eng http://hdl.handle.net/21.11116/0000-0004-3F03-3 http://hdl.handle.net/21.11116/0000-0004-3F05-1 info:eu-repo/semantics/openAccess Paleoceanography and paleoclimatology info:eu-repo/semantics/article 2001 ftpubman 2023-08-02T00:01:11Z We have reconstructed the surface water environment of the Arctic Ocean over the last ∼ 50,000 years using measurements of the organic nitrogen and carbon isotope ratios, carbonate and total organic carbon concentrations (TOC), and terrestrial biomarkers (lignin and long‐chain n‐alkanes) in four multicores. Variations in nitrogen isotope ratios that are concordant with TOC and carbonate concentrations (representing foraminifera and excluding ice‐rafted‐debris) reflect differences in relative nutrient utilization of phytoplankton in the surface waters. However, δ15N variations also appear to be dependent on the stratification of the water column and therefore potentially track the exchange of nutrients between deep and surface waters. Low Last Glacial Maximum (LGM) δ15N values and higher Holocene values are opposite to those recorded in the Southern Ocean. The Arctic Ocean with higher nutrient utilization today compared to the LGM therefore acts as a counterpart to the Southern Ocean, although the global impact on carbon dioxide variations compared to the Southern Ocean is probably low. Article in Journal/Newspaper Arctic Arctic Ocean Foraminifera* Phytoplankton Southern Ocean Max Planck Society: MPG.PuRe Arctic Arctic Ocean Southern Ocean |
institution |
Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
We have reconstructed the surface water environment of the Arctic Ocean over the last ∼ 50,000 years using measurements of the organic nitrogen and carbon isotope ratios, carbonate and total organic carbon concentrations (TOC), and terrestrial biomarkers (lignin and long‐chain n‐alkanes) in four multicores. Variations in nitrogen isotope ratios that are concordant with TOC and carbonate concentrations (representing foraminifera and excluding ice‐rafted‐debris) reflect differences in relative nutrient utilization of phytoplankton in the surface waters. However, δ15N variations also appear to be dependent on the stratification of the water column and therefore potentially track the exchange of nutrients between deep and surface waters. Low Last Glacial Maximum (LGM) δ15N values and higher Holocene values are opposite to those recorded in the Southern Ocean. The Arctic Ocean with higher nutrient utilization today compared to the LGM therefore acts as a counterpart to the Southern Ocean, although the global impact on carbon dioxide variations compared to the Southern Ocean is probably low. |
format |
Article in Journal/Newspaper |
author |
Schubert, C. Stein, R. Calvert, S. |
spellingShingle |
Schubert, C. Stein, R. Calvert, S. Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean |
author_facet |
Schubert, C. Stein, R. Calvert, S. |
author_sort |
Schubert, C. |
title |
Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean |
title_short |
Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean |
title_full |
Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean |
title_fullStr |
Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean |
title_full_unstemmed |
Tracking nutrient and productivity variations over the last deglaciation in the Arctic Ocean |
title_sort |
tracking nutrient and productivity variations over the last deglaciation in the arctic ocean |
publishDate |
2001 |
url |
http://hdl.handle.net/21.11116/0000-0004-3F03-3 http://hdl.handle.net/21.11116/0000-0004-3F05-1 |
geographic |
Arctic Arctic Ocean Southern Ocean |
geographic_facet |
Arctic Arctic Ocean Southern Ocean |
genre |
Arctic Arctic Ocean Foraminifera* Phytoplankton Southern Ocean |
genre_facet |
Arctic Arctic Ocean Foraminifera* Phytoplankton Southern Ocean |
op_source |
Paleoceanography and paleoclimatology |
op_relation |
http://hdl.handle.net/21.11116/0000-0004-3F03-3 http://hdl.handle.net/21.11116/0000-0004-3F05-1 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1775348161623097344 |