The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle
During most of the year, diatom production in the ice-covered Central Arctic Ocean (CAO) is limited by light availability and nutrient supply. Therefore, biological production is thought to be generally low, with higher biological production at the sea ice edge and over partially ice-free shelf area...
Published in: | Journal of Geophysical Research: Oceans |
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2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/58789/ https://oceanrep.geomar.de/id/eprint/58789/1/Liguori%20et%20al.pdf https://doi.org/10.1029/2021JC017352 |
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ftoceanrep:oai:oceanrep.geomar.de:58789 2024-02-11T09:59:30+01:00 The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle Liguori, Bianca T. P. Ehlert, Claudia Nöthig, Eva‐Maria Ooijen, Jan C. Pahnke, Katharina 2021-11-03 text https://oceanrep.geomar.de/id/eprint/58789/ https://oceanrep.geomar.de/id/eprint/58789/1/Liguori%20et%20al.pdf https://doi.org/10.1029/2021JC017352 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/58789/1/Liguori%20et%20al.pdf Liguori, B. T. P. , Ehlert, C., Nöthig, E., Ooijen, J. C. and Pahnke, K. (2021) The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle. Open Access Journal of Geophysical Research: Oceans, 126 (11). e2021JC017352. DOI 10.1029/2021JC017352 <https://doi.org/10.1029/2021JC017352>. doi:10.1029/2021JC017352 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1029/2021JC017352 2024-01-15T00:27:16Z During most of the year, diatom production in the ice-covered Central Arctic Ocean (CAO) is limited by light availability and nutrient supply. Therefore, biological production is thought to be generally low, with higher biological production at the sea ice edge and over partially ice-free shelf areas. The major surface ocean current in the CAO is the Transpolar Drift (TPD), which transports sea ice and water from the rivers and shelves of the Laptev and the East Siberian Seas across the CAO toward the Fram Strait, carrying high amounts of terrestrial-derived material over long distances. We used Si isotopes (δ30Si) to better understand the difference between lower and higher biological production areas and how the TPD potentially affects the Si cycle in the CAO. Our data show low dissolved Si concentrations ([DSi]) paired with high values of δ30Si-DSi in all surface samples indicating fractionation by diatoms. Specifically, outside the TPD influence, all nutrients were depleted and supply was limited due to stratified conditions, thus preventing further phytoplankton growth in the area during the sampling time in late summer-early fall. In contrast, under the TPD influence, diatom primary production was limited by low nitrate and strongly limited by light due to the presence of sea ice, even though [DSi] values were much higher than outside the TPD. Based on δ30Si, we could identify low but measurable DSi utilization in the TPD, potentially highlighting the importance of sea ice-attached diatoms transported to the CAO via the TPD for the Si cycle in this region. Key Points - Primary production and silicon utilization outside the Transpolar Drift are higher than under its influence due to more light availability - Primary production and lateral water transport under the Transpolar Drift influence were identified from silicon isotope composition - The Transpolar Drift delivers high dissolved silicon to the surface Arctic Ocean, a unique feature not seen in any other open ocean Article in Journal/Newspaper Arctic Arctic Arctic Ocean Fram Strait laptev Phytoplankton Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Arctic Ocean Journal of Geophysical Research: Oceans 126 11 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
During most of the year, diatom production in the ice-covered Central Arctic Ocean (CAO) is limited by light availability and nutrient supply. Therefore, biological production is thought to be generally low, with higher biological production at the sea ice edge and over partially ice-free shelf areas. The major surface ocean current in the CAO is the Transpolar Drift (TPD), which transports sea ice and water from the rivers and shelves of the Laptev and the East Siberian Seas across the CAO toward the Fram Strait, carrying high amounts of terrestrial-derived material over long distances. We used Si isotopes (δ30Si) to better understand the difference between lower and higher biological production areas and how the TPD potentially affects the Si cycle in the CAO. Our data show low dissolved Si concentrations ([DSi]) paired with high values of δ30Si-DSi in all surface samples indicating fractionation by diatoms. Specifically, outside the TPD influence, all nutrients were depleted and supply was limited due to stratified conditions, thus preventing further phytoplankton growth in the area during the sampling time in late summer-early fall. In contrast, under the TPD influence, diatom primary production was limited by low nitrate and strongly limited by light due to the presence of sea ice, even though [DSi] values were much higher than outside the TPD. Based on δ30Si, we could identify low but measurable DSi utilization in the TPD, potentially highlighting the importance of sea ice-attached diatoms transported to the CAO via the TPD for the Si cycle in this region. Key Points - Primary production and silicon utilization outside the Transpolar Drift are higher than under its influence due to more light availability - Primary production and lateral water transport under the Transpolar Drift influence were identified from silicon isotope composition - The Transpolar Drift delivers high dissolved silicon to the surface Arctic Ocean, a unique feature not seen in any other open ocean |
format |
Article in Journal/Newspaper |
author |
Liguori, Bianca T. P. Ehlert, Claudia Nöthig, Eva‐Maria Ooijen, Jan C. Pahnke, Katharina |
spellingShingle |
Liguori, Bianca T. P. Ehlert, Claudia Nöthig, Eva‐Maria Ooijen, Jan C. Pahnke, Katharina The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle |
author_facet |
Liguori, Bianca T. P. Ehlert, Claudia Nöthig, Eva‐Maria Ooijen, Jan C. Pahnke, Katharina |
author_sort |
Liguori, Bianca T. P. |
title |
The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle |
title_short |
The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle |
title_full |
The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle |
title_fullStr |
The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle |
title_full_unstemmed |
The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle |
title_sort |
transpolar drift influence on the arctic ocean silicon cycle |
publisher |
AGU (American Geophysical Union) |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/58789/ https://oceanrep.geomar.de/id/eprint/58789/1/Liguori%20et%20al.pdf https://doi.org/10.1029/2021JC017352 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Fram Strait laptev Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Fram Strait laptev Phytoplankton Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/58789/1/Liguori%20et%20al.pdf Liguori, B. T. P. , Ehlert, C., Nöthig, E., Ooijen, J. C. and Pahnke, K. (2021) The Transpolar Drift Influence on the Arctic Ocean Silicon Cycle. Open Access Journal of Geophysical Research: Oceans, 126 (11). e2021JC017352. DOI 10.1029/2021JC017352 <https://doi.org/10.1029/2021JC017352>. doi:10.1029/2021JC017352 |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2021JC017352 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
11 |
_version_ |
1790595380393541632 |