Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin
International audience The silicon isotopic composition of silicic acid (δ 30 Si(OH) 4) and biogenic silica (δ 30 Si-bSiO 2) were measured for the first time in marine Arctic waters from the Mackenzie River delta to the deep Canada Basin in the late summer of 2009. In the upper 100 m of the water co...
Published in: | Global Biogeochemical Cycles |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2016
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295/document https://hal.archives-ouvertes.fr/hal-02881295/file/2015GB005277.pdf https://doi.org/10.1002/2015GB005277 |
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English |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Varela, D. Brzezinski, M. Beucher, C. Jones, J. Giesbrecht, K. Lansard, B. Mucci, A. Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience The silicon isotopic composition of silicic acid (δ 30 Si(OH) 4) and biogenic silica (δ 30 Si-bSiO 2) were measured for the first time in marine Arctic waters from the Mackenzie River delta to the deep Canada Basin in the late summer of 2009. In the upper 100 m of the water column, δ 30 Si(OH) 4 signals (+1.82‰ to +3.08‰) were negatively correlated with the relative contribution of Mackenzie River water. The biogenic Si isotope fractionation factor estimated using an open system model, 30 ε = À0.97 ± 0.17‰, agrees well with laboratory and global-ocean estimates. Nevertheless, the δ 30 Si dynamics of this region may be better represented by closed system isotope models that yield lower values of 30 ε, between À0.33‰ and À0.41‰, depending on how the contribution of sea-ice diatoms is incorporated. In the upper 400 m, δ 30 Si-bSiO 2 values were among the heaviest ever measured in marine suspended bSiO 2 (+2.03‰ to +3.51‰). A positive correlation between δ 30 Si-bSiO 2 and sea-ice cover implies that heavy signals can result from isotopically heavy sea-ice diatoms introduced to pelagic assemblages. Below the surface bSiO 2 production zone, the δ 30 Si(OH) 4 distribution followed that of major water masses. Vertical δ 30 Si(OH) 4 profiles showed a minimum (average of +1.84 ± 0.10‰) in the upper halocline (125-200 m) composed of modified Pacific water and heavier average values (+2.04 ± 0.11‰) in Atlantic water (300-500 m deep). In the Canada Basin Deep Water (below 2000 m), δ 30 Si(OH) 4 averaged +1.88 ± 0.12‰, which represents the most positive value ever measured anywhere in the deep ocean. Since most Si(OH) 4 enters the Arctic from shallow depths in the Atlantic Ocean, heavy deep Arctic δ 30 Si(OH) 4 signals likely reflect the influx of relatively heavy intermediate Atlantic waters. A box model simulation of the global marine δ 30 Si(OH) 4 distribution successfully reproduced the observed patterns, with the δ 30 Si(OH) 4 of the simulated deep Arctic Ocean being the heaviest of all ... |
author2 |
British Columbia School of Earth and Ocean Sciences Victoria (SEOS) University of Victoria Canada (UVIC) University of California Santa Barbara (UCSB) University of California Department of Ecology, Evolution and Marine Biology Santa Barbara (EEMB) University of California-University of California Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Océan et Interfaces (OCEANIS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Research Centre on the Dynamics of the Earth System (GEOTOP) Concordia University Montreal -École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Université du Québec à Montréal = University of Québec in Montréal (UQAM) |
format |
Article in Journal/Newspaper |
author |
Varela, D. Brzezinski, M. Beucher, C. Jones, J. Giesbrecht, K. Lansard, B. Mucci, A. |
author_facet |
Varela, D. Brzezinski, M. Beucher, C. Jones, J. Giesbrecht, K. Lansard, B. Mucci, A. |
author_sort |
Varela, D. |
title |
Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin |
title_short |
Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin |
title_full |
Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin |
title_fullStr |
Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin |
title_full_unstemmed |
Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin |
title_sort |
heavy silicon isotopic composition of silicic acid and biogenic silica in arctic waters over the beaufort shelf and the canada basin |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295/document https://hal.archives-ouvertes.fr/hal-02881295/file/2015GB005277.pdf https://doi.org/10.1002/2015GB005277 |
long_lat |
ENVELOPE(-142.500,-142.500,70.000,70.000) |
geographic |
Arctic Arctic Ocean Mackenzie River Canada Pacific Beaufort Shelf |
geographic_facet |
Arctic Arctic Ocean Mackenzie River Canada Pacific Beaufort Shelf |
genre |
Arctic Arctic Ocean canada basin Mackenzie river Sea ice |
genre_facet |
Arctic Arctic Ocean canada basin Mackenzie river Sea ice |
op_source |
ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.archives-ouvertes.fr/hal-02881295 Global Biogeochemical Cycles, American Geophysical Union, 2016, 30 (6), pp.804-824. ⟨10.1002/2015GB005277⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2015GB005277 hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295/document https://hal.archives-ouvertes.fr/hal-02881295/file/2015GB005277.pdf doi:10.1002/2015GB005277 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2015GB005277 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
6 |
container_start_page |
804 |
op_container_end_page |
824 |
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1766323678929223680 |
spelling |
ftccsdartic:oai:HAL:hal-02881295v1 2023-05-15T14:52:26+02:00 Heavy silicon isotopic composition of silicic acid and biogenic silica in Arctic waters over the Beaufort shelf and the Canada Basin Varela, D. Brzezinski, M. Beucher, C. Jones, J. Giesbrecht, K. Lansard, B. Mucci, A. British Columbia School of Earth and Ocean Sciences Victoria (SEOS) University of Victoria Canada (UVIC) University of California Santa Barbara (UCSB) University of California Department of Ecology, Evolution and Marine Biology Santa Barbara (EEMB) University of California-University of California Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Océan et Interfaces (OCEANIS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Research Centre on the Dynamics of the Earth System (GEOTOP) Concordia University Montreal -École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Université du Québec à Montréal = University of Québec in Montréal (UQAM) 2016-06 https://hal.archives-ouvertes.fr/hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295/document https://hal.archives-ouvertes.fr/hal-02881295/file/2015GB005277.pdf https://doi.org/10.1002/2015GB005277 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2015GB005277 hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295 https://hal.archives-ouvertes.fr/hal-02881295/document https://hal.archives-ouvertes.fr/hal-02881295/file/2015GB005277.pdf doi:10.1002/2015GB005277 info:eu-repo/semantics/OpenAccess ISSN: 0886-6236 EISSN: 1944-8224 Global Biogeochemical Cycles https://hal.archives-ouvertes.fr/hal-02881295 Global Biogeochemical Cycles, American Geophysical Union, 2016, 30 (6), pp.804-824. ⟨10.1002/2015GB005277⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1002/2015GB005277 2021-12-19T00:55:17Z International audience The silicon isotopic composition of silicic acid (δ 30 Si(OH) 4) and biogenic silica (δ 30 Si-bSiO 2) were measured for the first time in marine Arctic waters from the Mackenzie River delta to the deep Canada Basin in the late summer of 2009. In the upper 100 m of the water column, δ 30 Si(OH) 4 signals (+1.82‰ to +3.08‰) were negatively correlated with the relative contribution of Mackenzie River water. The biogenic Si isotope fractionation factor estimated using an open system model, 30 ε = À0.97 ± 0.17‰, agrees well with laboratory and global-ocean estimates. Nevertheless, the δ 30 Si dynamics of this region may be better represented by closed system isotope models that yield lower values of 30 ε, between À0.33‰ and À0.41‰, depending on how the contribution of sea-ice diatoms is incorporated. In the upper 400 m, δ 30 Si-bSiO 2 values were among the heaviest ever measured in marine suspended bSiO 2 (+2.03‰ to +3.51‰). A positive correlation between δ 30 Si-bSiO 2 and sea-ice cover implies that heavy signals can result from isotopically heavy sea-ice diatoms introduced to pelagic assemblages. Below the surface bSiO 2 production zone, the δ 30 Si(OH) 4 distribution followed that of major water masses. Vertical δ 30 Si(OH) 4 profiles showed a minimum (average of +1.84 ± 0.10‰) in the upper halocline (125-200 m) composed of modified Pacific water and heavier average values (+2.04 ± 0.11‰) in Atlantic water (300-500 m deep). In the Canada Basin Deep Water (below 2000 m), δ 30 Si(OH) 4 averaged +1.88 ± 0.12‰, which represents the most positive value ever measured anywhere in the deep ocean. Since most Si(OH) 4 enters the Arctic from shallow depths in the Atlantic Ocean, heavy deep Arctic δ 30 Si(OH) 4 signals likely reflect the influx of relatively heavy intermediate Atlantic waters. A box model simulation of the global marine δ 30 Si(OH) 4 distribution successfully reproduced the observed patterns, with the δ 30 Si(OH) 4 of the simulated deep Arctic Ocean being the heaviest of all ... Article in Journal/Newspaper Arctic Arctic Ocean canada basin Mackenzie river Sea ice Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Arctic Ocean Mackenzie River Canada Pacific Beaufort Shelf ENVELOPE(-142.500,-142.500,70.000,70.000) Global Biogeochemical Cycles 30 6 804 824 |