Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms
Seventeen inorganic germanium and silicon concentration profiles collected from the Atlantic, southwest Pacific, and Southern oceans are presented. A plot of germanium concentration versus silicon concentration produced a near-linear line with a slope of 0.760 × 10−6 (±0.004) and an intercept of 1.2...
Published in: | Global Biogeochemical Cycles |
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2010
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Online Access: | https://oceanrep.geomar.de/id/eprint/8663/ https://oceanrep.geomar.de/id/eprint/8663/1/2009GB003689.pdf https://doi.org/10.1029/2009GB003689 |
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ftoceanrep:oai:oceanrep.geomar.de:8663 2023-05-15T18:25:41+02:00 Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms Sutton, J. Ellwood, M. J. Maher, W. A. Croot, Peter 2010 text https://oceanrep.geomar.de/id/eprint/8663/ https://oceanrep.geomar.de/id/eprint/8663/1/2009GB003689.pdf https://doi.org/10.1029/2009GB003689 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/8663/1/2009GB003689.pdf Sutton, J., Ellwood, M. J., Maher, W. A. and Croot, P. (2010) Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms. Open Access Global Biogeochemical Cycles, 24 (2). GB2017. DOI 10.1029/2009GB003689 <https://doi.org/10.1029/2009GB003689>. doi:10.1029/2009GB003689 info:eu-repo/semantics/openAccess Article PeerReviewed 2010 ftoceanrep https://doi.org/10.1029/2009GB003689 2023-04-07T14:57:00Z Seventeen inorganic germanium and silicon concentration profiles collected from the Atlantic, southwest Pacific, and Southern oceans are presented. A plot of germanium concentration versus silicon concentration produced a near-linear line with a slope of 0.760 × 10−6 (±0.004) and an intercept of 1.27 (±0.24) pmol L−1 (r2 = 0.993, p < 0.001). When the germanium-to-silicon ratios (Ge/Si) were plotted versus depth and/or silicon concentrations, higher values are observed in surface waters (low in silicon) and decreased with depth (high in silicon). Germanium-to-silicon ratios in diatoms (0.608–1.03 × 10−6) and coupled seawater samples (0.471–7.46 × 10−6) collected from the Southern Ocean are also presented and show clear evidence for Ge/Si fractionation between the water and opal phases. Using a 10 box model (based on PANDORA), Ge/Si fractionation was modeled using three assumptions: (1) no fractionation, (2) fractionation using a constant distribution coefficient (KD) between the water and solid phase, and (3) fractionation simulated using Michaelis-Menten uptake kinetics for germanium and silicon via the silicon uptake system. Model runs indicated that only Ge/Si fractionation based on differences in the Michaelis-Menten uptake kinetics for germanium and silicon can adequately describe the data. The model output using this fractionation process produced a near linear line with a slope of 0.76 × 10−6 and an intercept of 0.92 (±0.28) pmol L−1, thus reflecting the oceanic data set. This result indicates that Ge/Si fractionation in the global ocean occurs as a result of subtle differences in the uptake of germanium and silicon via diatoms in surface waters. Article in Journal/Newspaper Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Pacific Southern Ocean Global Biogeochemical Cycles 24 2 n/a n/a |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Seventeen inorganic germanium and silicon concentration profiles collected from the Atlantic, southwest Pacific, and Southern oceans are presented. A plot of germanium concentration versus silicon concentration produced a near-linear line with a slope of 0.760 × 10−6 (±0.004) and an intercept of 1.27 (±0.24) pmol L−1 (r2 = 0.993, p < 0.001). When the germanium-to-silicon ratios (Ge/Si) were plotted versus depth and/or silicon concentrations, higher values are observed in surface waters (low in silicon) and decreased with depth (high in silicon). Germanium-to-silicon ratios in diatoms (0.608–1.03 × 10−6) and coupled seawater samples (0.471–7.46 × 10−6) collected from the Southern Ocean are also presented and show clear evidence for Ge/Si fractionation between the water and opal phases. Using a 10 box model (based on PANDORA), Ge/Si fractionation was modeled using three assumptions: (1) no fractionation, (2) fractionation using a constant distribution coefficient (KD) between the water and solid phase, and (3) fractionation simulated using Michaelis-Menten uptake kinetics for germanium and silicon via the silicon uptake system. Model runs indicated that only Ge/Si fractionation based on differences in the Michaelis-Menten uptake kinetics for germanium and silicon can adequately describe the data. The model output using this fractionation process produced a near linear line with a slope of 0.76 × 10−6 and an intercept of 0.92 (±0.28) pmol L−1, thus reflecting the oceanic data set. This result indicates that Ge/Si fractionation in the global ocean occurs as a result of subtle differences in the uptake of germanium and silicon via diatoms in surface waters. |
format |
Article in Journal/Newspaper |
author |
Sutton, J. Ellwood, M. J. Maher, W. A. Croot, Peter |
spellingShingle |
Sutton, J. Ellwood, M. J. Maher, W. A. Croot, Peter Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms |
author_facet |
Sutton, J. Ellwood, M. J. Maher, W. A. Croot, Peter |
author_sort |
Sutton, J. |
title |
Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms |
title_short |
Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms |
title_full |
Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms |
title_fullStr |
Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms |
title_full_unstemmed |
Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms |
title_sort |
oceanic distribution of inorganic germanium relative to silicon: germanium discrimination by diatoms |
publisher |
AGU (American Geophysical Union) |
publishDate |
2010 |
url |
https://oceanrep.geomar.de/id/eprint/8663/ https://oceanrep.geomar.de/id/eprint/8663/1/2009GB003689.pdf https://doi.org/10.1029/2009GB003689 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/8663/1/2009GB003689.pdf Sutton, J., Ellwood, M. J., Maher, W. A. and Croot, P. (2010) Oceanic distribution of inorganic germanium relative to silicon: Germanium discrimination by diatoms. Open Access Global Biogeochemical Cycles, 24 (2). GB2017. DOI 10.1029/2009GB003689 <https://doi.org/10.1029/2009GB003689>. doi:10.1029/2009GB003689 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2009GB003689 |
container_title |
Global Biogeochemical Cycles |
container_volume |
24 |
container_issue |
2 |
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_version_ |
1766207291040727040 |