Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation
Today’s Sargasso Sea is nutrient starved, except for episodic upwelling events caused by wind-driven winter mixing and eddies. Enhanced diatom opal burial in Sargasso Sea sediments indicates that silicic acid, a limiting nutrient today, may have been more available in subsurface waters during Heinri...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D87W6C00 2023-05-15T17:32:44+02:00 Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation Hendry, Katharine R. Robinson, Laura F. McManus, Jerry F. Hays, James D. 2014 https://doi.org/10.7916/D87W6C00 English eng Nature Publishing Group https://doi.org/10.7916/D87W6C00 Silicic acid Oceanography--Research Climatic changes Chemical oceanography Biogeochemistry Articles 2014 ftcolumbiauniv https://doi.org/10.7916/D87W6C00 2019-04-04T08:14:03Z Today’s Sargasso Sea is nutrient starved, except for episodic upwelling events caused by wind-driven winter mixing and eddies. Enhanced diatom opal burial in Sargasso Sea sediments indicates that silicic acid, a limiting nutrient today, may have been more available in subsurface waters during Heinrich Stadials, millennial-scale climate perturbations of the last glacial and deglaciation. Here we use the geochemistry of opal-forming organisms from different water depths to demonstrate changes in silicic acid supply and utilization during the most recent Heinrich Stadial. We suggest that during the early phase (17.5–18 ka), wind-driven upwelling replenished silicic acid to the subsurface, resulting in low Si utilization. By 17 ka, stratification reduced the surface silicic acid supply leading to increased Si utilization efficiency. This abrupt shift in Si cycling would have contributed to high regional carbon export efficiency during the recent Heinrich Stadial, despite being a period of increasing atmospheric CO2. Article in Journal/Newspaper North Atlantic Columbia University: Academic Commons |
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Open Polar |
collection |
Columbia University: Academic Commons |
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ftcolumbiauniv |
language |
English |
topic |
Silicic acid Oceanography--Research Climatic changes Chemical oceanography Biogeochemistry |
spellingShingle |
Silicic acid Oceanography--Research Climatic changes Chemical oceanography Biogeochemistry Hendry, Katharine R. Robinson, Laura F. McManus, Jerry F. Hays, James D. Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation |
topic_facet |
Silicic acid Oceanography--Research Climatic changes Chemical oceanography Biogeochemistry |
description |
Today’s Sargasso Sea is nutrient starved, except for episodic upwelling events caused by wind-driven winter mixing and eddies. Enhanced diatom opal burial in Sargasso Sea sediments indicates that silicic acid, a limiting nutrient today, may have been more available in subsurface waters during Heinrich Stadials, millennial-scale climate perturbations of the last glacial and deglaciation. Here we use the geochemistry of opal-forming organisms from different water depths to demonstrate changes in silicic acid supply and utilization during the most recent Heinrich Stadial. We suggest that during the early phase (17.5–18 ka), wind-driven upwelling replenished silicic acid to the subsurface, resulting in low Si utilization. By 17 ka, stratification reduced the surface silicic acid supply leading to increased Si utilization efficiency. This abrupt shift in Si cycling would have contributed to high regional carbon export efficiency during the recent Heinrich Stadial, despite being a period of increasing atmospheric CO2. |
format |
Article in Journal/Newspaper |
author |
Hendry, Katharine R. Robinson, Laura F. McManus, Jerry F. Hays, James D. |
author_facet |
Hendry, Katharine R. Robinson, Laura F. McManus, Jerry F. Hays, James D. |
author_sort |
Hendry, Katharine R. |
title |
Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation |
title_short |
Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation |
title_full |
Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation |
title_fullStr |
Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation |
title_full_unstemmed |
Silicon isotopes indicate enhanced carbon export efficiency in the North Atlantic during deglaciation |
title_sort |
silicon isotopes indicate enhanced carbon export efficiency in the north atlantic during deglaciation |
publisher |
Nature Publishing Group |
publishDate |
2014 |
url |
https://doi.org/10.7916/D87W6C00 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://doi.org/10.7916/D87W6C00 |
op_doi |
https://doi.org/10.7916/D87W6C00 |
_version_ |
1766130977614069760 |