Controls on biogenic silica burial in the Southern Ocean
Understanding the controls on opal export in the Southern Ocean can inform both the prediction of how the leakage of silicic acid from the Southern Ocean responds to climate and the interpretation of paleo-proxies. We have compiled a database of 185 230 Thorium-normalized opal burial rates and 493 o...
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Online Access: | https://doi.org/10.1002/2015GB005186 http://ecite.utas.edu.au/103451 |
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ftunivtasecite:oai:ecite.utas.edu.au:103451 2023-05-15T18:18:41+02:00 Controls on biogenic silica burial in the Southern Ocean Chase, Z Kohfeld, KE Matsumoto, K 2015 application/pdf https://doi.org/10.1002/2015GB005186 http://ecite.utas.edu.au/103451 en eng Amer Geophysical Union http://ecite.utas.edu.au/103451/2/Chase_et_al-2015-Global_Biogeochemical_Cycles.pdf http://dx.doi.org/10.1002/2015GB005186 http://purl.org/au-research/grants/arc/FT120100759 Chase, Z and Kohfeld, KE and Matsumoto, K, Controls on biogenic silica burial in the Southern Ocean, Global Biogeochemical Cycles, 29, (10) pp. 1599-1616. ISSN 0886-6236 (2015) [Refereed Article] http://ecite.utas.edu.au/103451 Earth Sciences Oceanography Chemical Oceanography Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.1002/2015GB005186 2019-12-13T22:04:55Z Understanding the controls on opal export in the Southern Ocean can inform both the prediction of how the leakage of silicic acid from the Southern Ocean responds to climate and the interpretation of paleo-proxies. We have compiled a database of 185 230 Thorium-normalized opal burial rates and 493 opal concentration measurements in Southern Ocean sediments and matched these with environmental climatologies. By subdividing the Southern Ocean on the basis of oceanographic regions and interpolating the opal burial rates, we estimate a total biogenic Si burial south of 40S of 2.3 1.0 Tmol Si yr −1 . In both the seasonally ice-covered and permanently ice-free regions we can explain 73% of opal burial variability from surface ocean properties. Where sea ice is present for at least part of the year, the length of the ice-free season determines the upper limit of opal burial in the underlying sediments. In the ice-free regions of the Southern Ocean, the supply of silicic acid through winter mixing is the most important factor. Our results do not support a strong role of iron in controlling opal burial. We do however find that satellite-derived net primary production increases with increasing (modeled) dust delivery. These findings support the decoupling between carbon and opal fluxes in the Southern Ocean. When corrected for opal dissolution, the observed opal fluxes are in reasonable agreement with fluxes simulated using an ocean biogeochemical model. However, the results suggest current preservation algorithms for opal could be improved by incorporating the composition of particle flux, not only its magnitude. Article in Journal/Newspaper Sea ice Southern Ocean eCite UTAS (University of Tasmania) Southern Ocean Global Biogeochemical Cycles 29 10 1599 1616 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Chemical Oceanography |
spellingShingle |
Earth Sciences Oceanography Chemical Oceanography Chase, Z Kohfeld, KE Matsumoto, K Controls on biogenic silica burial in the Southern Ocean |
topic_facet |
Earth Sciences Oceanography Chemical Oceanography |
description |
Understanding the controls on opal export in the Southern Ocean can inform both the prediction of how the leakage of silicic acid from the Southern Ocean responds to climate and the interpretation of paleo-proxies. We have compiled a database of 185 230 Thorium-normalized opal burial rates and 493 opal concentration measurements in Southern Ocean sediments and matched these with environmental climatologies. By subdividing the Southern Ocean on the basis of oceanographic regions and interpolating the opal burial rates, we estimate a total biogenic Si burial south of 40S of 2.3 1.0 Tmol Si yr −1 . In both the seasonally ice-covered and permanently ice-free regions we can explain 73% of opal burial variability from surface ocean properties. Where sea ice is present for at least part of the year, the length of the ice-free season determines the upper limit of opal burial in the underlying sediments. In the ice-free regions of the Southern Ocean, the supply of silicic acid through winter mixing is the most important factor. Our results do not support a strong role of iron in controlling opal burial. We do however find that satellite-derived net primary production increases with increasing (modeled) dust delivery. These findings support the decoupling between carbon and opal fluxes in the Southern Ocean. When corrected for opal dissolution, the observed opal fluxes are in reasonable agreement with fluxes simulated using an ocean biogeochemical model. However, the results suggest current preservation algorithms for opal could be improved by incorporating the composition of particle flux, not only its magnitude. |
format |
Article in Journal/Newspaper |
author |
Chase, Z Kohfeld, KE Matsumoto, K |
author_facet |
Chase, Z Kohfeld, KE Matsumoto, K |
author_sort |
Chase, Z |
title |
Controls on biogenic silica burial in the Southern Ocean |
title_short |
Controls on biogenic silica burial in the Southern Ocean |
title_full |
Controls on biogenic silica burial in the Southern Ocean |
title_fullStr |
Controls on biogenic silica burial in the Southern Ocean |
title_full_unstemmed |
Controls on biogenic silica burial in the Southern Ocean |
title_sort |
controls on biogenic silica burial in the southern ocean |
publisher |
Amer Geophysical Union |
publishDate |
2015 |
url |
https://doi.org/10.1002/2015GB005186 http://ecite.utas.edu.au/103451 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_relation |
http://ecite.utas.edu.au/103451/2/Chase_et_al-2015-Global_Biogeochemical_Cycles.pdf http://dx.doi.org/10.1002/2015GB005186 http://purl.org/au-research/grants/arc/FT120100759 Chase, Z and Kohfeld, KE and Matsumoto, K, Controls on biogenic silica burial in the Southern Ocean, Global Biogeochemical Cycles, 29, (10) pp. 1599-1616. ISSN 0886-6236 (2015) [Refereed Article] http://ecite.utas.edu.au/103451 |
op_doi |
https://doi.org/10.1002/2015GB005186 |
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Global Biogeochemical Cycles |
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29 |
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10 |
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1599 |
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1616 |
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