Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes
Changes in deep ocean carbonate chemistry have profound implications for glacial-interglacial atmospheric CO2 changes. Here, we review deep ocean carbonate ion concentration ([CO2- 3]) changes based on the benthic foraminiferal boron-to-calcium ratio (B/Ca) and their links to global carbon reorganiz...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/64778 2023-05-15T18:25:34+02:00 Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes Yu, Jimin Anderson, Robert F. Rohling, Eelco 2015-12-10T23:15:45Z http://hdl.handle.net/1885/64778 unknown Oceanography Society 1042-8275 http://hdl.handle.net/1885/64778 Oceanography Journal article 2015 ftanucanberra 2015-12-21T23:42:09Z Changes in deep ocean carbonate chemistry have profound implications for glacial-interglacial atmospheric CO2 changes. Here, we review deep ocean carbonate ion concentration ([CO2- 3]) changes based on the benthic foraminiferal boron-to-calcium ratio (B/Ca) and their links to global carbon reorganization since the last ice age. Existing deep ocean [CO2- 3] reconstructions are consistent with changes in the biological pump, in ocean stratification, and in the associated oceanic alkalinity inventory as key mechanisms for modulating atmospheric CO2 on glacialinterglacial time scales. We find that the global mean deep ocean [CO2- 3] was roughly similar between the Last Glacial Maximum (LGM; 18,000-22,000 years ago) and the Late Holocene (0-5000 years ago). In view of elevated glacial surface [CO2- 3], this indicates enhanced storage of respiratory carbon in a more alkaline deep ocean during the LGM. During early deglaciation, rising [CO2- 3] at three locations in the deep ocean suggests a release of deep-sea CO2 to the atmosphere, probably via the Southern Ocean. Both increased late deglacial carbonate burial in deep-sea sediments due to elevated [CO2- 3] and Holocene expansion of coral reefs on newly flooded continental shelves depleted global ocean alkalinity, which reduced CO2 solubility in seawater and contributed to atmospheric CO2 rises at these times. Article in Journal/Newspaper Southern Ocean Australian National University: ANU Digital Collections Southern Ocean |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
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description |
Changes in deep ocean carbonate chemistry have profound implications for glacial-interglacial atmospheric CO2 changes. Here, we review deep ocean carbonate ion concentration ([CO2- 3]) changes based on the benthic foraminiferal boron-to-calcium ratio (B/Ca) and their links to global carbon reorganization since the last ice age. Existing deep ocean [CO2- 3] reconstructions are consistent with changes in the biological pump, in ocean stratification, and in the associated oceanic alkalinity inventory as key mechanisms for modulating atmospheric CO2 on glacialinterglacial time scales. We find that the global mean deep ocean [CO2- 3] was roughly similar between the Last Glacial Maximum (LGM; 18,000-22,000 years ago) and the Late Holocene (0-5000 years ago). In view of elevated glacial surface [CO2- 3], this indicates enhanced storage of respiratory carbon in a more alkaline deep ocean during the LGM. During early deglaciation, rising [CO2- 3] at three locations in the deep ocean suggests a release of deep-sea CO2 to the atmosphere, probably via the Southern Ocean. Both increased late deglacial carbonate burial in deep-sea sediments due to elevated [CO2- 3] and Holocene expansion of coral reefs on newly flooded continental shelves depleted global ocean alkalinity, which reduced CO2 solubility in seawater and contributed to atmospheric CO2 rises at these times. |
format |
Article in Journal/Newspaper |
author |
Yu, Jimin Anderson, Robert F. Rohling, Eelco |
spellingShingle |
Yu, Jimin Anderson, Robert F. Rohling, Eelco Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
author_facet |
Yu, Jimin Anderson, Robert F. Rohling, Eelco |
author_sort |
Yu, Jimin |
title |
Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
title_short |
Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
title_full |
Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
title_fullStr |
Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
title_full_unstemmed |
Deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
title_sort |
deep ocean carbonate chemistry and glacial-interglacial atmospheric co2 changes |
publisher |
Oceanography Society |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/64778 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Oceanography |
op_relation |
1042-8275 http://hdl.handle.net/1885/64778 |
_version_ |
1766207110192824320 |