Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply
Major shifts in ocean circulation are thought to be responsible for abrupt changes in temperature and atmospheric CO2 during the last deglaciation, linked to variability in meridional heat transport and deep ocean carbon storage. There is also widespread evidence for shifts in biological production...
Published in: | Earth and Planetary Science Letters |
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ftoceanrep:oai:oceanrep.geomar.de:44214 2023-08-27T04:10:56+02:00 Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply Hendry, Katharine R. Gong, Xun Knorr, Gregor Pike, Jennifer Hall, Ian R. 2016 text https://oceanrep.geomar.de/id/eprint/44214/ https://oceanrep.geomar.de/id/eprint/44214/1/1-s2.0-S0012821X16000327-main.pdf https://doi.org/10.1016/j.epsl.2016.01.016 en eng Elsevier https://oceanrep.geomar.de/id/eprint/44214/1/1-s2.0-S0012821X16000327-main.pdf Hendry, K. R., Gong, X., Knorr, G., Pike, J. and Hall, I. R. (2016) Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply. Earth and Planetary Science Letters, 438 . pp. 122-129. DOI 10.1016/j.epsl.2016.01.016 <https://doi.org/10.1016/j.epsl.2016.01.016>. doi:10.1016/j.epsl.2016.01.016 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1016/j.epsl.2016.01.016 2023-08-06T23:19:54Z Major shifts in ocean circulation are thought to be responsible for abrupt changes in temperature and atmospheric CO2 during the last deglaciation, linked to variability in meridional heat transport and deep ocean carbon storage. There is also widespread evidence for shifts in biological production during these times of deglacial CO2 rise, including enhanced diatom production in regions such as the tropical Atlantic. However, it remains unclear as to whether this diatom production was driven by enhanced wind-driven upwelling or density-driven vertical mixing, or by elevated thermocline concentrations of silicic acid supplied to the surface at a constant rate. Here, we demonstrate that silicic acid supply at depth in the NE Atlantic was enhanced during the abrupt climate events of the deglaciation. We use marine sediment archives to show that an increase in diatom production during abrupt climate shifts could only occur in regions of the NE Atlantic where the deep supply of silicic acid could reach the surface. The associated changes are indicative of enhanced regional wind-driven upwelling and/or weakened stratification due to circulation changes during phases of weakened Atlantic meridional overturning. Globally near-synchronous pulses of diatom production and enhanced thermocline concentrations of silicic acid suggest that widespread deglacial surface-driven breakdown of stratification, linked to changes in atmospheric circulation, had major consequences for biological productivity and carbon cycling. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Earth and Planetary Science Letters 438 122 129 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Major shifts in ocean circulation are thought to be responsible for abrupt changes in temperature and atmospheric CO2 during the last deglaciation, linked to variability in meridional heat transport and deep ocean carbon storage. There is also widespread evidence for shifts in biological production during these times of deglacial CO2 rise, including enhanced diatom production in regions such as the tropical Atlantic. However, it remains unclear as to whether this diatom production was driven by enhanced wind-driven upwelling or density-driven vertical mixing, or by elevated thermocline concentrations of silicic acid supplied to the surface at a constant rate. Here, we demonstrate that silicic acid supply at depth in the NE Atlantic was enhanced during the abrupt climate events of the deglaciation. We use marine sediment archives to show that an increase in diatom production during abrupt climate shifts could only occur in regions of the NE Atlantic where the deep supply of silicic acid could reach the surface. The associated changes are indicative of enhanced regional wind-driven upwelling and/or weakened stratification due to circulation changes during phases of weakened Atlantic meridional overturning. Globally near-synchronous pulses of diatom production and enhanced thermocline concentrations of silicic acid suggest that widespread deglacial surface-driven breakdown of stratification, linked to changes in atmospheric circulation, had major consequences for biological productivity and carbon cycling. |
format |
Article in Journal/Newspaper |
author |
Hendry, Katharine R. Gong, Xun Knorr, Gregor Pike, Jennifer Hall, Ian R. |
spellingShingle |
Hendry, Katharine R. Gong, Xun Knorr, Gregor Pike, Jennifer Hall, Ian R. Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply |
author_facet |
Hendry, Katharine R. Gong, Xun Knorr, Gregor Pike, Jennifer Hall, Ian R. |
author_sort |
Hendry, Katharine R. |
title |
Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply |
title_short |
Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply |
title_full |
Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply |
title_fullStr |
Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply |
title_full_unstemmed |
Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply |
title_sort |
deglacial diatom production in the tropical north atlantic driven by enhanced silicic acid supply |
publisher |
Elsevier |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/44214/ https://oceanrep.geomar.de/id/eprint/44214/1/1-s2.0-S0012821X16000327-main.pdf https://doi.org/10.1016/j.epsl.2016.01.016 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/44214/1/1-s2.0-S0012821X16000327-main.pdf Hendry, K. R., Gong, X., Knorr, G., Pike, J. and Hall, I. R. (2016) Deglacial diatom production in the tropical North Atlantic driven by enhanced silicic acid supply. Earth and Planetary Science Letters, 438 . pp. 122-129. DOI 10.1016/j.epsl.2016.01.016 <https://doi.org/10.1016/j.epsl.2016.01.016>. doi:10.1016/j.epsl.2016.01.016 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2016.01.016 |
container_title |
Earth and Planetary Science Letters |
container_volume |
438 |
container_start_page |
122 |
op_container_end_page |
129 |
_version_ |
1775353328200318976 |