Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum
Variations in the silicon stable isotopic composition (δ30Si) of sedimentary biogenic silica (BSi) are used to reconstruct the utilization level of dissolved silicic acid (DSi) by diatoms in the geological past and to explore the influence of diatoms on past oceanic biogeochemistry and climate. A La...
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ftawi:oai:epic.awi.de:47234 2023-05-15T13:45:21+02:00 Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum Gao, Shuang Wolf-Gladrow, Dieter Voelker, Christoph 2018-02-14 application/pdf https://epic.awi.de/id/eprint/47234/ https://epic.awi.de/id/eprint/47234/1/d30Si_talk_ASLO2018.pdf https://hdl.handle.net/10013/epic.b7822a63-38e3-42a8-bd29-a6fd1eded2fb https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/47234/1/d30Si_talk_ASLO2018.pdf https://hdl.handle.net/ Gao, S. , Wolf-Gladrow, D. orcid:0000-0001-9531-8668 and Voelker, C. orcid:0000-0003-3032-114X (2018) Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum , Ocean Sciences Meeting, Portland, Oregon, USA, 11 February 2018 - 16 February 2018 . hdl:10013/epic.b7822a63-38e3-42a8-bd29-a6fd1eded2fb EPIC3Ocean Sciences Meeting, Portland, Oregon, USA, 2018-02-11-2018-02-16 Conference notRev 2018 ftawi 2021-12-24T15:43:52Z Variations in the silicon stable isotopic composition (δ30Si) of sedimentary biogenic silica (BSi) are used to reconstruct the utilization level of dissolved silicic acid (DSi) by diatoms in the geological past and to explore the influence of diatoms on past oceanic biogeochemistry and climate. A Last Glacial Maximum (LGM) climate simulation has been performed with a coupled ocean-sediment model that includes a prognostic formulation of BSi production with concurrent silicon isotopic fractionation. The model results show reduced DSi utilization by diatoms in high latitudes during the LGM, likely due to the extended ice cover in the model. There is a decrease in BSi export production in the Southern Ocean during the LGM compared to a present-day climate experiment. This leads to an increased equator-ward transport of DSi in Subantarctic Mode Water and Antarctic Intermediate Water, and a shift in the distribution of DSi from the deep Pacific into the deep Atlantic. The mean δ30Si value of DSi in the upper ocean shows a 0.14 per mil decrease in the LGM experiment, while there is an increase in the low-latitude Pacific compared with the present-day experiment. In the Pacific and Indian Ocean the slopes of the surface Si(OH)4~ Conference Object Antarc* Antarctic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Indian Pacific Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
Variations in the silicon stable isotopic composition (δ30Si) of sedimentary biogenic silica (BSi) are used to reconstruct the utilization level of dissolved silicic acid (DSi) by diatoms in the geological past and to explore the influence of diatoms on past oceanic biogeochemistry and climate. A Last Glacial Maximum (LGM) climate simulation has been performed with a coupled ocean-sediment model that includes a prognostic formulation of BSi production with concurrent silicon isotopic fractionation. The model results show reduced DSi utilization by diatoms in high latitudes during the LGM, likely due to the extended ice cover in the model. There is a decrease in BSi export production in the Southern Ocean during the LGM compared to a present-day climate experiment. This leads to an increased equator-ward transport of DSi in Subantarctic Mode Water and Antarctic Intermediate Water, and a shift in the distribution of DSi from the deep Pacific into the deep Atlantic. The mean δ30Si value of DSi in the upper ocean shows a 0.14 per mil decrease in the LGM experiment, while there is an increase in the low-latitude Pacific compared with the present-day experiment. In the Pacific and Indian Ocean the slopes of the surface Si(OH)4~ |
format |
Conference Object |
author |
Gao, Shuang Wolf-Gladrow, Dieter Voelker, Christoph |
spellingShingle |
Gao, Shuang Wolf-Gladrow, Dieter Voelker, Christoph Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum |
author_facet |
Gao, Shuang Wolf-Gladrow, Dieter Voelker, Christoph |
author_sort |
Gao, Shuang |
title |
Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum |
title_short |
Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum |
title_full |
Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum |
title_fullStr |
Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum |
title_full_unstemmed |
Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum |
title_sort |
simulating the distribution of stable silicon isotopes in the last glacial maximum |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/47234/ https://epic.awi.de/id/eprint/47234/1/d30Si_talk_ASLO2018.pdf https://hdl.handle.net/10013/epic.b7822a63-38e3-42a8-bd29-a6fd1eded2fb https://hdl.handle.net/ |
geographic |
Antarctic Indian Pacific Southern Ocean |
geographic_facet |
Antarctic Indian Pacific Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
EPIC3Ocean Sciences Meeting, Portland, Oregon, USA, 2018-02-11-2018-02-16 |
op_relation |
https://epic.awi.de/id/eprint/47234/1/d30Si_talk_ASLO2018.pdf https://hdl.handle.net/ Gao, S. , Wolf-Gladrow, D. orcid:0000-0001-9531-8668 and Voelker, C. orcid:0000-0003-3032-114X (2018) Simulating the distribution of stable silicon isotopes in the Last Glacial Maximum , Ocean Sciences Meeting, Portland, Oregon, USA, 11 February 2018 - 16 February 2018 . hdl:10013/epic.b7822a63-38e3-42a8-bd29-a6fd1eded2fb |
_version_ |
1766221222836699136 |