Dissolution of biogenic silica in Southern Ocean surface sediments
Biogenic silica (BSi) is a major component in marine geochemical cycles and a suitable proxy for paleoproductivity. The Southern Ocean plays a key role in the biogeochemical cycle of silicon. For questions of opal preservation and to assess the global biogenic silica cycle it is important to underst...
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ftawi:oai:epic.awi.de:10956 2023-09-05T13:22:59+02:00 Dissolution of biogenic silica in Southern Ocean surface sediments Seeberg-Elverfeldt, J. Schlüter, Michael Schäfer, Angela 2004 application/pdf https://epic.awi.de/id/eprint/10956/ https://epic.awi.de/id/eprint/10956/1/See2004a.pdf https://hdl.handle.net/10013/epic.21421 https://hdl.handle.net/10013/epic.21421.d001 unknown https://epic.awi.de/id/eprint/10956/1/See2004a.pdf https://hdl.handle.net/10013/epic.21421.d001 Seeberg-Elverfeldt, J. , Schlüter, M. orcid:0000-0002-4997-3802 and Schäfer, A. orcid:0000-0003-1784-2979 (2004) Dissolution of biogenic silica in Southern Ocean surface sediments , XXVIII SCAR Open Science Conference, 26-28 July, Bremen, Germany. . hdl:10013/epic.21421 EPIC3XXVIII SCAR Open Science Conference, 26-28 July, Bremen, Germany. Conference notRev 2004 ftawi 2023-08-22T19:49:01Z Biogenic silica (BSi) is a major component in marine geochemical cycles and a suitable proxy for paleoproductivity. The Southern Ocean plays a key role in the biogeochemical cycle of silicon. For questions of opal preservation and to assess the global biogenic silica cycle it is important to understand the processes controlling BSi dissolution.The results from fitting the leaching curves, derived by wet-alkaline-extraction of biogenic silica, gives an estimate of the reactivity of biogenic silica in sediments. To get detailed information on kinetics and solubility of biogenic silica, continuously stirred flow-through experiments were performed. Use of flow through reactors allow quantification of dissolution rates and saturation concentrations under well defined conditions. Dissolution rates of sediment samples in stirred flow-through reactors were measured as a function of the degree of undersaturation by varying the silica acid concentrations or the flow rate of the inflow solution. By taking samples out of the reactors during the experiments we also get information about changes in species composition and how the shell structures dissolve. Sediment samples were selected from different regions of the Southern Ocean, e.g. Weddel Sea, Scotia Sea, Polar Front Zone.The information about BSi dissolution kinetics will be considered in a regional context. For this purpose detailed information of diatom assemblages and clay mineralogy are considered. The combination of results from laboratory measurements and regional distribution of parameters affecting the benthic silica cycle helps us decipher processes regulating the BSi burial and provides a more detailed understanding of the dissolution of BSi in surface sediments within certain regions of the Southern Ocean. Conference Object Scotia Sea Southern Ocean Weddel Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Scotia Sea Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Biogenic silica (BSi) is a major component in marine geochemical cycles and a suitable proxy for paleoproductivity. The Southern Ocean plays a key role in the biogeochemical cycle of silicon. For questions of opal preservation and to assess the global biogenic silica cycle it is important to understand the processes controlling BSi dissolution.The results from fitting the leaching curves, derived by wet-alkaline-extraction of biogenic silica, gives an estimate of the reactivity of biogenic silica in sediments. To get detailed information on kinetics and solubility of biogenic silica, continuously stirred flow-through experiments were performed. Use of flow through reactors allow quantification of dissolution rates and saturation concentrations under well defined conditions. Dissolution rates of sediment samples in stirred flow-through reactors were measured as a function of the degree of undersaturation by varying the silica acid concentrations or the flow rate of the inflow solution. By taking samples out of the reactors during the experiments we also get information about changes in species composition and how the shell structures dissolve. Sediment samples were selected from different regions of the Southern Ocean, e.g. Weddel Sea, Scotia Sea, Polar Front Zone.The information about BSi dissolution kinetics will be considered in a regional context. For this purpose detailed information of diatom assemblages and clay mineralogy are considered. The combination of results from laboratory measurements and regional distribution of parameters affecting the benthic silica cycle helps us decipher processes regulating the BSi burial and provides a more detailed understanding of the dissolution of BSi in surface sediments within certain regions of the Southern Ocean. |
format |
Conference Object |
author |
Seeberg-Elverfeldt, J. Schlüter, Michael Schäfer, Angela |
spellingShingle |
Seeberg-Elverfeldt, J. Schlüter, Michael Schäfer, Angela Dissolution of biogenic silica in Southern Ocean surface sediments |
author_facet |
Seeberg-Elverfeldt, J. Schlüter, Michael Schäfer, Angela |
author_sort |
Seeberg-Elverfeldt, J. |
title |
Dissolution of biogenic silica in Southern Ocean surface sediments |
title_short |
Dissolution of biogenic silica in Southern Ocean surface sediments |
title_full |
Dissolution of biogenic silica in Southern Ocean surface sediments |
title_fullStr |
Dissolution of biogenic silica in Southern Ocean surface sediments |
title_full_unstemmed |
Dissolution of biogenic silica in Southern Ocean surface sediments |
title_sort |
dissolution of biogenic silica in southern ocean surface sediments |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/10956/ https://epic.awi.de/id/eprint/10956/1/See2004a.pdf https://hdl.handle.net/10013/epic.21421 https://hdl.handle.net/10013/epic.21421.d001 |
geographic |
Scotia Sea Southern Ocean |
geographic_facet |
Scotia Sea Southern Ocean |
genre |
Scotia Sea Southern Ocean Weddel Sea |
genre_facet |
Scotia Sea Southern Ocean Weddel Sea |
op_source |
EPIC3XXVIII SCAR Open Science Conference, 26-28 July, Bremen, Germany. |
op_relation |
https://epic.awi.de/id/eprint/10956/1/See2004a.pdf https://hdl.handle.net/10013/epic.21421.d001 Seeberg-Elverfeldt, J. , Schlüter, M. orcid:0000-0002-4997-3802 and Schäfer, A. orcid:0000-0003-1784-2979 (2004) Dissolution of biogenic silica in Southern Ocean surface sediments , XXVIII SCAR Open Science Conference, 26-28 July, Bremen, Germany. . hdl:10013/epic.21421 |
_version_ |
1776203550359027712 |