Biogenic Silica Dissolution In Southern Ocean Sediments
Biogenic silica (BSi) is a major component in marine geochemical cycles and asuitable proxy for paleoproductivity. The Southern Ocean plays a key role in thebiochemical cycle of silicon. For questions of opal preservation and to assess theglobal biogenic silica cycle it is important to understand th...
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ftawi:oai:epic.awi.de:8564 2023-09-05T13:22:59+02:00 Biogenic Silica Dissolution In Southern Ocean Sediments Berger, J. Schlüter, Michael Schäfer, Angela 2003 application/pdf https://epic.awi.de/id/eprint/8564/ https://epic.awi.de/id/eprint/8564/1/Ber2003b.pdf https://hdl.handle.net/10013/epic.19090 https://hdl.handle.net/10013/epic.19090.d001 unknown https://epic.awi.de/id/eprint/8564/1/Ber2003b.pdf https://hdl.handle.net/10013/epic.19090.d001 Berger, J. , Schlüter, M. orcid:0000-0002-4997-3802 and Schäfer, A. orcid:0000-0003-1784-2979 (2003) Biogenic Silica Dissolution In Southern Ocean Sediments , EGS-AGU-EUG Joint Assembly, 6-11 April, Nice, France. . hdl:10013/epic.19090 EPIC3EGS-AGU-EUG Joint Assembly, 6-11 April, Nice, France. Conference notRev 2003 ftawi 2023-08-22T19:47:29Z Biogenic silica (BSi) is a major component in marine geochemical cycles and asuitable proxy for paleoproductivity. The Southern Ocean plays a key role in thebiochemical cycle of silicon. For questions of opal preservation and to assess theglobal biogenic silica cycle it is important to understand the processes controling BSidissolution.Continuously stirred flow-through experiments were used to determine the kineticsand solubility of biogenic silica. Use of flow through reactors allow quantificationof dissolution rates and saturation concentrations under well defined conditions.Dissolution rates of sediment samples in stirred flow-through reactors were measuredas a function of the degree of undersaturation by varying the silica acid concentrationsor the flow rate of the inflow solution. Sediment samples were selected from differentregions of the Southern Ocean, e.g. Weddel Sea, Scotia Sea, Polar Front Zone.New and published information about BSi dissolution kinetics will be considered ina regional context. For this purpose detailed information of diatom assemblages andclay mineralogy are considered. Furthermore an up to date compilation of diffusivesilicic acid fluxes and BSi content in surface sediments is presented. The combinationof results from laboratory measurements and regional distribution of parameterseffecting the benthic silica cycle helps us to decipher processes regulating the BSiburial and provides a more detailed understanding of the dissolution of BSi in surfacesediments 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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ftawi |
language |
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description |
Biogenic silica (BSi) is a major component in marine geochemical cycles and asuitable proxy for paleoproductivity. The Southern Ocean plays a key role in thebiochemical cycle of silicon. For questions of opal preservation and to assess theglobal biogenic silica cycle it is important to understand the processes controling BSidissolution.Continuously stirred flow-through experiments were used to determine the kineticsand solubility of biogenic silica. Use of flow through reactors allow quantificationof dissolution rates and saturation concentrations under well defined conditions.Dissolution rates of sediment samples in stirred flow-through reactors were measuredas a function of the degree of undersaturation by varying the silica acid concentrationsor the flow rate of the inflow solution. Sediment samples were selected from differentregions of the Southern Ocean, e.g. Weddel Sea, Scotia Sea, Polar Front Zone.New and published information about BSi dissolution kinetics will be considered ina regional context. For this purpose detailed information of diatom assemblages andclay mineralogy are considered. Furthermore an up to date compilation of diffusivesilicic acid fluxes and BSi content in surface sediments is presented. The combinationof results from laboratory measurements and regional distribution of parameterseffecting the benthic silica cycle helps us to decipher processes regulating the BSiburial and provides a more detailed understanding of the dissolution of BSi in surfacesediments within certain regions of the Southern Ocean. |
format |
Conference Object |
author |
Berger, J. Schlüter, Michael Schäfer, Angela |
spellingShingle |
Berger, J. Schlüter, Michael Schäfer, Angela Biogenic Silica Dissolution In Southern Ocean Sediments |
author_facet |
Berger, J. Schlüter, Michael Schäfer, Angela |
author_sort |
Berger, J. |
title |
Biogenic Silica Dissolution In Southern Ocean Sediments |
title_short |
Biogenic Silica Dissolution In Southern Ocean Sediments |
title_full |
Biogenic Silica Dissolution In Southern Ocean Sediments |
title_fullStr |
Biogenic Silica Dissolution In Southern Ocean Sediments |
title_full_unstemmed |
Biogenic Silica Dissolution In Southern Ocean Sediments |
title_sort |
biogenic silica dissolution in southern ocean sediments |
publishDate |
2003 |
url |
https://epic.awi.de/id/eprint/8564/ https://epic.awi.de/id/eprint/8564/1/Ber2003b.pdf https://hdl.handle.net/10013/epic.19090 https://hdl.handle.net/10013/epic.19090.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 |
EPIC3EGS-AGU-EUG Joint Assembly, 6-11 April, Nice, France. |
op_relation |
https://epic.awi.de/id/eprint/8564/1/Ber2003b.pdf https://hdl.handle.net/10013/epic.19090.d001 Berger, J. , Schlüter, M. orcid:0000-0002-4997-3802 and Schäfer, A. orcid:0000-0003-1784-2979 (2003) Biogenic Silica Dissolution In Southern Ocean Sediments , EGS-AGU-EUG Joint Assembly, 6-11 April, Nice, France. . hdl:10013/epic.19090 |
_version_ |
1776203550045503488 |