Spatial pattern of BSi-Dissolution-Index in the Southern Ocean

Biogenic silica (BSi) is a major component in marine geochemical cycles and a suitableproxy for paleoproductivity. The Southern Ocean plays a key role in the biogeochemicalcycle of silicon. To understand opal preservation mechanisms and to assessthe global biogenic silica cycle it is important to st...

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Main Authors: Seeberg-Elverfeldt, J., Schlüter, Michael, Gersonde, Rainer, Cortese, Giuseppe, Kuhn, Gerhard, Wittling, T.
Format: Conference Object
Language:unknown
Published: 2005
Subjects:
Online Access:https://epic.awi.de/id/eprint/12153/
https://epic.awi.de/id/eprint/12153/1/See2005c.pdf
https://hdl.handle.net/10013/epic.22586
https://hdl.handle.net/10013/epic.22586.d001
id ftawi:oai:epic.awi.de:12153
record_format openpolar
spelling ftawi:oai:epic.awi.de:12153 2023-09-05T13:22:59+02:00 Spatial pattern of BSi-Dissolution-Index in the Southern Ocean Seeberg-Elverfeldt, J. Schlüter, Michael Gersonde, Rainer Cortese, Giuseppe Kuhn, Gerhard Wittling, T. 2005 application/pdf https://epic.awi.de/id/eprint/12153/ https://epic.awi.de/id/eprint/12153/1/See2005c.pdf https://hdl.handle.net/10013/epic.22586 https://hdl.handle.net/10013/epic.22586.d001 unknown https://epic.awi.de/id/eprint/12153/1/See2005c.pdf https://hdl.handle.net/10013/epic.22586.d001 Seeberg-Elverfeldt, J. , Schlüter, M. orcid:0000-0002-4997-3802 , Gersonde, R. , Cortese, G. , Kuhn, G. orcid:0000-0001-6069-7485 and Wittling, T. (2005) Spatial pattern of BSi-Dissolution-Index in the Southern Ocean , EGU General Assembly, 25-29 Apr., Vienna, Austria. . hdl:10013/epic.22586 EPIC3EGU General Assembly, 25-29 Apr., Vienna, Austria. Conference notRev 2005 ftawi 2023-08-22T19:49:44Z Biogenic silica (BSi) is a major component in marine geochemical cycles and a suitableproxy for paleoproductivity. The Southern Ocean plays a key role in the biogeochemicalcycle of silicon. To understand opal preservation mechanisms and to assessthe global biogenic silica cycle it is important to study the processes controlling BSidissolution kinetics. Common techniques for the assessment of dissolution kineticsare flow-through and batch experiments. In this study, information on BSi dissolutionkinetics will be considered in a regional context. For this purpose about 60 samplesfrom the Atlantic sector of the Southern Ocean were investigated. To identify spatialpatterns of a BSi-Dissolution-Index, the result from fitting the leaching curves, derivedby wet-alkaline-extraction of biogenic silica, gives an estimate of the reactivityof biogenic silica in sediments. To get detailed information on kinetics and solubilityof biogenic silica, continuously stirred flow-through experiments were performed.Use of flow through reactors allows quantification of dissolution rates and saturationconcentrations under well defined conditions. Dissolution rates of sediment samplesin stirred flow-through reactors were measured as a function of the degree of undersaturationby varying the silica acid concentrations or the flow rate of the inflow solution.Sediment samples were selected from different regions of the Southern Ocean, e.g.Weddel Sea, Scotia Sea, Polar Front Zone. The results of the BSi dissolution kineticsand detailed information on diatom assemblages and clay mineralogy are considered.The combination of results from laboratory measurements and regional distribution ofparameters affecting the benthic silica cycle can be used to decipher processes regulatingthe BSi burial. In addition a more detailed understanding of the dissolution of BSi in surface sediments within certain regions of the Southern Ocean can be provided. Conference Object Scotia Sea Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Scotia Sea Southern Ocean
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
description Biogenic silica (BSi) is a major component in marine geochemical cycles and a suitableproxy for paleoproductivity. The Southern Ocean plays a key role in the biogeochemicalcycle of silicon. To understand opal preservation mechanisms and to assessthe global biogenic silica cycle it is important to study the processes controlling BSidissolution kinetics. Common techniques for the assessment of dissolution kineticsare flow-through and batch experiments. In this study, information on BSi dissolutionkinetics will be considered in a regional context. For this purpose about 60 samplesfrom the Atlantic sector of the Southern Ocean were investigated. To identify spatialpatterns of a BSi-Dissolution-Index, the result from fitting the leaching curves, derivedby wet-alkaline-extraction of biogenic silica, gives an estimate of the reactivityof biogenic silica in sediments. To get detailed information on kinetics and solubilityof biogenic silica, continuously stirred flow-through experiments were performed.Use of flow through reactors allows quantification of dissolution rates and saturationconcentrations under well defined conditions. Dissolution rates of sediment samplesin stirred flow-through reactors were measured as a function of the degree of undersaturationby varying the silica acid concentrations or the flow rate of the inflow solution.Sediment samples were selected from different regions of the Southern Ocean, e.g.Weddel Sea, Scotia Sea, Polar Front Zone. The results of the BSi dissolution kineticsand detailed information on diatom assemblages and clay mineralogy are considered.The combination of results from laboratory measurements and regional distribution ofparameters affecting the benthic silica cycle can be used to decipher processes regulatingthe BSi burial. In addition a more detailed understanding of the dissolution of BSi in surface sediments within certain regions of the Southern Ocean can be provided.
format Conference Object
author Seeberg-Elverfeldt, J.
Schlüter, Michael
Gersonde, Rainer
Cortese, Giuseppe
Kuhn, Gerhard
Wittling, T.
spellingShingle Seeberg-Elverfeldt, J.
Schlüter, Michael
Gersonde, Rainer
Cortese, Giuseppe
Kuhn, Gerhard
Wittling, T.
Spatial pattern of BSi-Dissolution-Index in the Southern Ocean
author_facet Seeberg-Elverfeldt, J.
Schlüter, Michael
Gersonde, Rainer
Cortese, Giuseppe
Kuhn, Gerhard
Wittling, T.
author_sort Seeberg-Elverfeldt, J.
title Spatial pattern of BSi-Dissolution-Index in the Southern Ocean
title_short Spatial pattern of BSi-Dissolution-Index in the Southern Ocean
title_full Spatial pattern of BSi-Dissolution-Index in the Southern Ocean
title_fullStr Spatial pattern of BSi-Dissolution-Index in the Southern Ocean
title_full_unstemmed Spatial pattern of BSi-Dissolution-Index in the Southern Ocean
title_sort spatial pattern of bsi-dissolution-index in the southern ocean
publishDate 2005
url https://epic.awi.de/id/eprint/12153/
https://epic.awi.de/id/eprint/12153/1/See2005c.pdf
https://hdl.handle.net/10013/epic.22586
https://hdl.handle.net/10013/epic.22586.d001
geographic Scotia Sea
Southern Ocean
geographic_facet Scotia Sea
Southern Ocean
genre Scotia Sea
Southern Ocean
genre_facet Scotia Sea
Southern Ocean
op_source EPIC3EGU General Assembly, 25-29 Apr., Vienna, Austria.
op_relation https://epic.awi.de/id/eprint/12153/1/See2005c.pdf
https://hdl.handle.net/10013/epic.22586.d001
Seeberg-Elverfeldt, J. , Schlüter, M. orcid:0000-0002-4997-3802 , Gersonde, R. , Cortese, G. , Kuhn, G. orcid:0000-0001-6069-7485 and Wittling, T. (2005) Spatial pattern of BSi-Dissolution-Index in the Southern Ocean , EGU General Assembly, 25-29 Apr., Vienna, Austria. . hdl:10013/epic.22586
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