Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution
Sediment redistribution at the seafloor is a widespread process in marine environments. In the last years, increasing evidence has been found that sedimentary budgets for biogenic silica and other components may be strongly biased by sediment focusing. The natural radioisotope Thorium-230 provides a...
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ftawi:oai:epic.awi.de:12804 2023-09-05T13:23:29+02:00 Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution Geibert, W. Rutgers v. d. Loeff, Michiel Usbeck, Regina Gersonde, Rainer Kuhn, Gerhard Seeberg-Elverfeldt, J. 2005 https://epic.awi.de/id/eprint/12804/ https://hdl.handle.net/10013/epic.23214 unknown Geibert, W. orcid:0000-0001-8646-2334 , Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Usbeck, R. , Gersonde, R. , Kuhn, G. orcid:0000-0001-6069-7485 and Seeberg-Elverfeldt, J. (2005) Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution , EGU General Assembly, 25-29 Apr., Vienna, Austria. . hdl:10013/epic.23214 EPIC3EGU General Assembly, 25-29 Apr., Vienna, Austria. Conference notRev 2005 ftawi 2023-08-22T19:50:10Z Sediment redistribution at the seafloor is a widespread process in marine environments. In the last years, increasing evidence has been found that sedimentary budgets for biogenic silica and other components may be strongly biased by sediment focusing. The natural radioisotope Thorium-230 provides a method for correcting fluxes into the sediment for this lateral transport. The 230Th-normalization method has so far been applied to individual sediment cores and some longitudinal sectionsonly, giving a first impression of the strong influence of sediment redistribution. However, the database of 230Th-corrected data had been too scarce to calculate reliable spatial budgets for whole ocean basins. Here we present a comprehensive set (114 samples) of 230Th-corrected biogenic silica accumulation rate data for surface sediments in the South Atlantic and adjoining areas. The focusing-corrected budgets for silica are considerably lower than earlier estimates.The focusing-corrected accumulation rates, representing vertical fluxes intothe sediment, will facilitate the comparison of core data to model results. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) 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 |
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description |
Sediment redistribution at the seafloor is a widespread process in marine environments. In the last years, increasing evidence has been found that sedimentary budgets for biogenic silica and other components may be strongly biased by sediment focusing. The natural radioisotope Thorium-230 provides a method for correcting fluxes into the sediment for this lateral transport. The 230Th-normalization method has so far been applied to individual sediment cores and some longitudinal sectionsonly, giving a first impression of the strong influence of sediment redistribution. However, the database of 230Th-corrected data had been too scarce to calculate reliable spatial budgets for whole ocean basins. Here we present a comprehensive set (114 samples) of 230Th-corrected biogenic silica accumulation rate data for surface sediments in the South Atlantic and adjoining areas. The focusing-corrected budgets for silica are considerably lower than earlier estimates.The focusing-corrected accumulation rates, representing vertical fluxes intothe sediment, will facilitate the comparison of core data to model results. |
format |
Conference Object |
author |
Geibert, W. Rutgers v. d. Loeff, Michiel Usbeck, Regina Gersonde, Rainer Kuhn, Gerhard Seeberg-Elverfeldt, J. |
spellingShingle |
Geibert, W. Rutgers v. d. Loeff, Michiel Usbeck, Regina Gersonde, Rainer Kuhn, Gerhard Seeberg-Elverfeldt, J. Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution |
author_facet |
Geibert, W. Rutgers v. d. Loeff, Michiel Usbeck, Regina Gersonde, Rainer Kuhn, Gerhard Seeberg-Elverfeldt, J. |
author_sort |
Geibert, W. |
title |
Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution |
title_short |
Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution |
title_full |
Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution |
title_fullStr |
Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution |
title_full_unstemmed |
Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution |
title_sort |
biogenic silica accumulation rates in surface sediments of the southern ocean corrected for sediment redistribution |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/12804/ https://hdl.handle.net/10013/epic.23214 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3EGU General Assembly, 25-29 Apr., Vienna, Austria. |
op_relation |
Geibert, W. orcid:0000-0001-8646-2334 , Rutgers v. d. Loeff, M. orcid:0000-0003-1393-3742 , Usbeck, R. , Gersonde, R. , Kuhn, G. orcid:0000-0001-6069-7485 and Seeberg-Elverfeldt, J. (2005) Biogenic silica accumulation rates in surface sediments of the Southern Ocean corrected for sediment redistribution , EGU General Assembly, 25-29 Apr., Vienna, Austria. . hdl:10013/epic.23214 |
_version_ |
1776204079742058496 |