Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates
International audience The processes controlling preservation and recycling of particulate biogenic silica in sediments must be understood in order to calculate oceanic silica mass balances. The new contribution of this work is the coupled use of advanced models including reprecipitation and differe...
Published in: | Marine Chemistry |
---|---|
Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
|
Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-00635620 https://doi.org/10.1016/j.marchem.2006.12.004 |
id |
ftceafr:oai:HAL:hal-00635620v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
Silica cycle Early diagenesis Biogenic silica dissolution Reprecipitation North Atlantic Equatorial Pacific Southern Ocean [SDE]Environmental Sciences |
spellingShingle |
Silica cycle Early diagenesis Biogenic silica dissolution Reprecipitation North Atlantic Equatorial Pacific Southern Ocean [SDE]Environmental Sciences Khalil, K. Rabouille, C. Gallinari, Morgane Soetaert, K. Demaster, D., J. Ragueneau, Olivier Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates |
topic_facet |
Silica cycle Early diagenesis Biogenic silica dissolution Reprecipitation North Atlantic Equatorial Pacific Southern Ocean [SDE]Environmental Sciences |
description |
International audience The processes controlling preservation and recycling of particulate biogenic silica in sediments must be understood in order to calculate oceanic silica mass balances. The new contribution of this work is the coupled use of advanced models including reprecipitation and different phases of biogenic silica with different dissolution characteristics as well as new data sets concerning experimental dissolution rates of marine particles and sediment opal obtained in flow-through reactors. We have used three models representing early diagenesis of biogenic silica in sediments that calculate the vertical distributions of dissolved silicate and solid silica in sediments. Model 1 contains one type of biogenic silica and the dissolution rate is constant, whereas model 2 contains a variable dissolution rate constant with sediment depth (representing aging) and one type of biogenic silica. Model 3 incorporates aging by describing two types of biogenic silica that differ by their dissolution properties. An explicit term of reprecipitation is incorporated into the three models. The distributions of dissolved silicate and solid silica predicted by steady-state calculations are compared to 4 observed data sets, from the Southern Ocean, the Equatorial Pacific and the North Atlantic, covering a wide range of sediment compositions, from opal-rich to opal-poor sediments. After adjustment of the critical parameters (the apparent silica dissolution rate constants, the biogenic silica flux deposited at the sediment-water interface and the reprecipitation rate), the second and third models provide good agreements between predicted and measured dissolved Si and solid silica profiles for each data set, except for the second model in the Equatorial Pacific. However, a large discrepancy between the experimentally derived dissolution rate constants and those calculated by the models is observed at all sites at depth in the sediment, suggesting that either artifacts arise during dissolution experiments such as ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Océan et Interfaces (OCEANIS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Netherlands Institute of Ecology (NIOO-KNAW) Department of MEAS North Carolina State University Raleigh (NC State) University of North Carolina System (UNC)-University of North Carolina System (UNC) |
format |
Article in Journal/Newspaper |
author |
Khalil, K. Rabouille, C. Gallinari, Morgane Soetaert, K. Demaster, D., J. Ragueneau, Olivier |
author_facet |
Khalil, K. Rabouille, C. Gallinari, Morgane Soetaert, K. Demaster, D., J. Ragueneau, Olivier |
author_sort |
Khalil, K. |
title |
Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates |
title_short |
Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates |
title_full |
Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates |
title_fullStr |
Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates |
title_full_unstemmed |
Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates |
title_sort |
constraining biogenic silica dissolution in marine sediments: a comparison between diagenetic models and experimental dissolution rates |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.univ-brest.fr/hal-00635620 https://doi.org/10.1016/j.marchem.2006.12.004 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00635620 Marine Chemistry, 2007, 106 (1-2), pp.223-238. ⟨10.1016/j.marchem.2006.12.004⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2006.12.004 hal-00635620 https://hal.univ-brest.fr/hal-00635620 doi:10.1016/j.marchem.2006.12.004 |
op_doi |
https://doi.org/10.1016/j.marchem.2006.12.004 |
container_title |
Marine Chemistry |
container_volume |
106 |
container_issue |
1-2 |
container_start_page |
223 |
op_container_end_page |
238 |
_version_ |
1812179280647421952 |
spelling |
ftceafr:oai:HAL:hal-00635620v1 2024-10-06T13:51:06+00:00 Constraining biogenic silica dissolution in marine sediments: A comparison between diagenetic models and experimental dissolution rates Khalil, K. Rabouille, C. Gallinari, Morgane Soetaert, K. Demaster, D., J. Ragueneau, Olivier Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Océan et Interfaces (OCEANIS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Netherlands Institute of Ecology (NIOO-KNAW) Department of MEAS North Carolina State University Raleigh (NC State) University of North Carolina System (UNC)-University of North Carolina System (UNC) 2007-07-10 https://hal.univ-brest.fr/hal-00635620 https://doi.org/10.1016/j.marchem.2006.12.004 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.marchem.2006.12.004 hal-00635620 https://hal.univ-brest.fr/hal-00635620 doi:10.1016/j.marchem.2006.12.004 ISSN: 0304-4203 Marine Chemistry https://hal.univ-brest.fr/hal-00635620 Marine Chemistry, 2007, 106 (1-2), pp.223-238. ⟨10.1016/j.marchem.2006.12.004⟩ Silica cycle Early diagenesis Biogenic silica dissolution Reprecipitation North Atlantic Equatorial Pacific Southern Ocean [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2007 ftceafr https://doi.org/10.1016/j.marchem.2006.12.004 2024-09-10T01:29:14Z International audience The processes controlling preservation and recycling of particulate biogenic silica in sediments must be understood in order to calculate oceanic silica mass balances. The new contribution of this work is the coupled use of advanced models including reprecipitation and different phases of biogenic silica with different dissolution characteristics as well as new data sets concerning experimental dissolution rates of marine particles and sediment opal obtained in flow-through reactors. We have used three models representing early diagenesis of biogenic silica in sediments that calculate the vertical distributions of dissolved silicate and solid silica in sediments. Model 1 contains one type of biogenic silica and the dissolution rate is constant, whereas model 2 contains a variable dissolution rate constant with sediment depth (representing aging) and one type of biogenic silica. Model 3 incorporates aging by describing two types of biogenic silica that differ by their dissolution properties. An explicit term of reprecipitation is incorporated into the three models. The distributions of dissolved silicate and solid silica predicted by steady-state calculations are compared to 4 observed data sets, from the Southern Ocean, the Equatorial Pacific and the North Atlantic, covering a wide range of sediment compositions, from opal-rich to opal-poor sediments. After adjustment of the critical parameters (the apparent silica dissolution rate constants, the biogenic silica flux deposited at the sediment-water interface and the reprecipitation rate), the second and third models provide good agreements between predicted and measured dissolved Si and solid silica profiles for each data set, except for the second model in the Equatorial Pacific. However, a large discrepancy between the experimentally derived dissolution rate constants and those calculated by the models is observed at all sites at depth in the sediment, suggesting that either artifacts arise during dissolution experiments such as ... Article in Journal/Newspaper North Atlantic Southern Ocean HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Pacific Southern Ocean Marine Chemistry 106 1-2 223 238 |