Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate
The isotopic composition of Si in biogenic silica (BSi), such as opal buried in the oceans' sediments, has changed over time. Paleorecords suggest that the isotopic composition, described in terms of δ30Si, was generally much lower during glacial times than today. There is consensus that this v...
Published in: | Paleoceanography and Paleoclimatology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2020PA003960 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00102-4 https://macau.uni-kiel.de/receive/macau_mods_00001008 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002059/2020PA003960.pdf |
id |
ftunivkiel:oai:macau.uni-kiel.de:macau_mods_00001008 |
---|---|
record_format |
openpolar |
spelling |
ftunivkiel:oai:macau.uni-kiel.de:macau_mods_00001008 2024-06-23T07:56:56+00:00 Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate Dietze, Heiner Löptien, Ulrike Hordoir, R. Heinemann, Malte Huiskamp, W. Schneider, Birgit 2020 https://doi.org/10.1029/2020PA003960 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00102-4 https://macau.uni-kiel.de/receive/macau_mods_00001008 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002059/2020PA003960.pdf eng eng Paleoceanography and Paleoclimatology -- 2572-4525 -- 2572-4525 https://doi.org/10.1029/2020PA003960 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00102-4 https://macau.uni-kiel.de/receive/macau_mods_00001008 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002059/2020PA003960.pdf https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess article ScholarlyArticle ddc:550 Published Version Earth System Model silicon isotopes Last Glacial Maximum biogeochemical modeling ocean sediment article Text doc-type:Article 2020 ftunivkiel https://doi.org/10.1029/2020PA003960 2024-06-12T14:19:15Z The isotopic composition of Si in biogenic silica (BSi), such as opal buried in the oceans' sediments, has changed over time. Paleorecords suggest that the isotopic composition, described in terms of δ30Si, was generally much lower during glacial times than today. There is consensus that this variability is attributable to differing environmental conditions at the respective time of BSi production and sedimentation. The detailed links between environmental conditions and the isotopic composition of BSi in the sediments remain, however, poorly constrained. In this study, we explore the effects of a suite of offset boundary conditions during the Last Glacial Maximum (LGM) on the isotopic composition of BSi archived in sediments in an Earth System Model of intermediate complexity (EMIC). Our model results suggest that a change in the isotopic composition of Si supply to the glacial ocean is sufficient to explain the observed overall low(er) glacial δ30Si in BSi. All other processes explored trigger model responses of either wrong sign or magnitude or are inconsistent with a recent estimate of bottom water oxygenation in the Atlantic Sector of the Southern Ocean. Caveats, mainly associated with generic uncertainties in today's pelagic biogeochemical modules, remain. Article in Journal/Newspaper Southern Ocean MACAU: Open Access Repository of Kiel University Southern Ocean Paleoceanography and Paleoclimatology 35 10 |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
article ScholarlyArticle ddc:550 Published Version Earth System Model silicon isotopes Last Glacial Maximum biogeochemical modeling ocean sediment |
spellingShingle |
article ScholarlyArticle ddc:550 Published Version Earth System Model silicon isotopes Last Glacial Maximum biogeochemical modeling ocean sediment Dietze, Heiner Löptien, Ulrike Hordoir, R. Heinemann, Malte Huiskamp, W. Schneider, Birgit Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate |
topic_facet |
article ScholarlyArticle ddc:550 Published Version Earth System Model silicon isotopes Last Glacial Maximum biogeochemical modeling ocean sediment |
description |
The isotopic composition of Si in biogenic silica (BSi), such as opal buried in the oceans' sediments, has changed over time. Paleorecords suggest that the isotopic composition, described in terms of δ30Si, was generally much lower during glacial times than today. There is consensus that this variability is attributable to differing environmental conditions at the respective time of BSi production and sedimentation. The detailed links between environmental conditions and the isotopic composition of BSi in the sediments remain, however, poorly constrained. In this study, we explore the effects of a suite of offset boundary conditions during the Last Glacial Maximum (LGM) on the isotopic composition of BSi archived in sediments in an Earth System Model of intermediate complexity (EMIC). Our model results suggest that a change in the isotopic composition of Si supply to the glacial ocean is sufficient to explain the observed overall low(er) glacial δ30Si in BSi. All other processes explored trigger model responses of either wrong sign or magnitude or are inconsistent with a recent estimate of bottom water oxygenation in the Atlantic Sector of the Southern Ocean. Caveats, mainly associated with generic uncertainties in today's pelagic biogeochemical modules, remain. |
format |
Article in Journal/Newspaper |
author |
Dietze, Heiner Löptien, Ulrike Hordoir, R. Heinemann, Malte Huiskamp, W. Schneider, Birgit |
author_facet |
Dietze, Heiner Löptien, Ulrike Hordoir, R. Heinemann, Malte Huiskamp, W. Schneider, Birgit |
author_sort |
Dietze, Heiner |
title |
Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate |
title_short |
Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate |
title_full |
Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate |
title_fullStr |
Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate |
title_full_unstemmed |
Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate |
title_sort |
silicon isotopes in an emic's ocean: sensitivity to runoff, iron supply and climate |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020PA003960 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00102-4 https://macau.uni-kiel.de/receive/macau_mods_00001008 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002059/2020PA003960.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Paleoceanography and Paleoclimatology -- 2572-4525 -- 2572-4525 https://doi.org/10.1029/2020PA003960 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00102-4 https://macau.uni-kiel.de/receive/macau_mods_00001008 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002059/2020PA003960.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020PA003960 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
10 |
_version_ |
1802650327153901568 |