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 d30Si, was generally much lower during glacial times than today. There is consensus that this v...
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ftleibnizopen:oai:oai.leibnizopen.de:6EGVhIgBdbrxVwz66CIi 2023-06-18T03:43:11+02:00 Silicon Isotopes in an EMIC's Ocean: Sensitivity to Runoff, Iron Supply, and Climate Dietze, H. Löptien, U. Hordoir, R. Heinemann, M. Huiskamp, W. Schneider, B. 2020 application/pdf https://oa.tib.eu/renate/handle/123456789/7586 https://doi.org/10.34657/6633 eng eng Hoboken, NJ : Wiley CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ Paleoceanography and paleoclimatology 35 (2020), Nr. 10 biogeochemical modeling Earth System Model Last Glacial Maximum ocean sediment silicon isotopes 550 article Text 2020 ftleibnizopen https://doi.org/10.34657/6633 2023-06-04T23:15:02Z 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 d30Si, 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 d30Si 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. © 2020. The Authors. publishedVersion Article in Journal/Newspaper Southern Ocean LeibnizOpen (The Leibniz Association) Southern Ocean |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
biogeochemical modeling Earth System Model Last Glacial Maximum ocean sediment silicon isotopes 550 |
spellingShingle |
biogeochemical modeling Earth System Model Last Glacial Maximum ocean sediment silicon isotopes 550 Dietze, H. Löptien, U. Hordoir, R. Heinemann, M. Huiskamp, W. Schneider, B. Silicon Isotopes in an EMIC's Ocean: Sensitivity to Runoff, Iron Supply, and Climate |
topic_facet |
biogeochemical modeling Earth System Model Last Glacial Maximum ocean sediment silicon isotopes 550 |
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 d30Si, 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 d30Si 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. © 2020. The Authors. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Dietze, H. Löptien, U. Hordoir, R. Heinemann, M. Huiskamp, W. Schneider, B. |
author_facet |
Dietze, H. Löptien, U. Hordoir, R. Heinemann, M. Huiskamp, W. Schneider, B. |
author_sort |
Dietze, H. |
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 |
publisher |
Hoboken, NJ : Wiley |
publishDate |
2020 |
url |
https://oa.tib.eu/renate/handle/123456789/7586 https://doi.org/10.34657/6633 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Paleoceanography and paleoclimatology 35 (2020), Nr. 10 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/6633 |
_version_ |
1769009480226308096 |