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  Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate

Dietze, H., Löptien, U., Hordoir, R., Heinemann, M., Huiskamp, W. N., Schneider, B. (2020 online): Silicon isotopes in an EMIC's ocean: sensitivity to runoff, iron supply and climate. - Paleoceanography and Paleoclimatology, e2020PA003960.
https://doi.org/10.1029/2020PA003960

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Item Permalink: https://publications.pik-potsdam.de/pubman/item/item_24573 Version Permalink: https://publications.pik-potsdam.de/pubman/item/item_24573_3
Genre: Journal Article

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 Creators:
Dietze, H.1, Author
Löptien, U.1, Author
Hordoir, R.1, Author
Heinemann, M.1, Author
Huiskamp, Willem Nicholas2, Author              
Schneider, B.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: The isotopic composition of Si in biogenic silica (BSi), such as opal buried in the oceans' sediments, has changed over time. Paleo records 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 LGM on the isotopic composition of BSi archived in sediments in an Earth System Model of intermediate complexity. 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 triggered 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.

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Language(s): eng - English
 Dates: 2020-09-092020-09-14
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2020PA003960
MDB-ID: pending
PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: RD1 - Earth System Analysis
Research topic keyword: Oceans
Research topic keyword: Paleoclimate
Regional keyword: Global
 Degree: -

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Title: Paleoceanography and Paleoclimatology
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: - Sequence Number: e2020PA003960 Start / End Page: - Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/191023