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Uranium, Thorium and Protactinium isotopes of ODP Site 172-1063, supplementary data to: Lippold, Jörg; Gruetzner, Jens; Winter, Diane M; Lahaye, Yann; Mangini, Augusto; Christl, Marcus (2009): Does sedimentary 231Pa/230Th from the Bermuda Rise monitor past Atlantic Meridional Overtuning Circulation?. Geophysical Research Letters, 36, L12601

Ocean circulation may have undergone reductions and reinvigorations in the past closely tied to regional climate changes. Measurements of 231Pa/230Th ratios in a sediment core from the Bermuda Rise have been interpreted as evidence that the Atlantic Meridional Overturning Circulation (AMOC) was weak...

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Bibliographic Details
Main Authors: Lippold, Jörg (Author) , Gruetzner, Jens (Author) , Winter, Diane M (Author)
Other Authors: Lahaye, Yann (Other) , Mangini, Augusto (Other) , Christl, Marcus (Other)
Format: Book/Monograph Research Data
Language:English
Published: Bremen/Bremerhaven PANGAEA - Data Publisher for Earth & Environmental Science 2009-07-18
DOI:10.1594/PANGAEA.763199
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Online Access:Resolving-System, Volltext: http://dx.doi.org/10.1594/PANGAEA.763199
Resolving-System, Volltext: http://nbn-resolving.de/urn:nbn:de:tib-10.1594/PANGAEA.7631990
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Summary:Ocean circulation may have undergone reductions and reinvigorations in the past closely tied to regional climate changes. Measurements of 231Pa/230Th ratios in a sediment core from the Bermuda Rise have been interpreted as evidence that the Atlantic Meridional Overturning Circulation (AMOC) was weakened or completely eliminated during a period of catastrophic iceberg discharges (Heinrich-Event 1, H1). Here we present new data from the Bermuda Rise that show further 231Pa/230Th peaks during Heinrich-2 (H2) and Heinrich-3 (H3). Additionally, a tight correlation between diatom abundances (biogenic silica) and 231Pa/230Th is discovered in this core. Our results redirect the interpretation of 231Pa/230Th from the Bermuda Rise as a proxy for ocean circulation towards a proxy that reacts highly sensitive to changes of particle composition and water mass properties.
Item Description:This dataset is supplement to doi:10.1029/2009GL038068
Physical Description:Online Resource
DOI:10.1594/PANGAEA.763199

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