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| Main Authors: | , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2009
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| Online Access: | https://doi.org/10.1594/PANGAEA.763199 |
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| _version_ | 1867169982913183744 |
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| author | Lippold, Jörg Gruetzner, Jens Winter, Diane M Lahaye, Yann Mangini, Augusto Christl, Marcus |
| author_facet | Lippold, Jörg Gruetzner, Jens Winter, Diane M Lahaye, Yann Mangini, Augusto Christl, Marcus |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_763199 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Uranium, Thorium and Protactinium isotopes of ODP Site 172-1063 Lippold, Jörg Gruetzner, Jens Winter, Diane M Lahaye, Yann Mangini, Augusto Christl, Marcus 172-1063B; 172-1063D; AGE; Blake-Bahama Outer Ridge, North Atlantic Ocean; Calculated; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Inductively coupled plasma - mass spectrometry (ICP-MS); Joides Resolution; Leg172; North Atlantic Ocean; Ocean Drilling Program; ODP; Protactinium-231; Protactinium-231, error, relative; Protactinium-231/Thorium-230 excess, decay-corrected; Protactinium-231/Thorium-230 excess, decay-corrected ratio, error, relative; Sample code/label; Thorium-230; Thorium-230, error, relative; Thorium-232; Thorium-232, error, relative; Uranium-234; Uranium-234, error, relative; Uranium-238; Uranium-238, error, relative 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. |
| title | Uranium, Thorium and Protactinium isotopes of ODP Site 172-1063 |
| topic | 172-1063B; 172-1063D; AGE; Blake-Bahama Outer Ridge, North Atlantic Ocean; Calculated; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Inductively coupled plasma - mass spectrometry (ICP-MS); Joides Resolution; Leg172; North Atlantic Ocean; Ocean Drilling Program; ODP; Protactinium-231; Protactinium-231, error, relative; Protactinium-231/Thorium-230 excess, decay-corrected; Protactinium-231/Thorium-230 excess, decay-corrected ratio, error, relative; Sample code/label; Thorium-230; Thorium-230, error, relative; Thorium-232; Thorium-232, error, relative; Uranium-234; Uranium-234, error, relative; Uranium-238; Uranium-238, error, relative |
| url | https://doi.org/10.1594/PANGAEA.763199 |