HS1 records bases on isotope, inorganic and organic geochemistry of sediment cores GeoB16224-1 and GeoB16212-2 ...

The temporal succession of changes in Amazonian hydroclimate during Heinrich Stadial 1 (HS1) (ca. 18-14.7 cal ka BP) is currently poorly resolved. Here we present HS1 records based on isotope, inorganic and organic geochemistry from a marine sediment core influenced by the Amazon River discharge. Ou...

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Bibliographic Details
Main Authors: Crivellari, Stefano, Chiessi, Cristiano Mazur, Kuhnert, Henning, Häggi, Christoph, Portilho-Ramos, Rodrigo Costa, Zeng, Jing-Ying, Zhang, Yancheng, Schefuß, Enno, Mollenhauer, Gesine, Hefter, Jens, Alexandre, Felipe, Mulitza, Stefan, Sampaio, Gilvan
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2018
Subjects:
Center for Marine Environmental Sciences MARUM
Ramos
Planktonic foraminifera
Online Access:https://dx.doi.org/10.1594/pangaea.887797
https://doi.pangaea.de/10.1594/PANGAEA.887797
Description
Summary:The temporal succession of changes in Amazonian hydroclimate during Heinrich Stadial 1 (HS1) (ca. 18-14.7 cal ka BP) is currently poorly resolved. Here we present HS1 records based on isotope, inorganic and organic geochemistry from a marine sediment core influenced by the Amazon River discharge. Our records offer a detailed reconstruction of the changes in Amazonian hydroclimate during HS1, integrated over the basin. We reconstructed surface water hydrography using stable oxygen isotopes (d18O) and Mg/Ca-derived paleotemperatures from the planktonic foraminifera Globigerinoides ruber, as well as salinity changes based on stable hydrogen isotope (dD) of palmitic acid. We also analyzed branched and isoprenoid tetraether concentrations, and compared them to existing bulk sediment ln(Fe/Ca) data and vegetation reconstruction based on stable carbon isotopes from n-alkanes, in order to understand the relationship between continental precipitation, vegetation and sediment production. Our results indicate a ... : Supplement to: Crivellari, Stefano; Chiessi, Cristiano Mazur; Kuhnert, Henning; Häggi, Christoph; Portilho-Ramos, Rodrigo Costa; Zeng, Jing-Ying; Zhang, Yancheng; Schefuß, Enno; Mollenhauer, Gesine; Hefter, Jens; Alexandre, Felipe; Mulitza, Stefan; Sampaio, Gilvan (2018): Increased Amazon freshwater discharge during late Heinrich Stadial 1. Quaternary Science Reviews, 181, 144-155 ...

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