Bahr, André; Jaeschke, Andrea; Hou, Alicia Meng Xiao; Meier, Karl J F; Chiessi, Cristiano Mazur; Albuquerque, Ana Luiza Spadano; Friedrich, Oliver (2023): Alkenone and TEX86 data for MIS 6 to 5 on the Brazilian Margin [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.956207
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Abstract:
We generated alkenone- and TEX86- based paleotemperature estimates for MIS 6-5 in core M125-55-7 (offshore Eastern Brazil) to text whether previously generated foraminiferal Mg/Ca SST are seasonaly biased. We find that alkenone and Mg/Ca-temperatures reflect annual mean SST with a transient winter bias of alkenone SST during MIS 5a-c. The winter-bias might relate to increased upwelling activity as indicated by higher abundances of G. bulloides. TEX86 temperatures (despite showing annual mean SST in core tops) deviate by up to 6°C to lower temperatures which we attribute to increased input of terrestrial GDGT during MIS 6 as indicated by an high BIT index and (ii) migration of the TEX86 producers to deeper levels within the water column following changes in vertical particle flux efficiency.
Related to:
Bahr, André; Jaeschke, Andrea; Hou, Alicia Meng Xiao; Meier, Karl J F; Chiessi, Cristiano Mazur; Albuquerque, Ana Luiza Spadano; Rethemeyer, Janet; Friedrich, Oliver (2023): A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX 86 ‐Derived Temperatures for the Brazilian Margin. Paleoceanography and Paleoclimatology, 38(8), e2023PA004618, https://doi.org/10.1029/2023PA004618
Original version:
Hou, Alicia Meng Xiao; Bahr, André; Schmidt, Stefan; Strebl, Cornelia; Albuquerque, Ana Luiza Spadano; Chiessi, Cristiano Mazur; Friedrich, Oliver (2019): Age model of sediment cores M125-55-7/8. PANGAEA, https://doi.org/10.1594/PANGAEA.905300
References:
Hou, Alicia Meng Xiao; Bahr, André; Schmidt, Stefan; Strebl, Cornelia; Albuquerque, Ana Luiza Spadano; Chiessi, Cristiano Mazur; Friedrich, Oliver (2020): Forcing of western tropical South Atlantic sea surface temperature across three glacial-interglacial cycles. Global and Planetary Change, 188, 103150, https://doi.org/10.1016/j.gloplacha.2020.103150
Coverage:
Latitude: -20.363500 * Longitude: -38.623200
Date/Time Start: 2016-03-31T19:46:00 * Date/Time End: 2016-03-31T19:46:00
Event(s):
M125_445-7 (M125-55-7) * Latitude: -20.363500 * Longitude: -38.623200 * Date/Time: 2016-03-31T19:46:00 * Elevation: -1960.1 m * Location: South Atlantic Ocean * Campaign: M125 (SAMBA) * Basis: Meteor (1986) * Method/Device: Piston corer (PC)
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
3 datasets
Download Data
Datasets listed in this bundled publication
- Bahr, A; Jaeschke, A; Hou, AMX et al. (2023): Revised benthic isotope stratigraphy of sediment core M125-55-7. https://doi.org/10.1594/PANGAEA.956160
- Bahr, A; Jaeschke, A; Hou, AMX et al. (2023): Biomarker of sediment core M125-55-7. https://doi.org/10.1594/PANGAEA.956169
- Bahr, A; Jaeschke, A; Hou, AMX et al. (2023): Planktic foraminifera of sediment core M125-55-7. https://doi.org/10.1594/PANGAEA.956201