• Medientyp: E-Artikel
  • Titel: Impact of global cooling on Early Cretaceous high pCO2 world during the Weissert Event
  • Beteiligte: Cavalheiro, Liyenne [Verfasser:in]; Wagner, Thomas [Verfasser:in]; Steinig, Sebastian [Verfasser:in]; Bottini, Cinzia [Verfasser:in]; Dummann, Wolf [Verfasser:in]; Esegbue, Onoriode [Verfasser:in]; Gambacorta, Gabriele [Verfasser:in]; Giraldo-Gómez, Victor [Verfasser:in]; Farnsworth, Alexander [Verfasser:in]; Flögel, Sascha [Verfasser:in]; Hofmann, Peter [Verfasser:in]; Lunt, Daniel J. [Verfasser:in]; Rethemeyer, Janet [Verfasser:in]; Torricelli, Stefano [Verfasser:in]; Erba, Elisabetta [Verfasser:in]
  • Erschienen: Nature Research, 2021-09-13
  • Sprache: Englisch
  • DOI: https://doi.org/10.1038/s41467-021-25706-0
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  • Beschreibung: The Weissert Event ~133 million years ago marked a profound global cooling that punctuated the Early Cretaceous greenhouse. We present modelling, high-resolution bulk organic carbon isotopes and chronostratigraphically calibrated sea surface temperature (SSTs) based on an organic paleothermometer (the TEX86 proxy), which capture the Weissert Event in the semi-enclosed Weddell Sea basin, offshore Antarctica (paleolatitude ~54 °S; paleowater depth ~500 meters). We document a ~3–4 °C drop in SST coinciding with the Weissert cold end, and converge the Weddell Sea data, climate simulations and available worldwide multi-proxy based temperature data towards one unifying solution providing a best-fit between all lines of evidence. The outcome confirms a 3.0 °C ( ±1.7 °C) global mean surface cooling across the Weissert Event, which translates into a ~40% drop in atmospheric pCO2 over a period of ~700 thousand years. Consistent with geologic evidence, this pCO2 drop favoured the potential build-up of local polar ice.
  • Zugangsstatus: Freier Zugang