- 1Organic Geochemistry Unit, School of Chemistry, School of Earth Sciences, Cabot Institute for the Environment, University of Bristol, UK
- 2State Key Laboratory of Geomicrobiology and Environmental Changes, China Univeristy of Geosciences, Wuhan, China
- 3Department of Physics and Earth Sciences, University of Ferrara, Ferrara, Italy
- 4School of Geographical Sciences, University of Bristol, Bristol, UK
- 5Institute of Geosciences and Georesources, C.N.R., Padova, Italy
- 6Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan, China
- 7School of Earth Sciences, University of Bristol, Bristol, UK
The Carnian Pluvial Episode was marked by episodic climate perturbations and multiple negative carbon isotope excursions (NCIEs) in (in)organic carbon. Its onset (NCIE-1) corresponds to an extended period of climate disruption, including global warming and an intensified hydrological cycle, as evidenced by increased siliciclastic inputs into marine basins and hygrophytic palynological assemblages. To investigate climatic/biotic changes of NCIE-1, we analyzed plant, algal, and bacterial lipid biomarkers and δ2H of leaf-wax n-alkanes from the Dolomites (Italy) in northwestern Tethys. Coeval δ2H reductions in n-alkanes by up to ca. 40‰ align with NCIE-1, indicating increased rainfall and altered hydroclimate in this initial carbon cycle perturbation. Concurrently, elevated biomarker concentrations reveal enhanced terrestrial inputs and marine primary production, with shifts in land plant communities via n-alkane distributions and alterations in marine algal communities by sterane assemblages. The biomarker dataset emphasizes the immediate impact of the NCIE-1 on both the terrestrial and marine ecosystems. Such a hydroclimate-biotic change in Dolomites suggests a complicated interaction amongst carbon and hydrological cycle via atmospheric-ocean dynamics during Carnian urgent to be investigated.
How to cite: Huang, Y., Dal Corso, J., Gianolla, P., Lunt, D., Farnsworth, A., Roghi, G., Wang, Y., Naafs, D., Dang, X., Benton, M., and Pancost, R.: Hydroclimatic change at the immediate start of the Carnian Pluvial Episode (Late Triassic), EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-4630, https://doi.org/10.5194/egusphere-egu25-4630, 2025.
