What is it about?
We use climate model simulations to study astronomically-paced climate cycles in the warm greenhouse climate of the supercontinent Pangea from 230 to 190 million years ago. With this, we identify drivers of climatic changes recorded in lake sediments of the Newark–Hartford Basins of the eastern United States. We show how the combination of astronomical forcing and the plate tectonic drift as well as fluctuating atmospheric pCO2 could have caused the reconstructed cycles and trends.
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Why is it important?
The glacial cycles of the last 3 My demonstrate the fundamental control of astronomical variations on Earth’s climate system. Our work helps to understand how this important mechanism caused global climate change in the ancient past, but also in possible future warm climate states.
Read the Original
This page is a summary of: Modes of Pangean lake level cyclicity driven by astronomical climate pacing modulated by continental position and
CO2, Proceedings of the National Academy of Sciences, November 2022, Proceedings of the National Academy of Sciences, DOI: 10.1073/pnas.2203818119.
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Data from Climate Model Simulations for Triassic-Jurassic Orbital Climate Cycles
In "Modes of Pangean lake level cyclicity driven by astronomicalclimate pacing modulated by continental position and pCO2" we study the effect of cyclic orbital parameter changes on Late Triassic to Early Jurassic paleoclimates. For this, in total 36 transient climate simulations are performed with reconstructed paleogeographies for 9 time slices in 5 Myr steps (230 to 190 million years ago) at 3 different atmospheric pCO2 values, each driven by a simplified orbital forcing over a 250,000 yr period. The data presented here is the model output on which the results of the main article are based. (The majority of further output data is not included due to its large size, but it can be made available upon request.) Also included are different model configuration files and the scripts to generate the included figures (using the Python programming language in a Jupyter Notebook). The model output data is provided in different NetCDF files, see README for detailed description.
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