edu.ucar.opensky::articles:25423 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T22:44:37.043887 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7n01b7p https://doi.org/10.5281/zenodo.6472914 https Related Dataset #1 Paleobotanical precipitation estimates used in Williams et al.: African hydroclimate monsoon during the early Eocene from the DeepMIP simulations, Paleoceanography and Paleoclimatology, 2022 African hydroclimate during the early Eocene from the DeepMIP simulations 2022-05-01T00:00:00Z publication https://n2t.org/ark:/85065/d7n01b7p https://doi.org/10.1029/2022PA004419 Williams, C. J. author Lunt, D. J. author Salzmann, U. author Reichgelt, T. author Inglis, G. N. author Greenwood, D. R. author Chan, W. author Abe-Ouchi, A. author Donnadieu, Y. author Hutchinson, D. K. author Boer, A. M. author Ladant, J. author Morozova, P. A. author Niezgodzki, I. author Knorr, G. author Steinig, S. author Zhang, Z. author Zhu, Jiang author Huber, M. author Otto-Bliesner, Bette author UCAR/NCAR - Library publisher The early Eocene (similar to 56-48 Myr ago) is characterized by high CO2 estimates (1,200-2,500 ppmv) and elevated global temperatures (similar to 10 degrees C-16 degrees C higher than modern). However, the response of the hydrological cycle during the early Eocene is poorly constrained, especially in regions with sparse data coverage (e.g., Africa). Here, we present a study of African hydroclimate during the early Eocene, as simulated by an ensemble of state-of-the-art climate models in the Deep-time Model Intercomparison Project (DeepMIP). A comparison between the DeepMIP pre-industrial simulations and modern observations suggests that model biases are model- and geographically dependent, however, these biases are reduced in the model ensemble mean. A comparison between the Eocene simulations and the pre-industrial suggests that there is no obvious wetting or drying trend as the CO2 increases. The results suggest that changes to the land sea mask (relative to modern) in the models may be responsible for the simulated increases in precipitation to the north of Eocene Africa. There is an increase in precipitation over equatorial and West Africa and associated drying over northern Africa as CO2 rises. There are also important dynamical changes, with evidence that anticyclonic low-level circulation is replaced by increased south-westerly flow at high CO2 levels. Lastly, a model-data comparison using newly compiled quantitative climate estimates from paleobotanical proxy data suggests a marginally better fit with the reconstructions at lower levels of CO2. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation