- 1Potsdam Institute for Climate Impact Research (PIK), RD1, Potsdam, Germany (rostami@pik-potsdam.de)
- 2Laboratoire de Météorologie Dynamique (LMD) / IPSL, ENS-PSL Université, Ecole Polytechnique-Institut Polytechnique de Paris, Sorbonne Université, CNRS, Paris, France
- 3Deutsches Klimarechenzentrum GmbH (DKRZ), Germany
- 4University of KwaZulu-Natal, South Africa
This study introduces Aeolus 2.0[1, 2], a novel multilayer moist-convective Thermal Rotating Shallow Water (mcTRSW) model designed to simulate atmospheric dynamics under various forcings, such as increased radiative or thermal forcing, as well as the effects of latent heat release and radiative transfer on meso- and large-scale dynamics. The model incorporates a novel moist-convective scheme that respects conservation laws, a new bulk aerodynamic scheme for sea surface evaporation and sensible heat flux, and provides a computationally efficient yet physically robust framework, bridging the gap between idealized models and complex general circulation models. Aeolus 2.0 integrates barotropic and baroclinic processes, enabling detailed investigations of phenomena such as zonal wind variability, heatwaves, and seasonal energy fluxes.
The model has already been applied to various atmospheric phenomena, such as simulating the Madden-Julian Oscillation (MJO)[3], large-scale localized extreme heatwaves[4], and atmospheric responses to increased radiative forcing during solstices and equinoxes[1]. In this presentation, we showcase the results of the latter. The findings highlight significant changes in zonal wind velocity and meridional temperature gradients, with notable hemispheric asymmetry. Specifically, increased radiative forcing enhances subtropical westerly jet velocities and mid-latitude temperatures during the solstices, while reducing polar cyclone zonal wind velocities in the affected hemisphere. Poleward eddy heat fluxes were consistently observed across hemispheres, and heatwave intensity and duration were amplified over both land and ocean regions.
References:
[1] Rostami, M., Petri, S., Fallah, B., Fazel-Rastgar, F. (2025). Aeolus 2.0's thermal rotating shallow water model: A new paradigm for simulating extreme heatwaves, westerly jet intensification, and more. Physics of Fluids, 37 (1), 016604. https://doi.org/10.1063/5.0244908.
[2] Rostami, M., Petri, S., Guimaräes, S.O., Fallah, B. (2024). Open-source stand-alone version of atmosphere model Aeolus 2.0 Software. Geoscience Data Journal, 11, 1086–1093. https://doi.org/10.1002/gdj3.249. (Link to Zenodo: https://doi.org/10.5281/zenodo.10054154)
[3] Rostami, M., Zhao, B. & Petri, S. (2022). On the genesis and dynamics of madden–Julian oscillation-like structure formed by equatorial adjustment of localized heating. Quarterly Journal of the Royal Meteorological Society, 148, 3788–3813. https://doi.org/10.1002/qj.4388.
[4] Rostami, M., Severino, L., Petri, S., & Hariri, S. (2023). Dynamics of localized extreme heatwaves in the mid-latitude atmosphere: A conceptual examination. Atmospheric Science Letters, e1188. https://doi.org/10.1002/asl.1188 .
How to cite: Rostami, M., Petri, S., Fallah, B., and Fazel-Rastgar, F.: On the Dynamical Core of Aeolus 2.0: An Atmospheric Model Using a Moist-Convective Thermal Rotating Shallow Water Framework, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-5038, https://doi.org/10.5194/egusphere-egu25-5038, 2025.