This session focuses on what we can learn from Earth's climate for other planetary climate regimes, and vice versa.

While often exhibiting vastly different climates, present-day Earth and other planets are fundamentally governed by the same physics. Despite this overlap, the two communities still lack a lively exchange. This session aims to bridge this gap by bringing together experts from both fields. We welcome research using, e.g., analytic theory, EBMs, 1-D radiative-convective equilibrium models, idealized GCMs, cloud-resolving models, 3-D GCMs, experiments, and observations. We particularly highlight the hierarchical nature of these approaches.

Submissions may address five broad subtopics:
1) Radiation:
The spectral nature of radiation and its implications for climate (e.g., ECS), greenhouse and runaway greenhouse, snowball state, and radiative feedbacks. We believe that radiation offers many opportunities for exchange, since it frequently relies on similar, or even the same, underlying modeling assumptions and parameterizations.
2) Dynamics:
Circulation regimes and transitions between them, including non-dimensional parameter analysis. Communities using idealized aquaplanets are prominent in both fields. Topics may include the effects of gravity, rotation, instellation, atmospheric mass, and characteristic timescales; superrotation; day-night contrasts; circulation cells; or ocean dynamics (e.g., Matsuno-Gill pattern / “lobster”).
3) Convection:
Convection, convective inhibition (e.g., sub-Neptunes), cloud cover, and cloud-resolving models. The latter are at the forefront of both fields, being applied to Earth and other planets.
4) Atmospheric chemistry and aerosols:
Clouds, atmospheric chemistry (e.g., ozone, CH4), and hazes, including their spatial and temporal heterogeneity and their role in exotic climates. In particular, the global distribution of clouds, spanning vast spatial and temporal scales, remains poorly understood.
5) Observables and experiments:
Observational and experimental constraints on fundamental physics, including thermal phase curves, emission and transmission spectra, rotating tank experiments, and cloud/haze analog experiments. This aims to connect observational and experimental research with theoretical approaches, particularly pushing beyond “present-day Earth-like” conditions.

Coupling between subtopics is encouraged but not required and may emerge naturally from this session.