Perturbed Parameter Ensembles (PPEs) are a powerful tool enabling process understanding and uncertainty quantification in numerical models, including Earth System Models (ESMs). For this session, we invite presentations on the design and use of PPEs spanning computational model types and ESM components (e.g., atmosphere, land, ocean, ice). Model configurations across spatial scales and complexities are of interest. We welcome submissions that target development of methods for coupled and uncoupled PPEs. Submissions focused on using PPEs for addressing general science questions, model calibration, development of observing system simulation experiment (OSSE) frameworks, and those enabling insight on whether process representation is limited by parameterization structure or parameter settings, are encouraged. Submissions that discuss how model uncertainty is shaped by particular ESM components versus that which arises from use of coupled configurations are also welcomed. 

• A - Atmospheric Sciences
• B - Biogeosciences
• H - Hydrology
• OS - Ocean Sciences