NASA successfully launched the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission on February 8, 2024. The spacecraft carries three groundbreaking instruments: the Ocean Color Imager (OCI), the Hyper-Angular Rainbow Polarimeter #2 (HARP 2), contributed by the University of Maryland Baltimore County, and the Spectro-polarimeter for Planetary Exploration (SPEXone), contributed by the Netherlands. This mission makes simultaneous measurements of the optical properties of water bodies, land, and the atmosphere that are first of their kind. This interdisciplinary session invites research on oceans, lakes, land, aerosols, and clouds, covering topics such as radiative transfer theory, algorithm development (including machine learning), validation, ocean and aquatic system biogeochemistry, terrestrial processes, and atmospheric process studies. Submissions demonstrating the connections between the atmosphere, ocean/aquatic systems, and land, as well as the synergistic use of PACE’s three sensors, are highly encouraged. We welcome the submissions that are using data collected during PACE validation campaigns (e.g., PACE-PAX). The session aims to strengthen collaboration across disciplines to fully utilize PACE’s unique dataset.