MethaneSAT Level-4 Dispersed Emissions Product: Algorithm Theoretical Basis Document

The MethaneSAT Level-4 (L4) dispersed emissions product is an estimate of methane emissions within a MethaneSAT scene, reported on a 4 km $\times$ 4 km grid and representative of a scene dependent temporal window of up to 28 h before the observation. MethaneSAT L4 emissions estimates are generated using the Column Observations to Regional Emissions (CORE) algorithm, a computational framework that integrates MethaneSAT observations with atmospheric transport modeling within a Bayesian inversion. This Algorithm Theoretical Basis Document (ATBD) describes the theoretical formulation, assumptions, data inputs, and implementation of CORE.