Constraining Sunlight Absorption of BrC from Anthropogenic Sources and Wildfires with Multiple-type Observations and Models

Brown carbon (BrC) from anthropogenic activities and wildfires significantly impacts atmospheric processes through its sunlight absorption properties. This study aims to constrain the understanding of BrC's light absorption using multiple observations and models, providing a comprehensive assessment of its environmental implications. Anthropogenic sources and wildfires release BrC with distinct characteristics, influencing regional and global aerosol optical properties. By integrating field measurements, laboratory analyses, satellite products, and climate models, this research quantifies BrC's absorption across different spectral ranges and evaluates its contribution to radiative forcing. The results highlight the need for refined models to accurately represent BrC's complex behavior and improve predictions of its impacts on climate and air quality. This abstract presents the methodology, findings, and future directions for constraining BrC's sunlight absorption.