IASCThe 2019 Cryosphere and Atmospheric chemistry (CATCH) Open Science Workshop was held in UC Berkeley, California, USA on 7-8 December 2019. CATCH activity is a multidisciplinary community of scientists investigating the chemistry, biology, and physics in cold regions of the Earth, including a specific focus on the Arctic region. The goal of the workshop was to build upon their recent publication Fostering multidisciplinary research on interactions between chemistry, biology, and physics within the coupled cryosphere-atmosphere system by discussing research challenges and identify the most urgent scientific needs. Read the report here.