Cite as: Jonkers, L.; Bothe, O.; Kucera, M.: Preface: Advances in paleoclimate data synthesis and analysis of associated uncertainty: towards data–model integration to understand the climate. In: Climate of the Past. Vol. 17 (2021) 6, 2577 - 2581. (DOI: /10.5194/cp-17-2577-2021)