The 7th Data Science Symposium took place at Helmholtz-Zentrum Hereon, Geesthacht (Germany), on 27 and 28 June 2022. The Data Science Symposium is part of a series of symposia organized by AWI, GEOMAR and Hereon that was established in 2017. The focus of the symposium was on the following topics: • Artificial Intelligence/ Machine Learning in Earth System Sciences • Data Strategies and Exchange in POF IV • Collaborations and Initiatives • Towards Digital Twins and other Lighthouse Projects • Early Career – Science and Perspectives This book of abstracts contains all abstracts of all presentations, posters and live demos presented at the symposium.We thank all authors for their contributions to the Data Science Symposium N...