Julia Uitz specializes in marine biogeochemistry and phytoplankton dynamics, with particular emphasis on community composition and associated impacts on carbon fluxes and marine ecosystems. Her research develops and applies approaches that combine bio-optical observations from BGC-Argo profiling floats, ocean color satellites, and research vessels, across regional systems such as the Mediterranean Sea and the Southern Ocean as well as at the global scale. She serves as coordinator of the BGC-Argo component of the Argo-France observing system and is involved as co-PI of the Argo-2030 project (PIA-3 EquipEx), which aims to advance the deployment of ecological sensors on profiling floats. She is the scientific coordinator of the SAPIGH HPLC pigment analysis facility, and co-chair of the scientific committee GMMC (Groupe Mission Mercator Coriolis) within the CNRS national program LEFE. She has co-authored more than 60 publications.