GEOMAR Helmholtz Centre is seeking a Postdoctoral Researcher to contribute to EU-funded projects focused on developing quality standards for marine CO2 research. The successful candidate will work on creating in-house reference materials for marine CO2 research, developing Standard Operating Procedures (SOPs), and conducting long-term testing of pCO2 instruments. The role also involves fieldwork and participation in research sea campaigns. Ideal candidates should have a Ph.D. in marine science or a related field, with experience in chemical analysis and proficiency in data analysis tools such as Matlab or Python.