Alexandra Jahn

Alexandra Jahn is an Associate Professor in the Department of Atmospheric and Oceanic Sciences at the University of Colorado Boulder. She leads the Polar & Paleoclimate Modeling Group, focusing on Arctic climate dynamics, paleoclimate modeling, and climate model evaluation.

• PhD from McGill University (2010)
• Dipl. from Free University of Berlin (2004)
• Exchange Student at University of Washington (2001)

Her research integrates climate modeling and observational data to study polar regions, emphasizing Arctic sea ice variability, ocean circulation changes during glacial periods, and isotope modeling. Current projects examine natural vs. forced climate trends in the Arctic, commercial shipping accessibility projections, and paleoceanographic transitions during deglaciation.

Recent publications analyze Arctic sea ice dynamics under different emission scenarios, paleoceanographic changes during glacial periods, and model-data comparison improvements. Her work reveals trends in CMIP6 forcing uncertainties, Arctic freshwater dynamics, and North Pacific deep water formation during warm periods.

• Alexander von Humboldt Fellowship (2022)
• NSF CAREER Award (2019)
• NCAR Postdoctoral Fellowship (2012)
• German National Academic Foundation Fellowships (2001, 2006)

Alexandra mentors graduate students and postdocs in climate modeling, oceanography, and Arctic research. She teaches courses in climate science, physical oceanography, numerical methods, and scientific writing. Her lab connects climate models with paleo records to understand past and future climate changes.