2012 PWG Workshop Presentations Welcome Bette Otto-Bliesner, NCAR-CGD Project Update: Developing isotope tracers in the CESM Esther Brady, NCAR-CGD Water isotope tracer development in POP2 Jiaxu Zhang Water isotopes in CAM5: Recent improvements Jesse Nusbaumer Incorporation of water isotopologues in CLM4 Tony Wong Modeling water isotopes in sea ice Dave Bailey, NCAR-CGD Carbon isotopes in CESM Alexandra Jahn, NCAR-CGD Decadal to centennial timescales of variability in CESM Toby Ault, NCAR-CGD