For the open session, we welcome contributions on all aspects of ocean circulation from observations, models and theory, from regional to global scales, from air-sea exchanges to abyssal mixing. This year we particularly encourage studies on the decadal to interdecadal variability and the internal and externally forced physical processes in the ocean. Because accurate estimation of surface energy and mass fluxes is critical for the closure of the ocean energy budget and the ocean impact on the atmosphere, this session also welcomes works dealing with a broad range of surface energy flux studies, including those focusing on the fundamentals of air-sea flux physics, on production and assessment of air-sea flux estimates, and on application of air-sea flux products in other fields of climate science. As usual the OS1.1 session also welcomes submissions that do not fit to any of the other special sessions.