The physical limnology working group met at the 100th SIL Congress in Berlin. As a result, subgroups are being formed of modelers and observational scientists with the goal to improve validation of 1 and 3-D hydrodynamic models, for physical-biological coupling with special interest in phytoplankton, to evaluate the gas exchange velocity used to model fluxes of climate forcing trace gases and oxygen across the air-water interface, and to evaluate inshore-offshore exchanges in lakes and reservoirs. We would additionally like to plan joint experiments on key topics. New members are welcome to join and contribute to these activities.