Towards a quantification of the water planetary boundary 1 EGU2020-20525 Lan Wang-Erlandsson 1 , Tom Gleeson 2 , Fernando Jaramillo 3 , Samuel C. Zipper 4 , Dieter Gerten 5 , Arne Tobian 5 , Miina Porkka 1 , Heindriken Dahlmann 1 , Agnes Pranindita 1 , Ruud van der Ent 6 , Patrick Keys 7 , Ingo Fetzer 1 , Matti Kummu 8 , Anna Chrysafi 8 , Will Steffen 9 , Hubert Savenije 6 , Makoto Taniguchi 10 , Line Gordon 1 , Sarah Cornell 1 , Arie Staal 1 , Yoshihide Wada 11 , Malin Falkenmark 1 , Johan Rockström 5 1 Stockholm University, Stockholm Resilience Centre, Stockholm, Sweden (lan.wang@su.se) 2 University of Victoria, Canada 3 Stockholm University, Stockholm Sweden 4 Kansas Geological Survey, University of Kansas, USA 5 Potsdam Institute for Climate Impact Research, Germany 6 Delft University of Technology, the Netherlands 7 Colorado State University. USA 8 Aalto University, Finland 9 Australia National University, Australia 10 Research Institute for Humanity and Nature, Japan 11 IIASA, Vienna, Austria Contact: lan.wang@su.se (green water PB) tgleeson@uvic.ca (blue water PB, recent progress not shown in here)