Patricia de Rosnay is leading the Coupled Assimilation Team of the European Centre for Medium-Range Weather Forecasts (ECMWF). Her interest is in interface observations data assimilation for NWP and reanalysis. Her Team is in charge of the developments of coupled Earth system assimilation, land surface assimilation and ocean and sea ice assimilation in the ECMWF NWP systems. She has a Ph.D degree in physics on climate modelling. She has been involved in SMOS soil moisture data assimilation activities and member of the H SAF project Team for more than 10 years. She is also a member of the WMO Global Cryosphere Watch Steering Group and co-lead of the WMO SnowWatch Team.