Patricia received her Ph.D degree in climate modelling from the University Pierre et Marie Curie (Paris 6, France) in 1999. She developed the physically-based multi-layer hydrology, the sub-grid scale representation of vegetation and soil texture and the irrigation parameterisation in the ORCHIDEE land surface model at the Laboratoire de Météorologie Dynamique (LMD/IPSL, Paris, France).
From 1999 to 2002, she worked on global land surface modelling developments and she developed the irrigation parameterisation in the ORCHIDEE land surface model at the Laboratoire de Météorologie Dynamique (LMD/IPSL, Paris, France).
From 2002 to 2007 she worked as research scientist (Chargé de Recherche) for the French CNRS (Centre National de la Recherche Scientifique) at CESBIO (Toulouse). She was inloved in soil moisture and passive microwave radiometry observation field experiments (SMOSREX, AMMA, Nafe2005), in the Soil Moisture and Ocean Salinity (SMOS) satellite mission preparation, and in coordinated land surface modelling experiments (ALMIP).
Since 2007 Patricia has been working at ECMWF in secondment from her CNRS position.
From 2007 to 2008 she developed the current version of the Community Microwave Emission Modelling Platform (CMEM) which is used for SMOS monitoring and data assimilation.
From 2008 to 2015 she was in charge of the ECMWF LDAS, Team Leader from 2014, used to initialize the land surface prognostic variable for NWP. Her activities include developments related to: screen level data assimilation and interface to observations, snow data assimilation and monitoring, ASCAT and SMOS data assimilation, and methodological developments of land surface analysis (OI, SEKF, EDA-EKF).
Since 2016, Patricia de Rosnay has been the Coupled Assimilation Team Leader. Her activities are focused on developments of coupled Earth System data assimilation across the ECMWF systems, including reanalysis, and medium and extended range NWP systems (monthly and seasonal forecasts).