ECMWF/ H-SAF and HEPEX Workshops on coupled hydrology 03-07 November 2014 Reading, UK Global monitoring of root zone soil moisture from scatterotmeter data assimilation : methodology and validation C. Albergel, P. de Rosnay, L. Isaken, J. Muñoz-Sabater (1) (1)European Centre for Medium Weather Forecast (ECMWF), Reading, UK Thanks to : A. Al-Yaari, J.-P. Wigneron (2), C. Massari, L. Brocca (3), P. Laiolo, S. Gabellani, F. Delogu(4), P. Struzik(5) (2)INRA, UMR1391 ISPA, Bordeaux, France (3)Research Institute for Geo-Hydrological Protection, CNR , Italy (4)CIMA Research Foundation, Savona, Italy (5)Institute of Meteorology and Water Management, Krakow, Poland 05/11/2014 1 H-SAF project of EUMETSAT  Satellite Application Facility on support to operational Hydrology and water management / CDOP-2 (Feb.2012 – Feb. 2017)  Objectives : to provide and validate new satellite-derived products from existing and future satellites with sufficient time and space resolution to satisfy the needs of operational hydrology  Precipitation (liquid, solid, rate, accumulated)  Soil moisture (large-scale, local-scale, surface, in the roots region)  Snow (detection, cover, melting conditions, water equivalent) http://hsaf.meteoam.it 05/11/2014 2 Soil moisture: Essential Climate Variable (GCOS)  Crucial variable for numerical weather and climate predictions  Influence weather through its impact on evaporation and other surface energy fluxes  Controls the partitioning of Energy (latent / sensible heat fluxes) at the soil-atmosphere interface  Key variable in hydrological processes  Controls the partitioning of Precipitation into infiltration/runoff  Controls evaporation from bare soil, transpiration from vegetation  Impact on plant growth and carbon fluxes 05/11/2014 3 Soil moisture: Essential Climate Variable (GCOS)  Crucial variable for numerical weather and climate predictions  Influence weather through its impact on evaporation and other surface energy fluxes  Controls the partitioning of Energy (latent / sensible heat fluxes) at the soil-atmosphere interface  Key variable in hydrological processes  Controls the partitioning of precipitation into infiltration/runoff  Controls evaporation from bare soil, transpiration from vegetation  Impact on plant growth and carbon fluxes 05/11/2014 4 How to obtain soil moisture estimates? In situ measurements Obs. (0-30cm) 05/11/2014 5 How to obtain soil moisture estimates? In situ Land Surface Model measurements HTESSEL forced by ERA- Interim near-surface meteorology Obs. (0-30cm) HTESSEL (0-28cm) 05/11/2014 6 How to obtain soil moisture estimates? In situ Land Surface Model Surface Soil moisture from measurements space HTESSEL forced by ERA- Interim near-surface SMOS meteorology ASCAT Obs. (0-30cm) HTESSEL (0-28cm) ASCAT SSM 05/11/2014 7 How to obtain soil moisture estimates?  Spatial Remote Sensing : unique opportunity to observe SM at a global scale April 2010 ASCAT April 2010 SMOS (Figure from : http://www.esa-soilmoisture-cci.org) 05/11/2014 8 Soil moisture analysis  Remote Sensing : provides quantitative information about the water content of a shallow near surface layer  Main variable of interest for applications such as meteorological modelling, hydrological studies : root-zone soil moisture  Assimilation algorithms :  Soil Moisture Analysis  Combines observations and model trajectory  Propagates information from surface observations into deeper layers  Provides values when there is no satellite data (from the model propagation) 05/11/2014 9 HSAF Project at ECMWF  Contributor to the core H-SAF soil moisture products  Our H-SAF activities are centred around the development of surface and root zone soil moisture based on scatterometer data assimilation  SM-DAS-2 (H14), operational since 07/2012  Surface and root zone liquid soil moisture index  Based on physical soil freezing processes representation, expressed into liquid soil moisture index by normalizing using the saturated soil moisture value (function of soil texture)  SM-DAS-3 (H27), end of CDOP-2  Re-analysis of SM-DAS-2  Provide long time series of the liquid root zone soil moisture index (covering 1992-2014) 05/11/2014 10