Vienna 15 th April 2015 Luca Brocca(1), Clement Albergel(2), Christian Massari(1), Luca Ciabatta(1), Tommaso Moramarco (1), Patricia de Rosnay(2) (1) Research.

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Vienna 15 th April 2015 Luca Brocca(1), Clement Albergel(2), Christian Massari(1), Luca Ciabatta(1), Tommaso Moramarco (1), Patricia de Rosnay(2) (1) Research Institute for Geo-Hydrological Protection (IRPI-CNR), Perugia, Italy European Geosciences Union General Assembly 2015 (2) European Centre for Medium-Range Weather Forecasts (ECMWF), Reading, UK

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca RAINFALL SOIL MOISTURE The soil moisture variations are strongly related to the amount of rainfall falling into the soil. Therefore, we can use soil moisture observations for estimating rainfall by considering the “soil as a natural raingauge”. What is SM2RAIN?

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca P true =94 mm With only two overpasses the bottom up approach provides a better estimate of the accumulated rainfall P bottom-up =(92-2)= 90 mm “Top down” vs “Bottom up” perspective 5028 The underestimation is due to the satellite overpasses in period with low rainfall P top-down =( )*4= 60 mm 2 92

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca precipitation surface runoff evapotranspiration drainage soil water capacity relative saturation Inverting for p(t): = soil depth X porosity Assuming: ++ during rainfall Soil water balance equation SM2RAIN algorithm THESE ASSUMPTIONS WERE FREQUENTLY CRITICIZED BY REVIEWERS … AND COLLEAGUES

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca SM2RAIN dataset from ASCAT, 0.25°, , freely available SM2RAIN papers…so far!

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca Synthetic data Average daily correlation=0.94! Real data calibration validation 0.75<R<0.95 In situ soil moisture observations SM2RAIN: in situ observations Soil moisture variations 64% Drainage 30% Percentage contribution to the total simulated rainfall of the different components of the water balance Evapotranspiration 4% Runoff 2%

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca Correlation map between 5-day rainfall from GPCC and the rainfall product obtained from the application of SM2RAIN algorithm to ASCAT, AMSR-E and SMOS data plus TMPA 3B42RT (VALIDATION period ) SM2RAIN: satellite observations

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca Global monthly rainfall from ASCAT

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca SM2RAIN CRASH TEST 1)Global land surface simulation with the latest ECMWF land surface model (period ) driven by ERA-Interim atmospheric reanalysis 2)Extraction of modelled soil moisture data for the first three soil layers (0-7, 0-28, cm) 3)Application of SM2RAIN to modelled soil moisture data for each soil layer (0-7, 0-28, cm) 4)Comparison of SM2RAIN-derived rainfall with true rainfall data (from ERA-Interim) used to drive the land surface simulations

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca CRASH TEST: 1 layer vs 3 layers First soil layer (0-7 cm) Root-zone (0-100 cm) Proxy of the investigation depth of satellite sensors Added-value of root-zone information, with 2 soil layers (0-28 cm) results are similar (median R=0.790.

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca CRASH TEST: timeseries Central Italy Central Australia South USA Siberia Congo

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca Error estimation of SM products 5)Adding random perturbation to modelled soil moisture data the error in the satellite products can be estimated ASCAT/AMSR2 SMOS/SMAP Sentinel-1SMOS /SMAP target

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca For each land pixel… ASCAT/SMOS correlation Estimated ERROR=0.14 m 3 m -3 Estimated ERROR=0.04 m 3 m -3 Error estimation ASCAT & SMOS Lower temporal resolutio n

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca Error estimation ASCAT & SMOS Higher error of SMOS along the coast (spatial resolution issue) Good performance of both sensors except in the central region

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca Early Warning System for Flood and Fire forecasting Massari et al. (2014, HESS) Use of different soil moisture dataset for flood forecasting Sensor at 25 cm depth: missing summer rainfall FLOOD MODELLING APPLICATION

EGU 2015 Vienna 15 th Apr 2015 Brocca Luca ○SM2RAIN algorithm shows consistent results on a global scale ○Runoff and evapotranspiration seems not to play a significant role, while temporal resolution and saturation have a greater impact ○The application of the crash test together with SM2RAIN algorithm can be exploited for estimating the error in satellite soil moisture products