1669_LAND_SURFACE_ALBEDO_AND_DOWNWELLING_SHORTWAVE_RADIATION_FROM_MSG_GEOSTATIONARY_SATELLITE_METHOD_FOR_RETRIEVAL_VALIDATION_AND_APPLICATION.pdf
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1669_LAND_SURFACE_ALBEDO_AND_DOWNWELLING_SHORTWAVE_RADIATION_FROM_MSG_GEOSTATIONARY_SATELLITE_METHOD_FOR_RETRIEVAL_VALIDATION_AND_APPLICATION.pdf

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  • 1. LAND SURFACE ALBEDO ANDDOWNWELLING SHORTWAVE RADIATIONFROM MSG GEOSTATIONARY SATELLITE (METHOD FOR RETRIEVAL, VALIDATION, AND APPLICATION) Dominique Carrer, Jean-Louis Roujean, Olivier Hautecoeur,Jean-Christophe Calvet, Jure Cedilnik, Laurent Franchistéguy, Bernhard Geiger, Sebastien Lafont, Jean-François Mahfouf , Catherine Meurey , and Isabel Trigo
  • 2. 2 OUTLINELSA SAF projectSurface Albedo Products method for retrieval evaluation application for weather forecastDSSF evaluation impact on the modelled land water and energy budgetPerspectives IGARSS Conference 2011, Vancouver
  • 3. 3 OUTLINELSA-SAF projectSurface Albedo Products method for retrieval evaluation application for weather forecastDSSF evaluation impact on the modelled land water and energy budgetPerspectives IGARSS Conference 2011, Vancouver
  • 4. 4 LSA-SAF CHRONOGRAMLSA-SAF: Satellite Application Facility on Land Surface Analysis IGARSS Conference 2011, Vancouver
  • 5. 5OPERATIONAL SYSTEM (http://landsaf.meteo.pt)IGARSS Conference 2011, Vancouver
  • 6. 6THE Land-SAF CONSORTIUM IGARSS Conference 2011, Vancouver
  • 7. 7 THE PRODUCTS Product Acronym Type InstitutionSurface Albedo AL OP MFBi-directional Reflectance BRDF OP-Int MFDistribution FunctionLand Surface Temperature LST OP IM POC-Thermal Surface Parameter TSP IMK IntEmissivity EM OP-Int ICATDownwelling Surface Short-wave DSSF OP MFFluxesDownwelling Surface Long-wave DSLF OP IMFluxesSnow Cover SC OP SMHIEvapotranspiration ET OP RMIFractional Vegetation Cover FVC OP UVLeaf Area Index LAI OP UVRisk Fire Manager RFM DEM IDLFire Radiative Power & Energy FRP&FRE OPFraction of Absorbed fAPAR OP UVPhotosynthetic Active Radiation IGARSS Conference 2011, Vancouver
  • 8. 8 SNOW COVERIGARSS Conference 2011, Vancouver
  • 9. 9 SURFACE ALBEDOIGARSS Conference 2011, Vancouver
  • 10. 10LAND SURFACE TEMPERATURE IGARSS Conference 2011, Vancouver
  • 11. 11SHORT-WAVE RADIANCEIGARSS Conference 2011, Vancouver
  • 12. 12LONG-WAVE RADIANCEIGARSS Conference 2011, Vancouver
  • 13. 13FRACTIONAL VEGETATION COVER IGARSS Conference 2011, Vancouver
  • 14. 14 LEAF AREA INDEXIGARSS Conference 2011, Vancouver
  • 15. 15 fAPARIGARSS Conference 2011, Vancouver
  • 16. 16 THE PRODUCTSIGARSS Conference 2011, Vancouver
  • 17. 17 OUTLINELSA-SAF projectSurface Albedo Products method for retrieval evaluation application for weather forecastDSSF evaluation impact on the modelled land water and energy budgetPerspectives IGARSS Conference 2011, Vancouver
  • 18. 18 PRODUCT CHARACTERISTICS (AL) Spatial Resolution: 3km at the Sub-Satellite Point Projection: native MSG/SEVIRI Projection Production Frequency: Daily Effective Temporal Resolution: 5 Days (in the near future also monthly) Format: HDF5Colour Composite Of Timeliness: 3 hours Spectral Albedo Dissemination: EUMETSAT broadcast system (EUMETCast), and project website (http://landsaf.meteo.pt) Spectral Albedo (6): 0.6µm, 0.8µm, and 1.6µm (DH&BH) BroandBand Albedo (4): VIS-DH ([0.4µm, 0.7µm] ), NIR-DH ([0.7µm, 4.0µm]), SW-DH ([0.3µm, 4.0µm]), SW-BH ([0.3µm, 4.0µm]) IGARSS Conference 2011, Vancouver
  • 19. 19 METHOD FOR RETRIEVAL TOA Reflectance Factorfor each slot ∆t=15min Atmospheric AL1 Geometry Atmosphere Correction TOC Reflectance Factor BRDF Model Geometry Previous Model Estimate Inversionfor each day ∆t=1day AL2 Model Parameters k, Ck Geometry Integration Albedo IGARSS Conference 2011, Vancouver
  • 20. 20 ALBEDO INPUT DATA• MSG Data: 0.6µm, 0.8µm, 1.6µm• Solar and View Angles• Land/Sea Mask• Cloud Mask (SAF-NWC software)• Total Column Water Vapour, and Pressure (ECMWF)• Ozone Content (Climatology)• Aerosol Optical Thickness (Climatology) IGARSS Conference 2011, Vancouver
  • 21. 21COMPARISON WITH MODIS ALBEDO (1/2) [0.4µm,0.7µm] over Europe (from 2005-06-01 to 2006-10-01)16-day average MSG Albedo [0.7µm,4µm] – MODIS albedo projected on SEVIRI grid [0.3µm,4µm] 10-25 of June 2006 IGARSS Conference 2011, Vancouver
  • 22. 22COMPARISON WITH MODIS ALBEDO (2/2) 12-27 of July 2006 IGARSS Conference 2011, Vancouver
  • 23. 23ALBEDO TIME SERIES (snowfall episodes) (Estonia)Modis SW-BH albedo (boreal forest)MSG albedo ground measurements (Germany) (mixed shrub/tree) IGARSS Conference 2011, Vancouver
  • 24. 24 ALBEDO TIME SERIES (aerosol events) X10 for AOT Modis SW-DH albedo SAF-Land albedo ground measurements RainfallThe temporal evolution of the albedo estimate is related to the evolution of surfaceproperties (typically rainfall). The spurious fluctuations appear to be caused byaerosol effects. IGARSS Conference 2011, Vancouver
  • 25. 25 SUMMARY OF PERFORMANCES (AL)Accuracy Over mid-latitude region: bias: 5% in relative units for SW and NIR broadband albedo (except for snow/ice pixels) – bellow 0.01 in absolute unit 20% for VIS broadband albedo (potentially due to the use of different BRDF models and aerosol products) stdev: 0.015 for VIS and 0.030 for NIR and SW (or BB) Over brightening surfaces (North Africa): no degradation in relative unitsPublications:Geiger, B., Carrer D., Franchistéguy L., Roujean J.-L., Meurey C., 2008, “Land Surface Albedo derived on adaily basis from Meteosat Second Generation Observations”, IEEE Transactions on Geoscience and RemoteSensing, 46, 3841–3856, doi:10.1109/TGRS.2008.2001798.Carrer, D., Roujean J.-L., Meurey C., “Evaluating operational MSG/SEVIRI land surface albedo products fromLSA-SAF with ground measurements and MODIS”, IEEE Transactions on Geoscience and Remote Sensing,doi:10.1109/TGRS.2009.2034530. (Product User Manual, and Validation Report, internal documents) IGARSS Conference 2011, Vancouver
  • 26. 26 APPLICATION FOR WEATHER FORECASTWeather forcast model: ALADIN (~9.5km)Two experiments: with ALADIN albedo and with LSA-SAF albedo analysisRun every day at 00h (2007) - 54h forcast Surface albedo 15022007 00UTC+12 2m temperature 15022007 00UTC+12 LandSAF-reference LandSAF-reference no assimilation of LandSAF albedo snow/ice pixels is lower than Aladin albedo a lower albedo induced warmer atmospheric T2m Conclusion of Score Study: weather model has a significant cold bias in winter. Satellite data permit to reduce this bais. (J. Cedilnik, D. Carrer, J.-L. Roujean and J.-F. Mahfouf, “Analysis of satellite derived surface albedo for numerical weather prediction”, to submit) IGARSS Conference 2011, Vancouver
  • 27. 27 OUTLINELSA-SAF projectSurface Albedo Products method for retrieval evaluation application for weather forecastDSSF evaluation impact on the modelled land water and energy budgetPerspectives IGARSS Conference 2011, Vancouver
  • 28. 28PRODUCT CHARACTERISTICS (DSSF) Spatial Resolution: 3km at the Sub-Satellite Point Projection: native MSG/SEVIRI Projection Production Frequency: 30 Minutes Instantaneous Flux Estimate DSSF Format: HDF5 Estimate Timeliness: 3 hours Dissemination: EUMETSAT broadcast system (EUMETCast), and project website (http://landsaf.meteo.pt) Wavelength interval: [0.3µm, 4.0µm]Processing Flag IGARSS Conference 2011, Vancouver
  • 29. 29 EVALUATION OF DAILY DOWNWELLING SHORTWAVE SURFACE FLUXES (DIDSSF) LSA-SAF product DIDSSF ECMWF (DSR) product(Geiger, B, C. Meurey, D. Lajas, L. Franchistéguy, D. Carrer, and J.-L. Roujean, 2008: Near real-timeprovision of downwelling shortwave radiation estimates derived from satellite observations, RoyalMeteorological Society, 15, 411-420.) IGARSS Conference 2011, Vancouver
  • 30. 30 DSSF: IMPACT ON THE MODELLED LAND WATER AND ENERGY BUDGETland surface model: ISBA 4 experiments: SAFRAN atmospheric analysis (Ref) or LSA-SAF DSSF and DSLF Difference statistics of Net Radiation (RN) over Aurade station based on ISBA simulations in using various forcing • When satellite data are considered, the standard deviation of net radiation simulated with ISBA model can decease by 20 W.m-2 in comparison with ground-measurements. • As many areas lack a high resolution meteorological forcing, the LSA-SAF radiative products provide new and valuable information. (D. Carrer, S. Lafont, J.-L. Roujean, J.-C. Calvet, C. Meurey, P. Le Moigne, and I. Trigo, 2011: Incoming solar and infrared radiation derived from METEOSAT: impact on the modelled land water and energy budget over France, Submitted to J. Of Hydrometeorology.) IGARSS Conference 2011, Vancouver
  • 31. 31 OUTLINELSA-SAF projectSurface Albedo Products method for retrieval evaluation application for weather forecastDSSF evaluation impact on the modelled land water and energy budgetPerspectives IGARSS Conference 2011, Vancouver
  • 32. 32 OPEN ISSUES AND FURTHER DEVELOPMENTS•2011-2012:1/ tuning of algorithms2/ high latitude coverage: extension achieved due to the merging of MSG and MetOp data.3/ to strengthen validation: over Africa & snow covered areas4/ use in NWP models: - radiative forcing (DSSF & DSLF). - surface analysis (albedo).5/ aerosols: - operational algorithm under development.(Carrer, D., J.-L. Roujean, O. Hautecoeur, and T. Elias (2010), Daily estimates of aerosol opticalthickness over land surface based on a directional and temporal analysis of SEVIRI MSG visibleobservations, J. Geophys. Res., 115, D10208, doi:10.1029/2009JD012272.)•Until 2019:=> The LSA-SAF program provides a mean to constrain the climate trendin Europe, Africa, and South America thanks to the insurance of aconstant production foreseen until at least 2019. IGARSS Conference 2011, Vancouver
  • 33. 33e-mail: dominique.carrer@meteo.fr IGARSS Conference 2011, Vancouver
  • 34. 34 MANY THANKSIGARSS Conference 2011, Vancouver