Recent Advances in Land Surface Albedo Generation Recent Advances in Land Surface Albedo Generation from European Satellite Sensors (POLDER, MSG, from European Satellite Sensors (POLDER, MSG, VEGETATION) VEGETATION) O. HAUTECOEUR, D. CARRER, O. HAUTECOEUR, D. CARRER, J.-L. ROUJEAN J.-L. ROUJEAN , B. GEIGER, C. , B. GEIGER, C. MEUREY MEUREY C entre N ational de R echerches M étéorologiques (CNRM) / GAME Météo-France / CNRS
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Recent Advances in Land Surface Albedo Generation from European Satellite Sensors (POLDER, MSG, VEGETATION) O. HAUTECOEUR, D. CARRER, J.-L. ROUJEAN, B.
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Recent Advances in Land Surface Albedo Generation from Recent Advances in Land Surface Albedo Generation from
O. HAUTECOEUR, D. CARRER, O. HAUTECOEUR, D. CARRER, J.-L. ROUJEANJ.-L. ROUJEAN, B. GEIGER, C. MEUREY, B. GEIGER, C. MEUREY
Centre National de Recherches Météorologiques (CNRM) / GAME
Météo-France / CNRS
A global analysisA global analysis
Comparison with other land surface albedos according following Comparison with other land surface albedos according following criteria: criteria: globalglobal, , routinely disseminatedroutinely disseminated, , free accessfree access. .
2 classes of products are analysed:2 classes of products are analysed:
a)a) Albedos issued from radiation transfer codes and GCMsAlbedos issued from radiation transfer codes and GCMs
(ISCCP, ECMWF, ARPEGE)(ISCCP, ECMWF, ARPEGE)
b) Albedos issued from a Ground Segment of remote sensing b) Albedos issued from a Ground Segment of remote sensing data processingdata processing
(MISR, MODIS, MSA)(MISR, MODIS, MSA)
A local analysisA local analysis
Comparison with ground-based pyranometers:Comparison with ground-based pyranometers:
BSRN, ARM, SURFRAD, CarboEurope, AsiaFluxBSRN, ARM, SURFRAD, CarboEurope, AsiaFluxObjective criteriaObjective criteria: seasonal trend, spatial coherence, gap filling, % of erroneous data, : seasonal trend, spatial coherence, gap filling, % of erroneous data, quality assessment, attempt of error explanation by other means.quality assessment, attempt of error explanation by other means.
Validation plan - Overview
Peculiarities of observing systemsPeculiarities of observing systems
Reflectance of woody and herbacious vegetation (Asner),
soil and snow reflectance (ASTER); Solar Irradiance (E/2000,W/m2/nm)
[ARPEGE - POLDER] - range of variations [-0.25 ; 0.25 ]
ECMWF
POLDER
ECMWF
POLDER
-0.25 0.25
15 Avril 2003 15 Octobre 2003
-0.25 0.25
[ECMWF - POLDER] - range of variations [-0.25 ; 0.25 ]
MSA
POLDER
MODIS
POLDER
-0.25 0.25
-0.25 0.25
15 April 2003 15 June 2003
[MSA - POLDER] - range of variations [-0.25 ; 0.25 ]
MSA
Meteosat Surface Albedo < JRC + EUMETSAT
-0.25 0.25
-0.25 0.25
MISR
POLDER
MODIS
POLDER
-0.25 0.25
15 April 2003 15 June 2003
[MISR - POLDER] - range of variations [-0.25 ; 0.25 ]
MISR
-0.25 0.25
-0.25 0.25
MODIS
POLDER
MODIS
POLDER
-0.25 0.25
-0.25 0.25
15 April 2003 15 June 2003
[MODIS - POLDER] - range of variations [-0.25 ; 0.25 ]
MODIS
-0.25 0.25
-0.25 0.25
SURFRAD
POLDER
MODIS
CarboEurope & AsiaFlux
PAR albedo
PAR albedo
Shortwave albedo
Shortwave albedo
POLDER
MODIS
The main purpose of the Land SAF is to increase the benefits from The main purpose of the Land SAF is to increase the benefits from MSG/SEVIRIMSG/SEVIRI and and EPS/AVHRR-3EPS/AVHRR-3 data related to data related to landland, , land-atmosphere interactionsland-atmosphere interactions and and biophysical biophysical applicationsapplications, namely by , namely by developing techniquesdeveloping techniques, that will allow a more effective use of , that will allow a more effective use of data from the two planned EUMETSAT satellites (MSG and EPS)data from the two planned EUMETSAT satellites (MSG and EPS)
SAF on Land Surface AnalysisSAF on Land Surface Analysis
- Essential climate variableEssential climate variable to assess energy budget (via net absorbed radiation) in Numerical Weather Prediction (NWP) and climate modeling
- SpecificationsSpecifications required by end-users community for a snow-free albedo product is assessed around 0.03 (absolute units)
- ValidationValidation is the process of determination by which a model provides a representation of the truth. Typically, it yields an analysis of the spatial variability ( i.e. the representation of the gradients at the continental scale ), plus the temporal evolution, typically over an annual cycle.
Spectral responses of sensor channelsSpectral responses of sensor channels