MODIS/Meteosat/MISR Surface Albedo Comparison Exercise B. Pinty (1), M. Taberner (1), S. Liang (2), Y. Govaerts (3), J.V. Martonchik (4), Lattanzio (5),

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Presentation transcript:

MODIS/Meteosat/MISR Surface Albedo Comparison Exercise B. Pinty (1), M. Taberner (1), S. Liang (2), Y. Govaerts (3), J.V. Martonchik (4), Lattanzio (5), C. Barker Schaaf (6), M. M. Verstraete (1), R. E. Dickinson (7), N. Gobron (1), and J-L. Widlowski (1) (1) Institute for Environment and Sustainability of EC-JRC, Ispra (VA) Italy (2) University of Maryland, College Park, USA (3) EUMETSAT, Darmstadt, Germany (4) Jet Propulsion Laboratory, Caltech, Pasadena, USA (5) Makalumedia gmbh, Darmstadt, Germany (6) Boston University, Boston, USA (7) SEAC, Georgia Institute of Technology, Atlanta, USA 2nd CEOS/WGCV/LPV Workshop on Albedo Products, Vienna, April 27-28, 2005

Various types of Surface albedo (1) BHR : Bi-Hemispherical Reflectance is the ratio between the upward and the downward radiant fluxes, that is, accounting for the downwelling diffuse intensities from the sky. Depends on both surface and ambient atmospheric radiative properties and …the Sun angle. All quantities can be defined monochromatic or broadband

Various types of Surface albedo (2) DHR: Directional Hemispherical Reflectance is the ratio between the upward flux and the downward collimated flux coming thus from one single direction (Black sky). Depends on surface radiative properties and …the Sun angle. All quantities can be defined monochromatic or broadband BHR iso : If the downwelling diffuse intensities from the sky is assumed fully isotropic then the BHR is equal to the integral of the DHR over all incoming directions (White sky). Depends on surface radiative properties only.

Surface albedo products from space agencies MODIS delivers DHRs (Black sky) and BHR iso (White sky) MISR delivers DHRs and BHRs as flux ratios but under ambient conditions and for the Sun illumination conditions at time of observations EUMETSAT delivers DHRs for a fixed Sun angle and all information needed to reconstruct the DHRs and BHRiso and all information needed to reconstruct the DHRs at any other Sun angle as well as the BHRiso to reconstruct the BHRs may require some investments or some level of assumption The albedo products may also differ wrt the spectral bands of integration they refer to.

Parameterization of the surface- atmosphere radiative coupling Assuming that the field of downwelling diffuse intensity reaching the surface is PERFECTLY isotropic yields a convenient parameterization for the BLUE SKY ALBEDO Surface level Sun angle Atmospheric optical depth (type of atmosphere) Surface BRF (amplitude and shape) ratio of direct to total downward flux ratio of diffuse to total downward flux with Pinty et al., JAS, 2005

Surface albedo comparison Perform a comparison between MODIS-Meteosat- MISR surface albedo products : a user perspective. Compare similar physical quantities, e,g., BHRs, BHR iso, DHRs. Based on year 2001 products: latest public version available. For two large geographical regions : Africa- Southern Europe and North-East Europe.

Comparison of Surface BHR iso products from MODIS/Meteosat/MODIS Select the same period of time and identical geographical regions Achieve the needed transformations (e.g., BHRs, spectral conversions) to ensure comparison of physical quantities having same meaning Identify the product values showing appropriate QA

Albedo comparison for an ‘Ideal’ Band ( μm)

Govaerts, pers. Com

Spectral Correction for the Meteosat large band effects

Spectral conversion to the ‘Ideal’ Band ( μm) MeteosatMISR

January 2001

MISR low & MODIS high MISR high & MODIS low

January 2001

Histogram of BHR iso differences

(MISR-MODIS) Albedo

June 2001 January 2001 Using Shunlin’s conversion factors Using Yves’s conversion factors

January 2001

Mean BHR values over common area with valid values from one of the two other sensors

Ratio of the mean values

Primary Eigenvectors

Correlation between pairs of samples

Results for year 2001 Shortwave domain ( μm) Africa –Southern Europe

Primary Eigenvectors

October 2001

Results for year 2001 Visible domain ( μm)

Results for year 2001 Near-infrared domain ( μm)

Results for year 2001 Shortwave domain ( μm) Northern –Eastern Europe

Full inversion Magnitude inversion Backup solution

Mean BHR values over common area with valid values from one of the two other sensors Full inversion

Primary Eigenvectors Full inversion

Northern –Eastern Europe Hexadecad 6: End of March 2001

Issues and caveats An error was recently identified in the MISR processing code: BHRs tend to be biased high by about 2 to 3% on average (season & latitude dependent). The nominal spectral conversion formulae (from Liang and Govaerts) agree well. MODIS BHRs are off when estimated from the backup algorithm.

Africa –Southern Europe

Magnitude inversion January 2001 June 2001

Northern – Eastern Europe

Magnitude inversion January 2001 June 2001

Conclusions and Perspectives Albedo (BHR iso ) comparison reveals very good agreement between MODIS- MISR-Meteosat (high QA) products. Extend the comparison exercise globally. Repeat the exercise for DHRs.