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BELMANIP: Benchmark Land Multisite Analysis and Intercomparison of Products

BELMANIP: Benchmark Land Multisite Analysis and Intercomparison of Products. F. Baret, J. Morissette, R. Fernandes, J.L. Champeaux, R. Myneni, J. Chen, S. Plummer, M. Weiss, C. Bacour. Motivations.

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BELMANIP: Benchmark Land Multisite Analysis and Intercomparison of Products

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  1. BELMANIP:Benchmark Land Multisite Analysis and Intercomparison of Products F. Baret, J. Morissette, R. Fernandes, J.L. Champeaux, R. Myneni, J. Chen, S. Plummer, M. Weiss, C. Bacour

  2. Motivations The validation of biophysical products (LAI, fAPAR, fCover, albedo, …) derived from medium resolution senors could be achieved by: • direct comparison to ground measurements : absolute validation such as VALERI, MODLAND, BIGFOOT, CCRS, BSNR… • but requires important efforts • therefore only few sites available • Representativeness of the sites (time/space) • Inter-comparison of products (algorithms, sensors) • Does not require ground measurements and therefore allow to include a larger number of sites for a better temporal and spatial representativeness • Requires a global coordination under CEOS for better efficiency • Propose a network of sites covering the whole earth surface and representing the several surface types and conditions • Propose a common period for intercomparison • Propose a standard format for cross comparison between products • Propose a mechanism to share products extracts EGU-Vienna 28/04/2005

  3. Objectives • Evaluate the representativeness of absolute validation sites • Propose a network of sites for indirect evaluation: BELMANIP • Inter-comparaison, • Temporal consistency • Internal consistency of products (LAI/albedo/fAPAR, …) Representativeness based on ECOCLIMAP classification/climatology EGU-Vienna 28/04/2005

  4. Outlook • ECOCLIMAP: brief presentation • Main statistics from ECOCLIMAP • Representativeness of direct validation sites • Building up BELMANIP network • FLUXNET • AERONET • COMPLET • Conclusion EGU-Vienna 28/04/2005

  5. ECOCLIMAP V. Masson, J. L. Champeaux, F. Chauvin, C. Meriguer, and R. Lacaze, "A global database of land surface parameters at 1km resolution in meteorological and climate models," Journal of Climate, 2003. 16 climate types (Koeppe & De Long, 1958) 15 biomes (cover map DCW, IGBP, CORINE, PELCOM) 218 classes used including 90 for Europe (CORINE) and 128 pour le remaining world 1/120° resolution (about 1km at the equator) EGU-Vienna 28/04/2005

  6. Statistics derived from ECOCLIMAP Map of the 7 dominant surface types Latitudinal distribution LAI distribution Heterogeneity of LAI EGU-Vienna 28/04/2005

  7. Map of dominant components The initial 15 surface types were grouped into 7 components Map of the dominant surface types at 1° 1° resolution EGU-Vienna 28/04/2005

  8. Latitudinal Distribution 10° de résolution en latitude 1° de résolution in latitude (/global area) (/emerged area) Importance of northern mid latitudes Importance of ‘grass’ et deserts EGU-Vienna 28/04/2005

  9. Annual average LAI map Large variability within a each of the 7 surface types EGU-Vienna 28/04/2005

  10. Statistical distribution of LAI LAI min LAI moy LAI max =Maximal annual value EGU-Vienna 28/04/2005

  11. Seasonality (only continental surfaces) Latitude Time (Month) LAI EGU-Vienna 28/04/2005

  12. Representativeness of direct validation sites (DIRECT) • VALERI (27) • CCRS (27) • BIGFOOT (9) • Others (35) • TOTAL=100 DIRECT GLOBAL EGU-Vienna 28/04/2005

  13. Distribution of LAI for ‘DIRECT’ GLOBAL DIRECT Distribution of components Average LAI values (without bare surfaces) EGU-Vienna 28/04/2005

  14. Improving representativeness: BELMANIP • Use of additional networks • FLUXNET • AERONET • Eliminating replicates and sites with water >25% @ 88 km² • Evaluation of the representativeness • Adding sites to improve representativeness • Surface types • Latitudinal distribution • Longitudinal distribution LAI EGU-Vienna 28/04/2005

  15. BELMANIP 100 DIRECT + 218 FLUXNET + 58 AERONET + 78 COMPLET= 377 BELMANIP EGU-Vienna 28/04/2005

  16. Latitudinale and surface types distribution GLOBAL BELMANIP EGU-Vienna 28/04/2005

  17. LAI distribution BELMANIP Global EGU-Vienna 28/04/2005

  18. CONCLUSION • Proposal for intercomparison network • Consensus between ‘producers’ to extract the BELMANIP sites • 5050 km² area • over 2003 • share the extracts to improve efficiency • Possible (annual) update of the network to account for new DIRECT sites EGU-Vienna 28/04/2005

  19. Example over one BELMANIP site MERIS MODIS CYCLOPES V1 ECOCLIMAP EGU-Vienna 28/04/2005

  20. Example: internal consistencyLAI/fAPAR relationships EGU-Vienna 28/04/2005

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