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MODIS Atmosphere Group Summary

This summary provides an overview of the latest improvements in MODIS Collection 5 atmospheric data, including enhanced cloud and aerosol products, improved water vapor algorithms, and upcoming Collection 6 enhancements. It covers data reprocessing for Terra and Aqua, delivery timelines, and new applications of MODIS data. The post also highlights the transition to Collection 6, with targeted improvements in aerosol products and surface reflectance refinements based on the Deep Blue Algorithm.

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MODIS Atmosphere Group Summary

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  1. MODIS Atmosphere Group Summary • Collection 5 Status • Data Use/Validation Investigations • 20 presentations • New uses of MODIS data

  2. Collection 5 Production Updates • All Level-2 Software has been delivered to SDST/MODAPS • Summary of modifications and enhancements in collection 5 (mostly covered in posters) • Major enhancements in cloud mask (especially nighttime and polar regions) • Cloud product uses new ice crystal libraries, better phase determination, atmosphere/land surface reflectance product, improved atmospheric correction, uncertainties in cloud optical properties • Aerosol product uses new spatial variability to improve screening of heavy aerosol and clouds, better regional characterization of aerosol optical properties • Water vapor over high dry regions, like Tibet, improved in near-infrared algorithm • All level-2 products are currently in reprocessing for Terra • Over 1 year of products available thus far; distributed through AADS • Level-3 Software delivery expected in late January • All level-3 production will be conducted for level-2 products produced thus far

  3. Collection 5 Production Updates • Once Level-3 data production catches up with level-2, collection 5 data will be distributed to Goddard DAAC as well as available through AADS • Aqua reprocessing to commence around March 1 • Atmosphere collection 5 products completed for Terra and Aqua around August 31 • Collection 6 improvements planned and under development • Improvements in aerosol product for bright reflecting surfaces • Deep blue algorithm as well as further surface reflectance refinements

  4. MODIS Deep Blue Algorithm over the Middle East(N. C. Hsu , S. C. Tsay, M. D. King – NASA GSFC) August 7, 2005 True Color Composite (0.65, 0.56, 0.47) Aerosol Optical Thickness Syria Iran Iraq Saudi Arabia Persian Gulf 0.0 0.5 1.0 1.5 2.0 2.5 Aerosol Optical Thickness

  5. Spatially Complete Spectral Albedo Maps(E. G. Moody, M. D. King, S. Platnick, C. B. Schaaf, F. Gao – GSFC, BU) Moody et al. (2005) Moody et al. (2005)

  6. MERIS vs MODIS gap-filled albedo for common bands (16-day, DoY=257-272) at 0.05º resolution 490 vs 470 665 vs 665 865 vs 869 • 2D correlation improves with increasing wavelength

  7. Northern Hemisphere Spectral Snow Albedo(E. G. Moody, M. D. King, C. B. Schaaf, D. K. Hall – GSFC, BU) 2000-2004

  8. Probability Density of Atmospheric Properties(M. Jin and M. D. King, Univ. Maryland, GSFC) 2000-2004 Cloud Optical Thickness Precipitable Water

  9. Miscellaneous Updates • MODIS polar winds • Used operationally by NCEP, ECMWF, GMAO, … • Ghassem Asrar • Today is his last day at NASA • Moving to ARS as Deputy Administrator

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