Title: "Towards a unified Aerosol Climatology: Comparing MODIS and MISR and AVHRR products"

Global Aerosol Climatology Project dataset of aerosol optical thickness
(AOT) and Angstrom exponent covers a period of over 25 years and has
recently been expanded to include the NOAA-18 AVHRR data. The
length of the dataset as well as the recent discovery of a
possible downward AOT trend make it important to compare
contemporaneous GACP data with the data from more advanced
satellite instruments such as MODIS and MISR. In this
presentation we  extend our previous global and regional scale
comparisons of MODIS, MISR, and GACP datasets using the most
recent satellite data products. We also perform a pixel-level
comparison in an effort to identify the reasons for the observed
discrepancies. It is hoped that this work will improve our
understanding of the strengths and limitations of aerosol remote
sensing and will lead to an improved long-term aerosol
climatological record.