Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3419802j&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 19, CiteID L19802
Physics
9
Biogeosciences: Remote Sensing, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Geochemistry: Composition Of Aerosols And Dust Particles
Scientific paper
The second-generation MODIS aerosol retrieval (Collection 005) from EOS- Aqua (2002-2005) was evaluated using ground-based AERONET measurements at Kanpur (26.45°N, 80.35°E) northern India. We found that the aerosol optical depth (AOD) retrievals are more accurate compared to that of previous retrieval (Collection 004). About 70% of the total retrievals at 0.47 μm and 0.55 μm and 60% of the retrievals at 0.66 μm wavelength in the new version fall within the pre-launch uncertainty (Δτ = +/-0.05 +/- 0.15τ, where τ is AOD) with better correlation (R2 ~ 0.83) at all three wavelengths. However, MODIS still tends to over-estimate AOD for a few retrievals in the presence of dust aerosols. The error in the fine-dominated AOD was large for most retrievals in the C005. However, the fine-dominated AOD of Collection 004 was better correlated with the equivalent AERONET data. This suggests that the fine-dominated AOD retrievals need to be re-examined further.
Jethva Hiren
Satheesh S. K.
Srinivasan J.
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