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Assessment of second-generation MODIS aerosol retrieval (Collection 005) at Kanpur, India

Jethva, Hiren and Satheesh, SK and Srinivasan, J (2007) Assessment of second-generation MODIS aerosol retrieval (Collection 005) at Kanpur, India. In: Geophysical Research Letters, 34 (L19802). pp. 1-5.

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The second-generation MODIS aerosol retrieval (Collection 005) from EOS- Aqua (2002–2005) was evaluated using ground-based AERONET measurements at Kanpur $(26.45 ^\circ N, 80.35^ \circ E)$ 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 \mu m and 0.55 \mu m and 60\% of the retrievals at 0.66 \mu m wavelength in the new version fall within the pre-launch uncertainty (\Delta \tau = \pm 0.05 \pm 0.15 \tau, where \tau is AOD) with better correlation $(R^2 \sim 0.83)$ 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.

Item Type: Journal Article
Publication: Geophysical Research Letters
Publisher: American Geophysical Union.
Additional Information: Copyright of this article belongs to American Geophysical Union.
Keywords: Remote sensing;Aerosol;Fine mode fraction;
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 10 Dec 2007
Last Modified: 08 Feb 2012 06:06
URI: http://eprints.iisc.ac.in/id/eprint/12486

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