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190028 
Journal Article 
Comparison of coincident Multiangle Imaging Spectroradiometer and Moderate Resolution Imaging Spectroradiometer aerosol optical depths over land and ocean scenes containing Aerosol Robotic Network sites 
Abdou, W; Diner, D; Martonchik, J; Bruegge, C; Kahn, R; Gaitley, B; Crean, K; Remer, L; Holben, B 
2005 
Yes 
Journal of Geophysical Research
ISSN: 0148-0227
EISSN: 2156-2202 
110 
D10 
D10S07 
WOS:000228379000001 
The Multiangle Imaging Spectroradiometer (MISR) and the
Moderate Resolution Imaging Spectroradiometer (MODIS), launched on 18 December 1999 aboard the
Terra spacecraft, are making global observations of top-of-atmosphere (TOA) radiances. Aerosol
optical depths and particle properties are independently retrieved from these radiances using
methodologies and algorithms that make use of the instruments' corresponding designs. This paper
compares instantaneous optical depths retrieved from simultaneous and collocated radiances
measured by the two instruments at locations containing sites within the Aerosol Robotic Network
(AERONET). A set of 318 MISR and MODIS images, obtained during the months of March, June, and
September 2002 at 62 AERONET sites, were used in this study. The results show that over land,
MODIS aerosol optical depths at 470 and 660 nm are larger than those retrieved from MISR by about
35% and 10% on average, respectively, when all land surface types are included in the regression.
The differences decrease when coastal and desert areas are excluded. For optical depths retrieved
over ocean, MISR is on average about 0.1 and 0.05 higher than MODIS in the 470 and 660 nm bands,
respectively. Part of this difference is due to radiometric calibration and is reduced to about
0.01 and 0.03 when recently derived band-to-band adjustments in the MISR radiometry are
incorporated. Comparisons with AERONET data show similar patterns.