Intercomparison of CALIOP and MODIS aerosol optical depth retrievals

C. Kittaka, D. M. Winker, M. A. Vaughan, A. Omar, L. A. Remer
2010 Atmospheric Measurement Techniques Discussions  
The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) is carried on the CALIPSO satellite and has acquired global aerosol profiles since June 2006. CALIPSO is flown in formation with the Aqua satellite as part of the A-train satellite constellation, so that a large number of coincident aerosol observations are available from CALIOP 5 and the MODIS-Aqua instrument. This study compares column aerosol optical depth at 0.532 µm derived from CALIOP aerosol profiles with MODIS-Aqua 0.55 µm
more » ... osol optical depth over the period June 2006 through August 2008. The study is based on the CALIOP Version 2 Aerosol Layer Product and MODIS Collection 5. While CALIOP is first and foremost a profiling instrument, this comparison of column aerosol optical 10 depth provides insight into quality of CALIOP aerosol data. It is found that daytime aerosol optical depth from the CALIOP Version 2 product has a small global mean bias relative to MODIS Collection 5. Regional biases, of both signs, are larger and biases are seen to vary somewhat with season. In northern mid-latitudes, aerosol optical depth from CALIOP is lower, on average, than from MODIS. This may be partly due to 15 a latitude-dependent calibration error in Version 2 CALIOP Level 1 daytime 0.532 µm profiles. This comparison of CALIOP and MODIS also provides insight into possible biases in the MODIS aerosol optical depth product due to cloud masking and errors in modeling land surface reflectance. Intercomparison of CALIOP and MODIS aerosol optical depth retrievals C. Kittaka et al. Title Page Abstract AMTD 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010 Abstract 3, 3319-3344, 2010 Abstract 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010 Abstract 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010 Abstract AMTD 3, 3319-3344, 2010
doi:10.5194/amtd-3-3319-2010 fatcat:fqzhwtuikvfiddnhpksilsaojq