Abstract
Abstract. We present a comparison of 1064 nm aerosol optical depth (AOD) and aerosol
extinction profiles from the Cloud-Aerosol Transport System (CATS) level 2
aerosol product with collocated Aerosol Robotic Network (AERONET) AOD, Moderate Imaging Spectroradiometer (MODIS) Aqua
and Terra Dark Target AOD and
Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) AOD and extinction
data for the period of March 2015–October 2017. Upon quality-assurance checks of
CATS data, reasonable agreement is found between aerosol data from CATS and
other sensors. Using quality-assured CATS aerosol data, for the first time,
variations in AODs and aerosol extinction profiles are evaluated at 00:00, 06:00,
12:00 and 18:00 UTC (and/or 00:00, 06:00, 12:00 and 18:00 local time or LT) on both regional and global scales. This study suggests that marginal
variations are found in AOD from a global mean perspective, with the minimum
aerosol extinction values found at 18:00 LT near the surface
layer for global oceans, for both the June–November and December–May
seasons. Over land, below 500 m, the daily minimum and maximum aerosol
extinction values are found at 12:00 and 00:00/06:00 LT,
respectively. Strong diurnal variations are also found over north Africa, the Middle East and
India for the December–May season, and over north Africa, south Africa,
the Middle East and India for the June–November season.
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