Investigation of CATS Aerosol Products and Application Toward Global Diurnal Variation of Aerosols
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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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 0000, 0600, 1200 and 1800 UTC andor 0000, 0600, 1200 and 1800 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 1800 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 1200 and 00000600LT, 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.
- Physical Chemistry