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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.
Highlights
Aerosol measurement through the Sun-synchronous orbits of Terra and Aqua by nature encourages a larger-scale daily average point of view
Using 2 years of observations from Cloud-Aerosol Transport System (CATS), in this paper, we focus on understanding of the following questions: how well do CATS-derived aerosol optical depth (AOD) and aerosol vertical distributions compare with aerosol properties derived from other ground-based and satellite observations such as Aerosol Robotic Network (AERONET), Moderate Imaging Spectroradiometer (MODIS) and CloudAerosol Lidar with Orthogonal Polarization (CALIOP)? Do differences exhibit a diurnal cycle? What are the diurnal variations of aerosol optical depth on a global domain? What are the diurnal variations of aerosol vertical distribution on both regional and global scales?
In this subsection, the performance of over-land and over-ocean CATS AOD retrievals is compared against AERONET and C6.1 over-ocean MODIS Dark Target (DT) aerosol products
Summary
Aerosol measurement through the Sun-synchronous orbits of Terra and Aqua by nature encourages a larger-scale daily average point of view. Sun-synchronous passive satellite aerosol observations from the solar spectrum only provide a small sampling of the full diurnal cycle. For a given location within ±51.6◦ (latitude), after aggregating roughly 60 d of data, a near-full diurnal cycle of aerosol and cloud properties can be obtained from CATS observations (Yorks et al, 2016). This provides a new opportunity for studying diurnal variations (day and night) in aerosol vertical distributions from space observations. Using 2 years of observations from CATS, in this paper, we focus on understanding of the following questions: how well do CATS-derived aerosol optical depth (AOD) and aerosol vertical distributions compare with aerosol properties derived from other ground-based and satellite observations such as AERONET, MODIS and CALIOP? Do differences exhibit a diurnal cycle? What are the diurnal variations of aerosol optical depth on a global domain? What are the diurnal variations of aerosol vertical distribution on both regional and global scales?
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