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In contrast to the passive remote sensing of global CO 2 column concentrations (XCO 2 ), active remote sensing with a lidar enables continuous XCO 2 measurements throughout the entire atmosphere in daytime and nighttime. The lidar could penetrate most cirrus and is almost unaffected by aerosols. Atmospheric environment monitoring satellite (AEMS, also named DQ-1) aerosol and carbon dioxide detection Lidar (ACDL) is a novel spaceborne lidar that implements a 1572 nm integrated path differential absorption (IPDA) method to measure the global XCO 2 for the first time. In this study, special methods have been developed for ACDL data processing and XCO 2 retrieval. The CO 2 measurement data products of ACDL, including the differential absorption optical depth between the online and offline wavelengths, the integral weighting function, and XCO 2 , are presented. The results of XCO 2 measurements over the period from 1 st June 2022 to 30 th June 2022 (first month data of ACDL) are analyzed to demonstrate the measurement capabilities of the spaceborne ACDL system.
Fan et al. (Mon,) studied this question.