ACDL_totalXCO2_Release_L3_WHU_v1.0(2022.06-2024.12,Daily,0.5°×0.5°,nc)

The Aerosol and Carbon Dioxide Lidar (ACDL) onboard the DaQi-1 (DQ-1) satellite is the world's first spaceborne lidar for active detection of carbon dioxide and aerosols, and it is also the first satellite payload capable of observing XCO2 in nighttime and winter high-latitude regions. This dataset provides the global daily mean total-column XCO2 product retrieved from ACDL, covering the period from June 2022 to December 2024. This product is divided into the ascending pass and descending pass observations and presented as daily 0.5° × 0.5° gridded data. The file name suffix ("Asc" or "Desc") indicates the ascending or descending orbit. In addition, this L3 product only includes the relatively good observations of which QAflag=1 and 5, so this dataset no longer includes QAflag separately. In particularly, this dataset includes the WF profile at the mean observation location of each 0.5° cell, which is significant for flux inversion. In addition, the MATLAB code for deriving the "true" ACDL XCO2 value from TCCON prior profiles has also been uploaded. The "true" value of ACDL XCO2 calculated by this code can compare with the ACDL measurements for validating the accuracy of this XCO2 product.