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The MOPITT/NCAR team announces the release of Version 9 (V9) Level 2 and Level 3 retrieval products for carbon monoxide (CO) for the years 2000 to 2020. Separate products are available for Thermal-Infrared only (TIR-only), Near-Infrared only (NIR-only) and Joint (TIR-NIR) retrievals. For V9, revisions to the cloud detection algorithm yield substantially improved retrieval coverage for observations over land. The improved coverage should especially benefit studies of (1) regions with persistent clouds and (2) regions commonly affected by severe pollution (with large values of aerosol optical depth). Details of the revised algorithm and supporting case studies are described in Deeter et al., ‘Impacts of MOPITT cloud detection revisions on observation frequency and mapping of highly polluted scenes’, Remote Sens. Env., vol. 262, https://doi.org/10.1016/j.rse.2021.112516, 2021. V9 products also benefit from an improved calibration strategy for MOPITT’s NIR channels. The new NIR calibration strategy results in significantly reduced retrieval bias drift for NIR-only products between annual calibration events.
*MOPITT V109 beta products will be released as received