IMERG V07 Release Notes
The algorithm for the Integrated Multi-satellitE Retrievals for GPM (IMERG) has now been upgraded to Version 07. IMERG V07 involves a wide range of changes to all aspects of the algorithm, many of which are implemented in response to feedback on V06, which was the first time the IMERG record spanned the TRMM-GPM eras. IMERG V07 is being reprocessed for the entire TRMM-GPM record and thus supersedes all prior IMERG versions, as well as superseding the prior TRMM-based TMPA products (3B42, 3B43).
Retrospective Processing for the Final Run began on 1 July 2023 and completed on 30 August 2023. However, discovery of some 238 orbits of defective GPROF precipitation estimates across all passive microwave satellites over the TRMM and GPM eras led to a second retrospective processing for the V07 Final Run. The relatively long pause between the first Final Run retrospective processing and this second is partly due to an orbit boost that the GPM Core Observatory (GPM-CO) satellite performed on 7-8 November 2023. When this completes for the entire TRMM-GPM record, climatological calibrations will be computed for the Early and Late Runs, and both Initial Processing and Retrospective Processing for the Early and Late Runs will begin. This is expected to occur during November 2023 – February 2024. Links to the IMERG files are listed on the Data Directory of the GPM website: https://gpm.nasa.gov/data/directory, which point to archives hosted at the Goddard Earth Sciences Data and Information Services Center (GES DISC) https://disc.gsfc.nasa.gov/datasets?keywords=gpm%20imerg%2007 and the Precipitation Processing System (PPS) https://arthurhou.pps.eosdis.nasa.gov/Documents/Master_List_of_PPS_Data_Products.html, as well as several interactive sites. Please visit https://gpm.nasa.gov/data/news for the latest updates.