In this study, a notable point of examination is the comparison between the data from the periods pre-EOS and post-EOS around the year 2000. During this period, changes were made to the way satellite aerosol observations were used in the assimilation system. By analyzing these distinct temporal segments, the research seeks to discern any consequential shifts or variations in air quality dynamics, particularly related to the changes in input satellite aerosol observations.
The NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) is responsible for preserving MERRA-2 data and offering a range of data services tailored to users' diverse requirements. These services encompass tasks like selecting specific portions of data, online visualization, and analysis, accessing long time series data, and delivering online tutorials. This presentation will showcase how to effectively use these data tools and services.
The image illustrates the log10-scale total surface PM2.5 concentration averaged over 20 years from 2003 to 2022. This visualization was generated using Giovanni, an online tool available at GES DISC.

