Hourly data for 50x50km squares are available at :
https://disc.sci.gsfc.nasa.gov/datasets/M2I1NXASM_V5.12.4/summary?keywords=%22MERRA-2%22
the following parameters are provided (https://gmao.gsfc.nasa.gov/pubs/docs/Bosilovich785.pdf) :
Here is an illustration of the O3 and PWV content around CTIO (2°x2°) during the first 20 day of october 2017 (last run was from 1st to 10):
Taken from ascii files processed with merra2.py
Drawing Weather map
from : merra2NC.py
Aerosol Optical Depth in Merra-2 data:
