Earthdata Forum

Hi,
I wanted to use the aerosol mixing ratio data for dust, black carbon, sea salt, sulfate and organic carbon at 72 pressure levels( dataset: MERRA-2 inst3_3d_aer_Nv: 3d,3-Hourly,Instantaneous,Model-Level,Assimilation,Aerosol Mixing Ratio V5.12.4 (M2I3NVAER)). In the summary, it says the data is available for all of these aerosols. However, the dataset has it only for dust and seasalt. I attempted to access your site on 08/10/2025 2:15pm.
Kindly help.
Regards,
Fathima

The 3D collection M2I3NVAER (https://disc.gsfc.nasa.gov/datasets/M2I3NVAER_5.12.4/summary?keywords=M2I3NVAER_5.12.4) includes the mixing ratio for all five aerosol species, OC, BC, sulfate, dust, and sea salt. Below is a list of variables in this collection:

air_density
Hydrophilic Black Carbon
Hydrophobic Black Carbon
Dimethylsulphide
Dust Mixing Ratio (bin 001)
Dust Mixing Ratio (bin 002)
Dust Mixing Ratio (bin 003)
Dust Mixing Ratio (bin 004)
Dust Mixing Ratio (bin 005)
Methanesulphonic acid
Hydrophilic Organic Carbon (Particulate Matter)
Hydrophobic Organic Carbon (Particulate Matter)
relative_humidity_after_moist
Sulphur dioxide
Sulphate aerosol
Sea Salt Mixing Ratio (bin 001)
Sea Salt Mixing Ratio (bin 002)
Sea Salt Mixing Ratio (bin 003)
Sea Salt Mixing Ratio (bin 004)
Sea Salt Mixing Ratio (bin 005)
pressure_thickness

Find the FAQ to calculate PM1 and PM10 at https://gmao.gsfc.nasa.gov/gmao-products/merra-2/faq_merra-2/