See Brief request syntax to understand each keyword.
MACC Reanalysis Surface
Total aerosol optical depth August 2012.
ECMWF Public Dataset web interface
#!/usr/bin/env python from ecmwfapi import ECMWFDataServer server = ECMWFDataServer() server.retrieve({ 'stream' : "oper", 'levtype' : "sfc", 'expver' : "rean", 'dataset' : "macc", 'step' : "0", 'grid' : "0.75/0.75", 'param' : "207.210", 'time' : "00", 'step' : "3/6/9/12/15/18/21/24", 'date' : "2012-08-01/to/2012-08-31", 'type' : "fc", 'class' : "mc", 'target' : "macc_aod_2012-08-01to2012-08-31_00061218.grib" })
MACC Reanalysis Model Levels
Carbon monoxide, August 2012, steps 6, 12, 18, 24 all levelist.