GMI Simulations Intro

 

 

GMI simulations with different chemical mechanisms (strat-trop, aerosol, tracers, etc.) are available via anonymous ftp to Index of /datashare/dirac/gmidata2/users (nasa.gov).  Most simulations since 2010 have been ‘Hindcasts’, that is, simulations of the recent past using reanalysis meteorology. 

Descriptions of all simulations and how to obtain them can be found on the Simulations pages. They are grouped by our most recent (MERRA2 Hindcasts), simulations from ~2010-2015 (MERRA Hindcasts), and everything that came before (pre-MERRA Simulations). NASA Modeling Guru website has additional detailed information on these simulations. Go to NASA Modeling Guru: Community: GMI

To find out about variables saved and types of output files, see the GMI Production Output guide NASA Modeling Guru: GMI Production Output Guide. Eight constituent output file types are described in this guide. Outputs are saved at various frequencies including daily instantaneous, monthly average, daily column, and daily satellite overpass times. Other outputs, such as rates for thermal and photolytic reactions, fluxes, and tendencies, are also available. The linux command ncdump –h filename is useful for peeking inside the file to see all variable names and types.

To find the list of stations for which output is written, see GMI Stations list at NASA Modeling Guru: GMI Stations (latest). Hourly output from the more than 300 stations saved is concatenated into single *profile.nc file located in the ‘stations’ subdirectory, directly under each simulation’s main directory (see the Summary of Production Runs for experiment directories).