README -- Describes contents of the HEMCO/CMIP6/v2019-09 directory 18 Dec 2019 GEOS-Chem Support Team geos-chem-support@g.harvard.edu Overview: =============================================================================== This directory contains reprocessed NetCDF files of spatially and temporally resolved concentrations from CMIP6 [Meinshausen et al 2017]. These files have been processed for use in GEOS-Chem from the original latitudinally-resolved data hosted by the university of Melbourne. This processing has made the files COARDS compliant, expanded concentrations across all longitudes, and sub-selected the years 1750-2014. These files are used by GEOS-Chem/HEMCO to fix concentrations of certain long-lived species in the planetary boundary layer. Please contact Tomas Sherwen (tomas.sherwen@york.ac.uk) with any questions or to report any issues about files. source: http://www.climatecollege.unimelb.edu.au/cmip6 2x2.5 files were created in addition to the native resolution files for use with older versions of MAPL/ESMF models (GCHP, GEOS) that put restrictions on input file resolution relative to model resolution. Further processing by the GEOS-Chem Support Team: =============================================================================== NOTE: Bob Yantosca (yantosca@seas.harvard.edu) used the following bash scripts to post-process the original data: (1) scripts/split_data_by_years.py: - Splits the original CMIP6 data files into one file per year containing all species) for each year from 1750..2014. Having one file per year with all species minimizes the number of file open/close operations. (2) scripts/post_process_data.sh: - Post-processes the data files created by Python script split_data_by_years.py. Edits variable attributes for COARDS compliance, compresses and chunks each file, and sets the proper permissions. File List: =============================================================================== CMIP6_GHG_surface_VMR_YYYY.nc - CMIP6 concentrations (lat,time) for years YYYY = 1750..2014 for species CH2Cl2, CH3Cl, CHCL3, CH3Br, and CH4. There is one file per year containing all of the above-mentioned species References: =============================================================================== Meinshausen, M., Vogel, E., Nauels, A., Lorbacher, K., Meinshausen, N., Etheridge, D. M., Fraser, P. J., Montzka, S. A., Rayner, P. J., Trudinger, C. M., Krummel, P. B., Beyerle, U., Canadell, J. G., Daniel, J. S., Enting, I. G., Law, R. M., Lunder, C. R., O'Doherty, S., Prinn, R. G., Reimann, S., Rubino, M., Velders, G. J. M., Vollmer, M. K., Wang, R. H. J., and Weiss, R.: Historical greenhouse gas concentrations for climate modelling (CMIP6), Geosci. Model Dev., 10, 2057–2116, https://doi.org/10.5194/gmd-10-2057-2017, 2017.