README -- Describes contents of HEMCO/MEGAN/v2018-05
11 Mar 2019
GEOS-Chem Support Team
geos-chem-support@g.harvard.edu

Overview:
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This directory contains one the input files for the HEMCO MEGAN2.1 extension.
The original file is in the v2018-05 directory but contained a time unit string
incompatible with the MAPL library used in GCHP. The time units must be format
00:00:00, but the file contained 00:00:0.0. Please see the README in v2018-05
for more information about this file.

Files:
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NOTE: GCST rechunked and compressed the netcdf files after receiving them

MEGAN2.1_EF.geos.025x03125.nc

 -- Annual emission factor (AEF) data from the MEGAN 2.1 inventory for the 
    various biogenic hydrocarbon species:

    ALPHA_PINENE, BETA_PINENE, CARENE,  ISOPRENE, LIMONENE,      
    MBO,          MYRCENE      OCIMENE, SABINENE, ACETONE

    These files were converted to netCDF from the original bpch files
    created by Dylan Millet.
 
    Resolution  : GEOS-Chem 0.25 x 0.3125 grid (1152 x 721 boxes)
    Units       : kg carbon m-2 s-1
    Timestamps  : 1985/01
    Compression : Level 1 (e.g. nccopy -d1)
    Chunking    : nccopy -c lon/1152,lat/721,time/1

References:
===============================================================================

Please see this wiki page for references pertaining to the MEGAN emissions:

http://wiki.geos-chem.org/MEGAN_v2.1_plus_Guenther_2012_biogenic_emissions#References