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The various attributes are explained in more detail in the Base Emissions and Scale Factors sections.Īs described in the Data Collections section, all of the files contained between the brackets (((MACCITY and )))MACCITY will be read if you set the switch # ScalID Name srcFile srcVar srcTime CRE Dim Unit Operġ HOURLY_SCALFACT $ROOT/hourly.nc factor /0-23Ĝ xy 1 1 # ExtNr Name sourceFile sourceVar sourceTime C/R/E SrcDim SrcUnit Species ScalIDs Cat HierĠ MACCITY_CO $ROOT/MACCity.nc CO 1980-2014/1-12/1/0 C xy kg/m2/s CO 1 1 1 If run standalone, the grid specification and desired datetimes need be specified as described in the Interfaces section. If HEMCO is coupled to GEOS-Chem, these values are taken from the chemistry model. The horizontal grid and simulation datetimes employed by HEMCO depends on the HEMCO-model interface. The following configuration file then simulates CO emissions with gridded hourly scale factors applied to it (the latter taken from variable 'factor' of file hourly.nc). Suppose monthly anthropogenic CO emissions from the MACCity inventory ( Lamarque et al., 2010) are stored in file MACCity.nc as variable 'CO'. Modification of the HEMCO source code (and recompilation) is only required if new extensions are added, or to use HEMCO in a new model environent (see sections Behind the scenes of HEMCO and Interfaces).Įxample 1: Adding MACCITY global anthropogenic emissions You will also want to look at our HEMCO examples wiki page, which contains examples on how you can customize HEMCO for your particular emission scenarios.Īll emission calculation settings are specified in the HEMCO configuration file.
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On that page you will also find instructions on how to download these data to your disk server.
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The full suite of emission inventories and extensions used by the chemical transport model GEOS-Chem are described on our HEMCO data directories wiki page. It calculates emissions of carbon monoxide (CO) from the EDGAR inventory ( Janssens-Maenhout et al., 2010) on Januon a global grid of 4x5 degrees.
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HEMCO includes a simple example of a HEMCO standalone simulation. HEMCO is already included in the standard distribution of GEOS-Chem v10-01 and later versions ( ). To couple HEMCO to an atmospheric model, some working experience with FORTRAN is also required.
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Some basic knowledge of a Unix operating system is expected. Installation instructions are provided on the same page. HEMCO is a collection of FORTRAN-90 routines that are freely available at. A more detailed description of HEMCO is given in Keller et al. It is included in GEOS-Chem v10-01 and later versions. HEMCO can be run in standalone mode or coupled to an atmospheric model. Emissions that depend on environmental variables and non-linear parameterizations are calculated in separate HEMCO extensions.
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It can combine, overlay, and update a set of data inventories (base emissions) and scale factors, as specified by the user through the HEMCO configuration file.
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The Harvard-NASA Emissions Component (HEMCO) is a software component for computing atmospheric emissions from different sources, regions, and species on a user-defined grid.