GEO CHEM model

GOME Comparison with the GEOS-CHEM model. /. Geophys. Res., 111(D02308), doi 10.1029/200 5JD006 564, 1-17. 

The basis of the chemistry included in the GEOS-Chem model (Bey et al., 1999) was described by Horowitz et al. (1998). The mechanism includes explicit chemistry for methane, ethane, propane, butane, propene, and isoprene. Butane is used as a surrogate for all alkanes with carbon number > 4 and propene for alkenes > 3. This approach is based on the similarities in the yields per carbon atom of O3, HOjt (OH, HO2, RO2) and peroxyacyl nitrates for these compound classes, as discussed by Jacob et al. (1989). Three peroxyacyl nitrates PAN, PPN (a lumped peroxyacyl nitrate) and PMN (peroxymethacryloyl nitrate) are included, together with ISN2, a lumped organic hydroxynitrate, required for the isoprene mechanism and R4N2, a lumped alkyl nitrate. Seven carbonyl species are included formaldehyde, acetaldehyde, methacrolein, other aldehydes (RCHO), acetone, methylvinyl ketone, and other ketones (MEK). 

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