Sec34 emissions

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The emission data required by UKCA are currently (vn7.7) handled through the UM ancillary system as 'User defined' items. This puts a limitation on the number of emission species. With the addition of chemistry schemes and enhancement UKCA itself, there is likely to be an increase in the number as well as complexity (vertical/time profiles, source-wise grouping, ..) of the emissions. Shifting these to Section 34 will give more flexibility in handling under UKCA. This process was actually initiated a while ago and a few 'reservations' for the emission items were already made in Section 34 as well as the UM ancillary system.

The Table below lists the available emission species and their requirement for the current and near future chemistry schemes.