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RIVM report 773301 001 / NRP report 410200 051 page 79 of 142
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Time profiles are distributions to describe the monthly, daily, and sometimes also weekly variation in
annual emissions to account for seasonality and diurnal variation as well as the weekly rhythm of
working and recreational hours. These are often required for atmospheric modellers as input into their
models. In general, likewise increasing spatial resolution from global to regional to country to grid
emissions, increasing temporal resolution from annual emissions to monthly to weekly to daily
variation also increases the uncertainty in the estimates. Here the distinction can be made between
FKDUDFWHULVWLF temporal variation which is a kind of ‘multi-year average’ and temporal variation in a
specific time interval, so-called HSLVRGLF variation. From comments by the atmospheric modelling
community it appears that for global modelling, at which the global inventories specifically aim,
seasonality is the most important time aspect to consider. It depends on the type of model whether
they need characteristic of episodic time profiles. It should be stressed, however, that anthropogenic
emissions show much less temporal variation compared to natural emissions which are often strongly
dependent on weather factors. In Table 4.13 the priority setting for compiling time profiles is
summarised per source category in relation with their contribution to total emissions of specific
compounds.
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