RIVM report xxxxxx xxx
RIVM report xxxxxx xxx
RIVM report xxxxxx xxx
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<strong>RIVM</strong> <strong>report</strong> 773301 001 / NRP <strong>report</strong> 410200 051 page 97 of 142<br />
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As part of the project, available information on time profiles of anthropogenic sources was collected and<br />
listed, focussing on their monthly variation. Within GEIA, however, a full study of time profiles for all<br />
sources is in progress. The present activities of the EDGAR will feed into this larger study.<br />
Time profiles can be defined on different temporal scales, e.g. seasonal or monthly variation,<br />
weekly patterns, or diurnal cycles. Often as a first approximation modellers distinguish natural sources<br />
from anthropogenic sources, since natural sources often depend strongly on climate, soil or water<br />
characteristics and thereby show a strong temporal variation, in seasonality, diurnal cycle or both. Thus,<br />
natural sources often have a distinctly other character than have anthropogenic sources. In particular with<br />
respect to seasonality, modellers often consider anthropogenic sources to be uniform in time. Surely this<br />
is the case when compared to natural sources. However, when taking a closer look at the scattered<br />
literature on this subject a more detailed picture shows up, also for seasonal variation of emission<br />
sources. Seasonal variation in weather and different climate conditions gives rise to different profiles for<br />
fuel combustion for space heating and for biomass burning, whereas cultural differences show up in<br />
statistics of industrial production and transportation.<br />
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