Environmental Engineering Reference
In-Depth Information
5. Questions and Answers
Douw Steyn:
We usually consider discrete fields that are constant in time (for the
interpolation). Indeed we should not ignore the temporal variation.
Answer:
Though it is possible to include the temporal dimension into interpolations
we do not do this, and since we are looking for trends in time we do not see the
advantage of this either.
S.T. Rao:
Do you see any indication for differences in the trend (observed
compared to emissions).
Answer:
The trend in reported ozone precursor emissions is negative, on average
in Europe, which is not found in the observations, on average. SO
2
emission
trends reflect the trends in concentrations, at least qualitatively if not exactly
quantitatively.
Question:
Is there consistency in what the world is seeing.
Answer:
Not in the case of ozone, and also not generally for PM.
Peter Builtjes:
Emissions are claimed to be reduced, but reality may not yet
substantiate this.
