Environmental Engineering Reference
In-Depth Information
3. Questions and Answers
S. Andreani-Aksoyoglu:
Why did you choose Chaumont station which is an
elevated site? There are many more stations where measurements are available.
Answer:
We selected a few EMEP stations for the first validation study with
respect to the availability of data covering full decade 1991-2000 for most
pollutants. Some of them are elevated sites which can bring different behavior
of values measured, however, even for higher altitudes the validation makes
sense. We are including more stations into the comparison subsequently.
D. Yin:
Did you consider changes of green-house-gases and land-use in A1B (that
are in GCM simulations) when you downscaled ERA40 using RegCM?
Answer:
The changes of CO
2
are considered in climate simulation, but the
emissions of antropogenic pollutants (ozone precursors) are kept constant at
year 2000 level to see just the effect of climate change. Similarly, there are no
changes of land-use included as well. However, the biogenic emissions are
changing as depending on climate variables.
G. Kallos:
What is the extra information you recovered from your exercise that is
not already in the ECHAM runs? Your domains simply are influenced by the
lateral boundary conditions of ECHAM so you just simply modify the ECHAM
results by utilizing local emissions.
Answer:
That is what we aim when doing dynamical downscaling. Sure, it is
expected to have the results strongly driven by global model (or driving one in
case of multiple nesting) including long range transport, but the purpose is to
get local features imposed by local higher resolution emission data and, of
course, high resolution topography and land-use effects, which can be seen in
our simulations.
