Environmental Engineering Reference
In-Depth Information
Fig. 2.
The modeling domain configurations
3. Results
The modeling exercise was conducted for a 10-day period between 10 and 19
June, 2008. The results from both MM5 and CMAQ are evaluated using a number
of statistical measures. The statistical results presented in
Table 1
shows that MM5
and CMAQ reproduced the observations fairly well. The predictions under-
estimated the observations for both models as expected, except for the ozone
levels at Büyükada station
(Fig. 3
). This may result from the meteorology due to
the topography. The location of the Büyükada station with an approximately 200
m is the highest crest point in the Marmara Sea where under the influence of high
wind speeds. However, due to the data limitation to evaluate the MM5 model for
this station, it was not possible have a solid idea on the error coming from meteoro-
logy. The differences between models predicted ozone levels and observations may
Table 1.
Statistical evaluation of MM5 and CMAQ models
MEASURES
MM5
CMAQ
T2
U10
V10
Kandilli
Büyükada
Correlation
0.81
0.51
0.67
0.55
0.26
Bias
−2.4
−1.7
−0.4
−3.09
6.85
RMSE
2.9
2.3
1.9
19.90
24.16
IOA
0.74
0.11
0.75
0.66
0.45
