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| Titel |
Comparison and evaluation of modelled and GOME measurement derived tropospheric NO2 columns over Western and Eastern Europe |
| VerfasserIn |
I. B. Konovalov, M. Beekmann, R. Vautard, J. P. Burrows, A. Richter, H. Nüß, N. Elansky |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 5, no. 1 ; Nr. 5, no. 1 (2005-01-24), S.169-190 |
| Datensatznummer |
250002215
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| Publikation (Nr.) |
 copernicus.org/acp-5-169-2005.pdf |
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| Zusammenfassung |
| We present the results of a first comparison of the tropospheric NO2 column amounts derived from the measurements of the Global Ozone Monitoring
Experiment (GOME) with the simulated data from a European scale chemistry
transport model (CTM) which is distinct from existing global scale CTMs in
higher horizontal resolution and more detailed description of the boundary
layer processes and emissions. We employ, on the one hand, the newly
developed extended version of the CHIMERE CTM, which covers both Western and
Eastern Europe, and, on the other hand, the most recent version (Version 2)
of GOME measurement based data-products, developed at the University of
Bremen. We evaluate our model with the data from ground based monitoring of
ozone and verify that it has a sufficiently high level of performance, which
is expected for a state-of-the-art continental scale CTM. The major focus of
the study is on a systematic statistical analysis and a comparison of
spatial variability of the tropospheric NO2 columns simulated with
CHIMERE and derived from GOME measurements. The analysis is performed
separately for Western and Eastern Europe using the data for summer months
of 1997 and 2001. In this way, we obtain useful information on the nature
and magnitudes of uncertainties of spatial distributions of the considered
data. Specifically, for Western Europe, it is found that the uncertainties
of NO2 columns from GOME and CHIMERE are predominantly of the
multiplicative character, and that the mean relative random (multiplicative)
errors of the GOME measurement derived and simulated data averaged over the
summer seasons considered do not exceed 23% and 32%, respectively. The
mean absolute (additive) errors of both kinds of the data are estimated to
be less than 3x1014mol/cm2. In Eastern Europe, the
uncertainties have more complex character, and the separation between their
multiplicative and additive parts is not sufficiently unambiguous. It is
found, however, that the total random errors of NO2 columns from both
GOME and CHIMERE over Eastern Europe are not, on the average, larger than
the errors of the NO2 columns with similar magnitudes over Western
Europe. |
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