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| Titel |
A comparison study between CMAQ-simulated and OMI-retrieved NO2 columns over East Asia for evaluation of NOx emission fluxes of INTEX-B, CAPSS, and REAS inventories |
| VerfasserIn |
K. M. Han, S. Lee, L. S. Chang, C. H. Song |
| 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 ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-24), S.1913-1938 |
| Datensatznummer |
250119451
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| Publikation (Nr.) |
 copernicus.org/acp-15-1913-2015.pdf |
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| Zusammenfassung |
| Comparison between the CMAQ (Community
Multi-scale Air Quality Model)-calculated and OMI (Ozone Monitoring Instrument)-retrieved tropospheric
NO2 columns was carried out for 2006 over East Asia (100–150° E; 20–50° N) to evaluate the bottom-up
NOx emission fluxes of INTEX-B, CAPSS, and REAS v1.11 inventories. The
three emission inventories were applied to the CMAQ model simulations for
the countries of China, South Korea, and Japan, respectively. For the direct
comparison between the two NO2 columns, the averaging kernels (AKs)
obtained from the Royal Netherlands Meteorological Institute (KNMI)/DOMINO
v2.0 daily product were applied to the CMAQ-simulated data. The analysis
showed that the two tropospheric NO2 columns from the CMAQ model
simulations and OMI observations (ΩCMAQ,AK and ΩOMI) had good spatial and seasonal correlation, with correlation
coefficients ranging from 0.71 to 0.96. In addition, the normalized mean
errors (NMEs) between the ΩCMAQ,AK and ΩOMI were
found to range from ~ 40 to ~ 63%. The
ΩCMAQ,AK were, on annual average, ~ 28%
smaller (in terms of the NMEs) than the ΩOMI, indicating that
the NOx emissions used were possibly underestimated in East Asia. Large
absolute differences between the ΩCMAQ,AK and ΩOMI
were found, particularly over central eastern China (CEC) during winter (annual
averaged mean error of ~ 4.51 × 1015 molecules cm−2). Although such differences between the ΩCMAQ,AK and
ΩOMI are likely caused by the errors and biases in the
NOx emissions used in the CMAQ model simulations, it can be rather
difficult to quantitatively relate the differences to the accuracy of the
NOx emissions, because there are also several uncertain factors in the
CMAQ model, satellite-retrieved NO2 columns and AK products, and
NOx and other trace gas emissions. In this context, three uncertain
factors were selected and analyzed with sensitivity runs (monthly variations
in NOx emissions; influences of different NOx emission fluxes; and
reaction probability of N2O5 radicals). Other uncertain or
possible influential factors were also discussed to suggest future direction
of the study. |
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