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| Titel |
Comparisons of WRF/Chem simulations in Mexico City with ground-based RAMA measurements during the 2006-MILAGRO |
| VerfasserIn |
Y. Zhang, M. K. Dubey, S. C. Olsen, J. Zheng, R. Zhang |
| 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 ; 9, no. 11 ; Nr. 9, no. 11 (2009-06-11), S.3777-3798 |
| Datensatznummer |
250007366
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| Publikation (Nr.) |
 copernicus.org/acp-9-3777-2009.pdf |
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| Zusammenfassung |
| Simulations using the fully coupled WRF/Chem (Weather Research and
Forecasting – Chemistry) model at 3-km resolution in Mexico City have been
performed to examine the temperature, relative humidity, wind, and gaseous
criteria pollutants (CO, O3, NO, NO2, and NOy) during the
MCMA-2006/MILAGRO field campaign. Comparison of the model simulations with
measurements from the ground-based air quality monitoring network (RAMA) is
presented. The model resolves reasonably well the observed surface
temperature, relative humidity and wind speed; however, large discrepancies
are identified between the simulated and the observed surface wind direction
for wind speeds below 2 m s−1. The simulated chemical species
concentrations (CO, O3, NO, NO2, and NOy) compare favorably
with the observations. Simulated O3 concentrations agree especially
well with the observations. The simulated 10 VOC species compare generally
favorably with the observations at the T0 supersite although lower
correlation coefficients and larger biases exist for propene, acetone and
propanal, isoprene, and c10-aromatics when compared to the other VOC
species. The model performs much better during daytime than nighttime for
both chemical species and meteorological variables, although the model tends
to underestimate daytime temperature and relative humidity. Simulations
using combinations of the available PBL schemes and land surface models
(LSMs) do not show a preferred combination in reproducing the observations.
The simulated meteorological fields under the O3-South, O3-North and EI
Norte weather episodes exhibit similar correlation coefficients and biases
for the same variable. However, the model performs well for the O3-South
episode but inferiorly for the El Norte events in resolving the observed
chemical species. |
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