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Huijnen, V. [Author]; Eskes, H.J. [Author]; Gross, A. [Author]; Robertson, L. [Author]; D'Isidoro, M. [Author]; Kioutsioukis, I. [Author]; Friese, E. [Author]; Amstrup, B. [Author]; Berstrom, R. [Author]; Strunk, A. [Author]; Vira, J. [Author]; Zyryanov, D. [Author]; Poupkou, A. [Author]; Maurizi, A. [Author]; Melas, D. [Author]; Peuch, V.-H. [Author]; Zerefos, C. [Author]; Elbern, H. [Author]; Boersma, K.F. [Author]; Foret, G. [Author]; Sofiev, M. [Author]; Valdebenito, A. [Author]; Flemming, J. [Author]; Stein, O. [Author]

Comparison of OMI NO2 tropospheric columns with an ensemble of global and European regional air quality models

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  • Media type: E-Article
  • Title: Comparison of OMI NO2 tropospheric columns with an ensemble of global and European regional air quality models
  • Contributor: Huijnen, V. [Author]; Eskes, H.J. [Author]; Gross, A. [Author]; Robertson, L. [Author]; D'Isidoro, M. [Author]; Kioutsioukis, I. [Author]; Friese, E. [Author]; Amstrup, B. [Author]; Berstrom, R. [Author]; Strunk, A. [Author]; Vira, J. [Author]; Zyryanov, D. [Author]; Poupkou, A. [Author]; Maurizi, A. [Author]; Melas, D. [Author]; Peuch, V.-H. [Author]; Zerefos, C. [Author]; Elbern, H. [Author]; Boersma, K.F. [Author]; Foret, G. [Author]; Sofiev, M. [Author]; Valdebenito, A. [Author]; Flemming, J. [Author]; Stein, O. [Author]
  • imprint: EGU, 2010
  • Published in: Atmospheric chemistry and physics 10, 3273 - 3296 (2010).
  • Language: English
  • ISSN: 1680-7316
  • Keywords:
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: We present a comparison of tropospheric NO2 from OMI measurements to the median of an ensemble of Regional Air Quality (RAQ) models, and an intercomparison of the contributing RAQ models and two global models for the period July 2008 - June 2009 over Europe. The model forecasts were produced routinely on a daily basis in the context of the European GEMS ("Global and regional Earth-system (atmosphere) Monitoring using Satellite and in-situ data") project. The tropospheric vertical column of the RAQ ensemble median shows a spatial distribution which agrees well with the OMI NO2 observations, with a correlation r=0.8. This is higher than the correlations from any one of the individual RAQ models, which supports the use of a model ensemble approach for regional air pollution forecasting. The global models show high correlations compared to OMI, but with significantly less spatial detail, due to their coarser resolution. Deviations in the tropospheric NO2 columns of individual RAQ models from the mean were in the range of 20-34% in winter and 40-62% in summer, suggesting that the RAQ ensemble prediction is relatively more uncertain in the summer months.The ensemble median shows a stronger seasonal cycle of NO2 columns than OMI, and the ensemble is on average 50% below the OMI observations in summer, whereas in winter the bias is small. On the other hand the ensemble median shows a somewhat weaker seasonal cycle than NO2 surface observations from the Dutch Air Quality Network, and on average a negative bias of 14%.Full profile information was available for two RAQ models and for the global models. For these models the retrieval averaging kernel was applied. Minor differences are found for area-averaged model columns with and without applying the kernel, which shows that the impact of replacing the a priori profiles by the RAQ model profiles is on average small. However, the contrast between major hotspots and rural areas is stronger for the direct modeled vertical columns than the columns where the averaging kernels ...
  • Access State: Open Access