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Keywords:

  • FLEXPART model;
  • Shangdianzi regional atmospheric background monitoring station;
  • GFS and ECWMF data;
  • characteristics of source distribution

Abstract

The FLEXPART model is a Lagrangian particle dispersion model developed by the Norwegian Institute for Air Research. In this paper, first the model simulation driven by GFS and ECWMF meteorological data is compared and evaluated with the observations of Shangdianzi station, then, taking CO as the tracer and adopting the method of screening background and non-background concentration, the FLEXPART model is used in tracing clean and polluted source areas of observation station. The comparisons of the simulations using GFS and ECWMF with the observations show that the two results using GFS and ECWMF are alike, and both can demonstrate the trend of CO concentration and better reflect the daily and monthly variation trend of CO. The correlation co-efficients of simulation value and actual measurement value of CO concentration are 0.67 and 0.71 for GFS and ECWMF respectively. Both simulations are slightly lower than the observations. Also the simulation discovers that the north-westnorthwest-northwest sector is the most important background sector of CO while the westsouthwest-south sector is the most important non-background sector for Shangdianzi station. The model can capture the distribution characteristics of background and pollution source areas of Shangdianzi station and better reflect the distribution of CO source areas in Beijing and the surrounding area. Copyright © 2013 Royal Meteorological Society