Abstract
We studied Asian scale CO source-receptor (S-R) relationship from 2004-2011 based on the tagged CO tracer model. GEOS Chem (Version 9-1-1) was used with a high-resolution Asian domain (0.5˚ x 0.667˚ resolution) which was 1-way nested into the global domain. Ten tagged regions were set within the Asian region. The REAS2.0 emission inventory was used as the Asian anthropogenic emission. The model results were compared with 6 ground base station and MOPITT satellite retrieval data. The model results showed clear year-by-year variations, and showed a reasonable agreement with the observations. For the observation sites within the Asian domain, the impact from the Chinese CO emission was dominant and we successfully summarized the relationship between the CO emission from the tagged regions and corresponding CO contribution from each receptor site. It was found that the long-term CO variations were controlled both from Asian and global emission source changes, and also significantly by the year-to-year meteorological conditions (outflow efficiency from China). We also showed that the contribution from non-Asian emissions was also especially important in the springtime that was underestimated by the model simulation.
