Abstract
NO2 vertical profiles were retrieved via ground based MAX-DOAS measurements for the summer period in 2006 in Beijing, one of the megacities in the Northeast Asia. Large portion of NO2 load was observed at the 0-1 km layer. We found that NO2 rapidly decreases up to the altitude of 3 km. In addition, the retrieved NO2 mixing ratios within 0-1 km layer were compared with those observed at the surface by in-situ monitor. The correlation coefficient (R) between NO2mixing ratios within 0-1 km layer and those at the surface was calculated to be 0.7. The major causes of such discrepancy are thought to be both differences in measured areas and rapid decrease in NO2 mixing ratio with height.
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