Analysis of tropospheric NOx over Asia using the model of atmospheric transport and chemistry (MATCH-MPIC) and GOME-satellite observations

摘要: Abstract The distribution and budget of tropospheric NOx over Asia, especially India, are examined using the global 3D chemistry–meteorology model MATCH-MPIC GOME NO2 columns. Enhanced abundances China northeast India reproduced by model, as pronounced maxima during biomass burning periods, though somewhat underestimated. mean column is also reproduced, has trouble with seasonal cycle for unknown reasons. Model sensitivity tests Indian region indicate that scaled to changes in local source 60–70% lower only 10–25% O3, indicating moderate reductions or increases current emissions not expected lead large regional O3 levels. In upper troposphere, winter nearly all comes from remote sources, while summer deep convection causes troposphere become sensitive surface (∼40–50% sensitivity) lightning production (∼10–20%). lifetime estimated based on MATCH output about 15–23 h, comparable (14–21 h), Indonesia (23–43 h) North Asia (21–47 h), it longer highly seasonal. Implications these results discussed.