The global tropospheric distribution of NOx estimated by a three‐dimensional chemical tracer model
Abstract
The global distribution of NO x in the troposphere is calculated using a simple three‐dimensional chemical tracer model. This model includes a simplified chemistry scheme for the tracers NO x ≡ NO + NO 2 and HNO 3 , which are redistributed by advection, dry and wet convection, and large‐scale diffusion. The sources of NO x considered are fossil fuel combustion, emissions from soil microbial activity, biomass burning, lightning discharges, emissions by aircraft, and downward transport from the stratosphere. Dry and wet deposition act as final sinks. At northern middle and high latitudes the calculated tropospheric NO x content is dominated by the surface sources, fossil fuel combustion in particular. In the tropical free troposphere, lightning discharges provide about 80% of the total NO x throughout the year. The zonally averaged fractional contribution of aircraft emissions strongly depends on the season. The largest contribution of this source, over 60%, occurs during January in the upper troposphere between 45°N and 60°N. The NO mixing ratios determined by the model show good overall agreement with vertical profiles measured during the Stratospheric Ozone Experiment (STRATOZ) III aircraft campaign.
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