References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-2663-2009

Influence of modelled soil biogenic NO emissions on related trace gases and the atmospheric oxidizing efficiency

Steinkamp

¹ Ganzeveld

L. N.

² Wilcke

³ Lawrence

M. G.

Department of Atmospheric Chemistry, Max-Planck-Institute for Chemistry, Mainz, Germany

Department of Environmental Sciences, Chairgroup Earth System Sciences, Wageningen University and Research Centre, Wageningen, The Netherlands

Geographic Institute, Johannes Gutenberg University, Mainz, Germany

23 04 2009

9 8 2663 2677

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The emission of nitric oxide (NO) by soils (SNOx) is an important source of oxides of nitrogen (NOx=NO+NO2) in the troposphere, with estimates ranging from 4 to 21 Tg of nitrogen per year. Previous studies have examined the influence of SNOx on ozone (O3) chemistry. We employ the ECHAM5/MESSy atmospheric chemistry model (EMAC) to go further in the reaction chain and investigate the influence of SNOx on lower tropospheric NOx, O3, peroxyacetyl nitrate (PAN), nitric acid (HNO3), the hydroxyl radical (OH) and the lifetime of methane (τCH4). We show that SNOx is responsible for a significant contribution to the NOx mixing ratio in many regions, especially in the tropics. Furthermore, the concentration of OH is substantially increased due to SNOx, resulting in an enhanced oxidizing efficiency of the global troposphere, reflected in a ~10% decrease in τCH4 due to soil NO emissions. On the other hand, in some regions SNOx has a negative feedback on the lifetime of NOx through O3 and OH, which results in regional increases in the mixing ratio of NOx despite lower total emissions in a simulation without SNOx. In a sensitivity simulation in which we reduce the other surface NOx emissions by the same amount as SNOx, we find that they have a much weaker impact on OH and τCH4 and do not result in an increase in the NOx mixing ratio anywhere.

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