Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-10227-2008
http://www.atmos-chem-phys-discuss.net/8/10227/2008/
http://www.atmos-chem-phys-discuss.net/8/10227/2008/acpd-8-10227-2008.html
http://www.atmos-chem-phys-discuss.net/8/10227/2008/acpd-8-10227-2008.pdf
10227
10255
2008-05-30
Influence of modelled soil biogenic NO emissions on related trace gases and the atmospheric oxidizing efficiency
J. Steinkamp
steinkam@mpch-mainz.mpg.de
L. N. Ganzeveld
W. Wilcke
M. G. Lawrence
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, Netherlands
Geographic Institute, Johannes Gutenberg University, Mainz, Germany
The emission of nitric oxide (NO) by soils (SNOx) is an important
source of oxides of nitrogen (NO<sub>x</sub>=NO+NO<sub>2</sub>) 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 (O<sub>3</sub>)
chemistry. We employ the ECHAM5/MESSy earth system model to go further
in the reaction chain and investigate the influence of SNOx on lower
tropospheric NO<sub>x</sub>, O<sub>3</sub>, peroxyaceltyl nitrate (PAN), nitric acid
(HNO<sub>3</sub>), the hydroxyl radical (OH) and the lifetime of methane
(τ<sub>CH<sub>4</sub></sub>). We show that SNOx is responsible for a
significant contribution to the NO<sub>x</sub> mixing ratio in many regions,
especially in the tropics. On the other hand in some regions SNOx has
a negative feedback on the lifetime of NO<sub>x</sub> through O<sub>3</sub> and OH,
which results in regional increases in the mixing ratio of NO<sub>x</sub>
despite lower total emissions in a simulation without
SNOx. 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
τ<sub>CH<sub>4</sub></sub> due to soil NO emissions.
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