Biogeosciences
www.biogeosciences.net
1726-4170
1726-4189
5
2
2008
10.5194/bg-5-475-2008
http://www.biogeosciences.net/5/475/2008/
http://www.biogeosciences.net/5/475/2008/bg-5-475-2008.html
http://www.biogeosciences.net/5/475/2008/bg-5-475-2008.pdf
475
483
2008-04-01
Soil atmosphere exchange of carbonyl sulfide (COS) regulated by diffusivity depending on water-filled pore space
H. Van Diest
J. Kesselmeier
jks@mpch-mainz.mpg.de
Max Planck Institute for Chemistry, Biogeochemistry Dept., Joh.-J.-Becher-Weg 27, 55128 Mainz, Germany
The exchange of carbonyl sulfide (COS) between soil and the atmosphere was
investigated for three arable soils from Germany, China and Finland and one
forest soil from Siberia for parameterization in the relation to ambient
carbonyl sulfide (COS) concentration, soil water content (WC) and air
temperature. All investigated soils acted as sinks for COS. A clear and
distinct uptake optimum was found for the German, Chinese, Finnish and
Siberian soils at 11.5%, 9%, 11.5%, and 9% soil WC,
respectively, indicating that the soil WC acts as an important biological
and physical parameter for characterizing the exchange of COS between soils
and the atmosphere. Different optima of deposition velocities (<i>V<sub>d</sub></i>) as
observed for the Chinese, Finnish and Siberian boreal soil types in relation
to their soil WC, aligned at 19% in relation to the water-filled pore
space (WFPS), indicating the dominating role of gas diffusion. This
interpretation was supported by the linear correlation between <i>V<sub>d</sub></i> and
bulk density. We suggest that the uptake of COS depends on the diffusivity
dominated by WFPS, a parameter depending on soil WC, soil structure and
porosity of the soil.
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