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Global uptake of carbonyl sulfide (COS) by terrestrial vegetation: Estimates corrected by deposition velocities normalized to the uptake of carbon dioxide (CO2)
1Max Planck Institute for Chemistry, Biogeochemistry Dept., Joh.-J.-Becher-Weg 27, 55128 Mainz, Germany
2University of Applied Sciences Solothurn, Institute for Automation, 4600 Olten, Switzerland
3Research Centre Jülich, Institute of Chemistry and Dynamics of the Geosphere (IGG-I), 52425 Jülich, Germany
4Institute for General Botany, University of Mainz, Müllerweg 6, 55128 Mainz, Germany
5National University, Atmospheric Chemistry Laboratory, 86-3000, Heredia, Costa Rica
Abstract. COS uptake by trees, as observed under dark/light changes and under application of the plant hormone abscisic acid, exhibited a strong correlation with the CO2 assimilation rate and the stomatal conductance. As the uptake of COS occurred exclusively through the stomata we compared experimentally derived and re-evaluated deposition velocities (Vd for COS and CO2). We show that Vd of COS is generally significantly larger than that of CO2. We therefore introduced this attribute into a new global estimate of COS fluxes into vegetation. The global COS uptake by vegetation as estimated by the new model ranges between 0.69-1.40 Tg a-1, based on the Net Primary Productivity (NPP). Taking into account Gross Primary Productivity (GPP) the deposition estimate ranges between 1.37-2.81 Tg a-1 (0.73-1.50 Tg S a-1). We believe that in order to obtain accurate and reliable global NPP-based estimates for the COS flux into vegetation, the different deposition velocities of COS and CO2 must be taken into account.
Discussion Paper (PDF, 365 KB) Interactive Discussion (Closed, 4 Comments) Final Revised Paper (BG)
Citation: Sandoval-Soto, L., Stanimirov, M., von Hobe, M., Schmitt, V., Valdes, J., Wild, A., and Kesselmeier, J.: Global uptake of carbonyl sulfide (COS) by terrestrial vegetation: Estimates corrected by deposition velocities normalized to the uptake of carbon dioxide (CO2), Biogeosciences Discuss., 2, 183-201, 2005. Bibtex EndNote Reference Manager
