HR: 1330h
AN: A32A-0128    [PDF]
TI: Application of the Membrane Tube Technique for Simultaneous Measurements of Soil Air Concentration Profiles of $\textrm{NO}$, $\textrm{N}_{2}\textrm{O}$, $\textrm{CO}_{2}$, $\textrm{CH}_{4}$, and $^{222}\textrm{Rn}$ in a Temperate Forest Soil
AU: * Lehmann, L
EM: llehmann@mpch-mainz.mpg.de
AF: Department of Biogeochemistry, Max Planck Institute for Chemistry, P.O. box 3060, Mainz, 55020 Germany
AU: Meixner, F X
EM: meixner@mpch-mainz.mpg.de
AF: Department of Biogeochemistry, Max Planck Institute for Chemistry, P.O. box 3060, Mainz, 55020 Germany
AB: Using the membrane tube technique (METT), soil air concentration profiles of $\textrm{NO}$, $\textrm{N}_{2}\textrm{O}$, $\textrm{CO}_{2}$, $\textrm{CH}_{4}$, and $^{222}\textrm{Rn}$ were continuously measured in a typical luvic stagnosol in a German mixed forest of oak and birch (Juelich, Germany; $50^{\deg}54\, \textrm{N},\, 6^{\deg}24\, \textrm{E}$) during the ECHO field campaign in July 2003 (\textbf{E}mission and \textbf{CH}emical \textbf{T}ransformation of Biogenic Volatile \textbf{O}rganic Compounds). In April 2002 semipermeable tubes were installed at the soil surface and in 2, 7 and 12 cm depth. $\textrm{N}_{2}\textrm{O}$, $\textrm{CO}_{2}$, $\textrm{CH}_{4}$, and $^{222}\textrm{Rn}$ concentrations were measured with non-destructive methods in a closed cycle system to avoid soil air concentration changes by external gas input. Since $\textrm{NO}$ was measured with a chemiluminescence technique ("destructive method"), the air sampled was replaced by air from a dilution system where the $\textrm{NO}$ concentration was adjusted to the concentration measured in the soil. Soil air profile measurements were accompanied by simultaneous measurements of (a) profiles of soil moisture and soil temperature, (b) meteorological parameters, (c) soil chamber measurements ($\textrm{NO}$, $\textrm{NO}_{2}$, $\textrm{O}_{3}$, $^{222}\textrm{Rn}$), and (d) physical and chemical soil parameters to put soil air concentration changes into context and to infer corresponding fluxes from the concentration profiles.
DE: 0315 Biosphere/atmosphere interactions
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting