GAs flux

Vienna Scientific Instruments designs and builds chambers and devices allowing to sample and measure gas fluxes. Gas exchange measurements (e.g. on greenhouse gases including CO2) are often made with the closed, non-steady state chamber technique whereby a chamber is placed on top of the soil for a short interval and the change in gas concentrations in the chamber headspace is monitored over time - either by continued measurements or sampling of gas aliquots from the chamber headspace. The resulting time series of gas concentration measurements makes it possible to estimate the surface–atmosphere exchange with the plot on which the chamber was installed. In open dynamic systems (=steady-state flow-through systems) fesh ambient air is pumped into or pulled from a chamber, and flux is calculated using the air flow rate and the difference in concentrations between the air entering and leaving the chamber after the air in the chamber headspace has reached a steady state.

 

We are / were involved in several research projects aiming to develop automatic, UAV-based gas sampling technology ("Iso-Drone") allowing to measure isotope rates of greenhouse gases and water vapour to replace costly research infrastructure such as Eddy towers etc. 

Selected readings on Chamber based gas fluX MEASUREMENTS

  • Lüpke, M., R. Steinbrecher, M. Leuchner, and A. Menzel. 2017. The Tree Drought Emission MONitor (Tree DEMON), an innovative system for assessing biogenic volatile organic compounds emission from plants. Plant Methods 13:14.
  • Madsen, R., Xu, L, Mcdermitt D. 2010. Considerations for making chamber-based soil CO2 flux measurements. Pages 28-31 in Proceedings of the 19th World Congress of Soil Science: Soil solutions for a changing world, Brisbane, Australia, 1-6 August 2010. Congress Symposium 4: Greenhouse gases from soils. International Union of Soil Sciences (IUSS), c/o Institut für Bodenforschung, Universität für Bodenkultur.
  • Pumpanen, J., P. Kolari, H. Ilvesniemi, K. Minkkinen, T. Vesala, S. Niinisto, A. Lohila, T. Larmola, M. Morero, M. Pihlatie, I. Janssens, J. C. Yuste, J. M. Grnzweig, S. Reth, J. A. Subke, K. Savage, W. Kutsch, G. Ostreng, W. Ziegler, P. Anthoni, A. Lindroth, and P. Hari. 2004. Comparison of different chamber techniques for measuring soil CO2 efflux. Agricultural and Forest Meteorology 123:159-176.
  • Siegenthaler, A., B. Welch, S. R. Pangala, M. Peacock, and V. Gauci. 2016. Semi-rigid chambers for methane gas flux measurements on tree stems. Biogeosciences 13:1197.
  • Timkovsky, J., P. Gankema, R. Pierik, and R. Holzinger. 2014. A plant chamber system with downstream reaction chamber to study the effects of pollution on biogenic emissions. Environmental Science: Processes & Impacts 16:2301-2312.
  • Zhang, X., R. Schwantes, R. McVay, H. Lignell, M. Coggon, R. Flagan, and J. Seinfeld. 2015. Vapor wall deposition in Teflon chambers. Atmospheric Chemistry and Physics 15:4197-4214.