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UP: Fachverband Umweltphysik
UP 8: Methoden I
UP 8.3: Talk
Thursday, March 5, 2009, 15:00–15:12, VMP 8 R206
Combined FTIR-micrometeorological techniques for long term measurements of greenhouse gas fluxes from agriculture — •Anna Katinka Petersen1, David Griffith2, Mike Harvey3, Travis Naylor2, and Murray Smith3 — 1Institut für Umweltphysik (IUP), Universität Bremen — 2Centre for Atmospheric Chemistry, University of Wollongong, NSW, Australia — 3National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand
Agricultural systems can be sources or sinks of atmospheric trace gases, and the measurement of the fluxes is necessary when evaluating both the environmental impact of agricultural activities and the impact of atmospheric pollution on agricultural production and sustainability. With the exception of CO2, micrometeorological measurements of the fluxes of greenhouse gases are still mostly possible only in campaign mode due to the complexity and logistical requirements of the existing techniques. We have developed an instrument system for long-term flux measurements through a combination of micrometeorological flux measurement techniques (Relaxed Eddy Accumulation (REA) and Flux-Gradient (FG)) with FTIR spectroscopy. The combined technique is capable of simultaneous flux measurements of N2O, CH4 and CO2 at paddock to regional scales continuously, over longer terms. The system was tested on a 3 weeks field campaign. The flux of the atmospheric CO2 was measured by Relaxed Eddy Accumulation, Flux-Gradient, and Eddy Correlation. Simultaneously, fluxes of CH4 and N2O were measured by REA and FG technique.