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In ecosystem research laser based gas monitors are increasingly used to measure fluxes of methane, nitrous oxide and even stable carbon isotopes. As these complex measurement devices under field conditions cannot be considered as absolutely stable, drift characterization is an issue to...
Eddy covariance flux measurements of methane, other trace gases, and fog droplets often involve modern analyzers that use digital signal processing. This allows to eliminate several potential sources of noise by using the digital signal directly in combination with a digital sonic anemometer....
Direct measurements of urban N 2 O emissions were made for the first time using the eddy-covariance technique from a tower, approximately 65 m above the street level of Edinburgh (Scotland, UK) during November 2005. The measured N 2 O concentrations had a median value of 358 ppbV and the overall...
A novel quantum cascade laser absorption spectrometer (QCL-AS) was tested to monitor N 2 O exchange fluxes over an intensively managed grassland using the eddy covariance approach. The instrument employs a continuous wave quantum cascade laser to scan over the absorption features of N 2 O, CH 4...
The uncertainty in eddy covariance (EC) flux measurements is assessed for CH 4 and N 2 O using data measured at a dairy farm site in the Netherlands in 2006 and 2007. An overview is given of the contributing uncertainties and their magnitude. The relative and absolute uncertainty of a 30 min EC...
Nitrous oxide (N 2 O) emissions are a large proportion of the agriculture sector's contribution to the greenhouse gas inventory of most developed countries. The spatial and temporal variability of N 2 O emissions from agricultural soils has long been considered the main factor limiting our...
A field campaign was undertaken over a rice paddy in Central Taiwan to investigate the flux of CH 4 through the flux-gradient method. During the campaign period, the average observed concentrations of CH 4 during the campaign period at the lower height (22.2 m above ground level, agl) and upper...
Methane fluxes measured in a eutrophic peat meadow in The Netherlands dominated by vascular plants showed high spatial and temporal variability. To elucidate this variability as well as the underlying processes, various measurement techniques were used: soil gradients of methane concentrations,...
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