Eddy Covariance Flux Measurements of NH3 and NOy with a Dual-Channel Thermal Converter
- Resource Type
- Conference
- Authors
- Ammann, Christof; Jocher, Markus; Voglmeier, Karl
- Source
- 2019 IEEE International Workshop on Metrology for Agriculture and Forestry (MetroAgriFor) Metrology for Agriculture and Forestry (MetroAgriFor), 2019 IEEE International Workshop on. :46-51 Oct, 2019
- Subject
- Bioengineering
Engineering Profession
General Topics for Engineers
Signal Processing and Analysis
Compounds
Electron tubes
Nitrogen
Velocity measurement
Atmospheric measurements
Particle measurements
Poles and towers
reactive nitrogen
pasture
emission
deposition
micrometeorology
- Language
Surface-atmosphere exchange of reactive nitrogen (N r ) plays a major role in the nutrient availability or loss of (semi-) natural and agricultural ecosystems. We present a fast response dual-channel converter for the eddy covariance flux measurement of oxidized and reduced N r compounds. The system was tested over a managed pasture system and during release experiments with an artificial emission source. The measured concentrations showed good agreement with the sum of independent specific measurements of NO, NO2 and NH3. Generally, emissions of reduced N r (attributed to NH3) were much larger than deposition of NO y for the pasture field. A slurry spreading by trailing hose in late winter showed moderate but significant NH3 emissions lasting for about eight days.