Evaluating a flux-gradient approach for flux and deposition velocity of nitrogen dioxide over short-grass surfaces
- Watt, S. A
- Wagner-Riddle, C
- Edward, G
- Vet, R. J
DOIAbstract
Use of micrometeorological methods for measurement of surface NO and NO₂ fluxes is problematic due to chemical reactions of the O₃–NO–NO₂ triad in the surface air layer resulting in violation of the assumption of flux constancy with height. Application of a flux-gradient approach close to a short-grass surface (<1 m) minimises this problem, and allows for continuous monitoring of flux and deposition velocity under varying environmental conditions. In this study, we evaluate data collected using a flux-gradient approach for NO and NO₂ flux determination over turfgrass from May to August 2001 in Ontario, Canada. Gas concentrations were determined using two chemiluminescence analysers sampling at 2 Hz from two heights of 0.3 and 0.5 m. Deposit...
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