ammonia fluxes in relation to cutting and fertilization of an intensively managed grassland derived from an inter-comparison of gradient measurements
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2009
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Abstract
Quantification of ammonia (NH<sub>3</sub>) land-atmosphere exchange is required for atmospheric modelling and assessment of nitrogen deposition, yet flux measurement methods remain highly uncertain. To address this issue, a major inter-comparison of ammonia fluxes over intensively managed grassland was conducted during the GRAMINAE Integrated Experiment held in Braunschweig, Germany. In order to provide a robust dataset of ammonia exchange with the vegetation, four independent continuous flux gradient systems were operated. Three independently operated continuous wet denuders systems (AMANDA) were compared with a Wet Effluent Diffusion Denuder (mini-WEDD) system. Measurements were made at two distances from an adjacent livestock farm, allowing effects of advection to be quantified in a real landscape setting. Data treatment included filtering for instrument failure, disturbed wind sectors and unsuitable micrometeorological conditions, with corrections made for storage and advection errors. <br><br> The inter-comparison demonstrated good agreement in measured ammonia concentrations and fluxes (relative standard error <20%) for some periods, although the performance of the ammonia analyzers were variable, with much poorer agreement on particular days. However, by using four systems, the inter-comparison was able to provide a robust mean estimate of continuous ammonia fluxes through the experiment. The observed fluxes were: a) small bi-directional fluxes prior to cutting (−64 to 42 ng NH<sub>3</sub> m<sup>−2</sup> s<sup>−1</sup>), b) larger diurnally-varying emissions following cutting (−49 to 703 ng NH<sub>3</sub> m<sup>−2</sup> s<sup>−1</sup>) and c) much larger emissions following fertilizer application (0 to 3820 ng NH<sub>3</sub> m<sup>−2</sup> s<sup>−1</sup>). The results are a salutary reminder of the uncertainty in unreplicated ammonia flux measurements, while the replication of the present study provides a uniquely robust dataset for the evaluation of ammonia exchange processes. It is clear that consistently reliable determination of ammonia concentrations remains the major measurement challenge.
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milford2009biogeosciencesammonia
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| Authors | ;C. Milford;M. R. Theobald;E. Nemitz;K. J. Hargreaves;L. Horvath;J. Raso;U. Dämmgen;A. Neftel;S. K. Jones;A. Hensen;B. Loubet;P. Cellier;M. A. Sutton |
| Journal | tetrahedron letters |
| Year | 2009 |
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