Articles | Volume 14, issue 18
Biogeosciences, 14, 4161–4193, 2017
Biogeosciences, 14, 4161–4193, 2017
Research article
21 Sep 2017
Research article | 21 Sep 2017

Process-based modelling of NH3 exchange with grazed grasslands

Andrea Móring et al.

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Cited articles

Bell, M., Flechard, C., Fauvel, Y., Häni, C., Sintermann, J., Jocher, M., Menzi, H., Hensen, A., and Neftel, A.: Ammonia emissions from a grazed field estimated by miniDOAS measurements and inverse dispersion modelling, Atmos. Meas. Tech., 10, 1875–1892,, 2017.
Betteridge, K., Andrewes, W. G. K., and Sedcole, J. R.: Intake and excretion of nitrogen, potassium and phosporus by grazing steers, J. Agr. Sci., 106, 393–404,, 1986.
Betteridge, K., Hoogendoorn, C., Costall, D., Carter, M., and Griffiths, W.: Sensors for detecting and logging spatial distribution of urine patches of grazing female sheep and cattle, Comput. Electron. Agr., 73, 66–73,, 2010.
Burkhardt, J., Flechard, C. R., Gresens, F., Mattsson, M., Jongejan, P. A. C., Erisman, J. W., Weidinger, T., Meszaros, R., Nemitz, E., and Sutton, M. A.: Modelling the dynamic chemical interactions of atmospheric ammonia with leaf surface wetness in a managed grassland canopy, Biogeosciences, 6, 67–84,, 2009.
Dennis, S. J., Moir, J. L., Cameron, K. C., Edwards, G. R., and Di, H. J.: Measuring excreta patch distribution in grazed pasture through low-cost image analysis, Grass Forage Sci., 68, 378–385,, 2013.
Short summary
This study describes and evaluates a new ammonia (NH3) exchange model for grazed fields (GAG_field). GAG_field is able to simulate the main features of the observed NH3 fluxes. A sensitivity analysis for the non-meteorological model parameters showed that the sensitivity of the NH3 fluxes to a parameter varies among urine patches. Moreover, the fluxes modelled with a dynamic soil pH are similar if a constant pH 7.5 is used, suggesting a useful simplification for regional-scale model application.
Final-revised paper