Publications

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Hafner, S. D., Pedersen, J., Fuss, R., Kamp, J. N., Dalby, F. R., Amon, B., Pacholski, A., Adamsen, A. P. S. & Sommer, S. G. (2025). Improved tools for estimation of ammonia emission from field-applied animal slurry: Refinement of the ALFAM2 model and database. Atmospheric Environment, 340, Article 120910. https://doi.org/10.1016/j.atmosenv.2024.120910

Hafner, S. D., Møller, H. B., Dalby, F. R. & Romio, C. (2025). Management effects on methane emission from stored digestate - Insights from coupling heat transfer and microbial models. DCA rapport No. 238 https://dcapub.au.dk/djfpublikation/djfpdf/DCArapport238_net.pdf

Pedersen, J., Hafner, S. D., Kamp, J. N., Petersen, S. O. & Hutchings, N., (2025). Ammonia emissions from urea and ammonium sulfate application and the effect of injection and urease inhibitors under Danish conditions, No. 2024-0711286, 14 p., Mar 19, 2025. Rådgivningsnotat fra DCA – National Center for Fødevarer og Jordbrug

Sommer, S. G., Bruhn, A., Thomsen, S. T., Jensen, P. D. & Fretté, X. (2025). Biomass. In S. G. Sommer, M. L. Christensen, B. Norddahl, M. Ambye-Jensen & M. C. Roda-Serrat (Eds.), Bioprocesses: A Comprehensive Guide to Sustainable Resources in the Non-Fossil Era (pp. 8-82).

Støckler, A. H., Kamp, J. N., Feilberg, A., Dalby, F. R., Hafner, S. D. & Pedersen, J. (2025). Greenhouse gas emissions from storage of untreated pig slurry, digestate and the corresponding liquid fractions after solid-liquid separation. Journal of Environmental Management, 390, Article 126333. https://doi.org/10.1016/j.jenvman.2025.126333

Chen, M., Ran, H., Sommer, S. G., Liu, Y., Wang, G. & Zhu, K. (2024). The spatiotemporal heterogeneity of fertosphere hotspots impacted by biochar addition and the implications for NH₃ and N₂O emissions. Chemosphere, 355, Article 141769. https://doi.org/10.1016/j.chemosphere.2024.141769

Dalby, F. R., Hafner, S. D., Kamp, J. N. & Feilberg, A. (2024). Methane emission in slurry tanks as influenced by spatial and temporal temperature and slurry organic matter composition. Abstract from International symposium on gas and dust emissions from livestock (2024), Valencia, Spain.

Dalby, F. R., Hafner, S. D., Ambrose, H. W. & Adamsen, A. P. S. (2024). Modelling and measuring aerobic and anaerobic carbon loss from pig slurry storage. Abstract from EGU, Vienna, Austria. https://doi.org/10.5194/egusphere-egu24-22103

Dalby, F. R., Hafner, S. D., Ambrose, H. W. & Adamsen, A. P. S. (2024). Pig manure degradation and carbon emission: Measuring and modeling combined aerobic–anaerobic transformations. Journal of Environmental Quality, 53(5), 589-603. https://doi.org/10.1002/jeq2.20603

Hafner, S. D., Kamp, J. N. & Pedersen, J. (2024). Experimental and model-based comparison of wind tunnel and inverse dispersion model measurement of ammonia emission from field-applied animal slurry. Agricultural and Forest Meteorology, 344, Article 109790. https://doi.org/10.1016/j.agrformet.2023.109790

Hafner, S. D. (2024). Uncertainty in model predictions of ammonia volatilization from field-applied animal slurry. 89. Abstract from N Workshop, Aarhus, Denmark. https://conferences.au.dk/fileadmin/conferences/2024/nworkshop/Book_of_abstracts_NW2024.pdf

Hu, Y., Taghizadeh-Toosi, A., Kagendra, K. R. ., Smith, A. M., Nidal, K. & Sommer, S. G. (2024). Hydrochar from dairy sludge as phosphorus fertiliser affects greenhouse gas emissions and maize yield. Acta Agriculturae Scandinavica, Section B - Soil & Plant Science, 74(1), Article 2310276. https://doi.org/10.1080/09064710.2024.2310276

Hu, Y., Merl, T., Pedersen, J., Bornø, M. L., Tariq, A., Koren, K. & Sommer, S. G. (2024). Tracing N2O from dairy processing sludge amended soil with visualizing microscale heterogeneity of NH3 and pH (Short Communication). Atmospheric Environment: X, 23, Article 100283. https://doi.org/10.1016/j.aeaoa.2024.100283

Kamp, J. N., Hafner, S. D., Huijsmans, J., van Boheemen, K., Götze, H., Pacholski, A. S. & Pedersen, J. (2024). Comparison of two micrometeorological and three enclosure methods for measuring ammonia emission after slurry application in two field experiments. Agricultural and Forest Meteorology, 354, Article 110077. https://doi.org/10.1016/j.agrformet.2024.110077

Pedersen, J., Hafner, S. D., Pacholski, A. S., I. Karlsson, V., Rong, L., Labouriau, R. & Kamp, J. N. (2024). Evaluation of optimized flux chamber design for measurement of ammonia emission after field application of slurry with full-scale farm machinery. Atmospheric Measurement Techniques, 17(14), 4493–4505. https://doi.org/10.5194/amt-17-4493-2024

Støckler, A. H., Kamp, J. N., Feilberg, A., Hafner, S. D. & Pedersen, J. (2024). Effect of slurry separation on ammonia and greenhouse gas emissions during slurry storage and field application. 113. Abstract from N Workshop, Aarhus, Denmark. https://conferences.au.dk/fileadmin/conferences/2024/nworkshop/Book_of_abstracts_NW2024.pdf

Andersen, M. N., Møller, A. B., Greve, M. B., Børgesen, C. D., Adamsen, A. P. S., Hafner, S. D., Dalby, F. R., Lund, P., Hellwing, A. L. F., Børsting, C. F., Weisbjerg, M. R., Nørgaard, J. V., Sattarova, E., Albrektsen, R. & Mikkelsen, M. H. (2023). Følsomhedsanalyse af inklusion af mere aktivitetsdata i drivhusgasudledningsberegninger på bedriftsniveau. Rådgivningsrapport fra DCA - Nationalt Center for Fødevarer og Jordbrug

Andersson, K., Delin, S., Pedersen, J., Hafner, S. D. & Nyord, T. (2023). Ammonia emissions from untreated, separated and digested cattle slurry - Effects of slurry type and application strategy on a Swedish clay soil. Biosystems Engineering, 226, 194-208. https://doi.org/10.1016/j.biosystemseng.2023.01.012

Dalby, F. R., Adamsen, A. P. S., Lashkari, S., Hafner, S. D., Kai, P. & Børsting, C. F. (2023). A farm-scale model for predicting carbon and nitrogen emission and optimizing local farm management. Abstract from Agri Food and Climate Circle 2023, København, Denmark.

Dalby, F. R., Hafner, S. D. & Adamsen, A. P. S. (2023). Predicting methane emission from liquid manure and exploring mitigation options with integrated farm-scale modelling using the ABM model. 28. Abstract from RAMIRAN, Cambridge, United Kingdom.

Dalby, F. R., Hansen, M. J., Guldberg, L. B., Hafner, S. D. & Feilberg, A. (2023). Simple Management Changes Drastically Reduce Pig House Methane Emission in Combined Experimental and Modeling Study. Environmental Science & Technology, 57(9), 3990-4002. https://doi.org/10.1021/acs.est.2c08891

Hafner, S. D., Hutchings, N., Fuss, R., Häni, C., Kamp, J. N., Mathivanan, G. P., Pacholski, A. S., Pedersen, J., Petersen, V. & Sommer, S. G. (2023). Progress in estimation of ammonia loss from field-applied slurry: ALFAM2 model developments. Abstract from RAMIRAN, Cambridge, United Kingdom.

Hafner, S. D. & Mjöfors, K. (2023). STM: A software tool for predicting daily temperature in stored animal slurry. SoftwareX, 22, Article 101354. https://doi.org/10.1016/j.softx.2023.101354

Hu, Y., Thomsen, T. P., Fenton, O., Sommer, S. G., Shi, W. & Cui, W. (2023). Effects of dairy processing sludge and derived biochar on greenhouse gas emissions from Danish and Irish soils. Environmental Research, 216(Part 2), Article 114543. https://doi.org/10.1016/j.envres.2022.114543

Kamp, J. N., Pedersen, J., Huijsmans, J., Götze, H., Pacholski, A. S. & Hafner, S. D. (2023). Comparison of methods for measuring ammonia volatilization from field-applied slurry. Abstract from RAMIRAN, Cambridge, United Kingdom.

Kamp, J. N., Pedersen, J., Huijsmans, J., Götze, H., Pacholski, A. & Hafner, S. D. (2023). Measurement methods for ammonia emissions after field application of slurry. Abstract from EGU General Assembly 2023, Vienna, Austria. https://doi.org/10.5194/egusphere-egu23-12920

Lemes, Y. M., Nyord, T., Feilberg, A., Hafner, S. D. & Pedersen, J. (2023). Effect of anaerobic digestion on odor and ammonia emission from land-applied cattle manure. Journal of Environmental Management, 338, Article 117815. https://doi.org/10.1016/j.jenvman.2023.117815

Merl, T., Hu, Y., Pedersen, J., Zieger, S. E., Bornø, M. L., Tariq, A., Sommer, S. G. & Koren, K. (2023). Optical chemical sensors for soil analysis: possibilities and challenges of visualising NH3 concentrations as well as pH and O2 microscale heterogeneity. Environmental science: Advances, 2(9), 1210-1219. https://doi.org/10.1039/d3va00127j

Pedersen, J. & Hafner, S. D. (2023). Ammonia emissions after field application of anaerobically digested animal slurry: Literature review and perspectives. Agriculture, Ecosystems & Environment, 357, Article 108697. https://doi.org/10.1016/j.agee.2023.108697

Pedersen, J. & Hafner, S. D. (2023). Ammonia emissions after field application of anaerobically digested animal slurry: Literature review and perspectives. Abstract from RAMIRAN, Cambridge, United Kingdom.

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S., (2023). Ammonia emissions from field applied solid manure, No. 2021-0220838, 16 p., Mar 01, 2023.

Pedersen, J., Romio, C., Labouriau, R., Pacholski, A. S. & Hafner, S. D. (2023). Mitigating ammonia emission from slurry digestate applied to winter wheat crops: effect of digestate composition, digestate treatment, and application technique. Abstract from RAMIRAN, Cambridge, United Kingdom.

Pedersen, J., Hafner, S. D., Karlsson, V., Pacholski, A. S., Labouriau, R. & Kamp, J. N. (2023). Optimized design of flux chambers for online measurements of NH3 emission after field application of slurry with full-scale farm machinery. Abstract from EGU General Assembly 2023, Vienna, Austria. https://doi.org/10.5194/egusphere-egu23-12677

Smith, A. M., Sommer, S. G. & Taghizadeh-Toosi, A. (2023). Reduced Climate Impacts of Dairy Sludge Management by Introducing Hydrothermal Carbonization. Clean Energy and Sustainability, 1(1), Article 10003. https://doi.org/10.35534/ces.2023.10003

Sommer, S. G., Pedersen, J., Hafner, S. D. & Pacholski, A. S. (2023). Let's improve ammonia emission models for field-applied manure. Abstract from RAMIRAN, Cambridge, United Kingdom.

Støckler, A. H., Pedersen, J., Kamp, J. N., Feilberg, A. & Hafner, S. D. (2023). Effect of manure separation on ammonia emission during storage and subsequent field application. Abstract from EGU General Assembly 2023, Vienna, Austria. https://doi.org/10.5194/egusphere-egu23-12913

Dalby, F. R., Hafner, S. D., Petersen, S. O., Hansen, M. J., Adamsen, A. P. S. & Feilberg, A. (2022). The Anaerobic Biodegradation Model (ABM): A flexible tool for predicting methane emission from livestock manure. Poster session presented at Zero Greenhouse Emission in High Productive Agriculture, Hellerup, Denmark.

Dalby, F. R., Hafner, S. D., Petersen, S. O., Hansen, M. J., Adamsen, A. P. S. & Feilberg, A. (2022). The Anaerobic Biodegradation Model (ABM): A flexible tool for predicting methane emission from livestock manure. Abstract from 8th International Greenhouse Gas & Animal Agriculture Conference, Orlando, United States.

Hafner, S. D., Astals, S., Holliger, C., Koch, K., Nielsen, L., Refsahl, L. & Weinrich, S. (2022). Assessing the value of kinetic results from biochemical methane potential tests: Reproducibility from a large inter-laboratory study. Cleaner Chemical Engineering, 4, Article 100065. https://doi.org/10.1016/j.clce.2022.100065

Hafner, S. D. & Adamsen, A. P. S., (2022). Guidelines for selection of representative livestock barns and manure storages for measurement of greenhouse gas and ammonia emission for national inventories, No. 2021-0260400, 15 p., Nov 13, 2022. Advisory memorandum from DCA – Danish Centre for Food and Agriculture

Møller, H. B., Sørensen, P., Olesen, J. E., Petersen, S. O., Nyord, T. & Sommer, S. G. (2022). Agricultural Biogas Production—Climate and Environmental Impacts. Sustainability (Switzerland), 14(3), Article 1849. https://doi.org/10.3390/su14031849

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S. (2022). Ammoniakreduktionseffekt ved forsuring og udbringning ved slæbesko af væskefraktion fra separeret afgasset husdyrgødning. DCA - Nationalt Center for Fødevarer og Jordbrug. Rådgivningsrapport fra DCA - Nationalt Center for Fødevarer og Jordbrug

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S. (2022). Effectiveness of mechanical separation for reducing ammonia loss from field-applied slurry: Assessment through literature review and model calculations. Journal of Environmental Management, 323, Article 116196. https://doi.org/10.1016/j.jenvman.2022.116196

Pedersen, J., Hafner, S. D. & Adamsen, A. P. S. (2022). Vurdering af separation af flydende husdyrgødning som ny ammoniakreducerende udbringningsteknik. DCA - Nationalt Center for Fødevarer og Jordbrug. Rådgivningsrapport fra DCA - Nationalt Center for Fødevarer og Jordbrug

Sommer, S. G. & Hansen, M. N. (2022). Incorporation of deep litter reduce ammonia volatilization: Effect of incorporation depth and timing (Short Communication). Atmospheric Environment: X, 13, Article 100148. https://doi.org/10.1016/j.aeaoa.2022.100148

Sommer, S. G., Hafner, S. D., Laubach, J., van der Weerden, T. J., Leytem, A. B. & Pacholski, A. (2022). Model for calculating ammonia emission from stored animal liquid manure. Biosystems Engineering, 223(Part A), 41-55. https://doi.org/10.1016/j.biosystemseng.2022.08.007

Adamsen, A. P. S. & Hafner, S. D. (2021). Emissionsfaktorer for ammoniak fra ALFAM2 for afgasset biomasse.

Adamsen, A. P. S. & Hafner, S. D., (2021). Emissionsfaktorer for ammoniak fra ALFAM2 for ammoniakreducerende udbringningsteknikker, No. 2021-0294105, 8 p., Nov 17, 2021.

Adamsen, A. P. S., Nyord, T. & Hafner, S. D., (2021). The stability of pH of acidified stored manure slurry, No. 2021-0231465, 14 p., May 19, 2021.

Beltran, I., van der Weerden, T. J., Alfaro, M. A., Amon, B., de Klein, C. A. M., Grace, P., Hafner, S., Hassouna, M., Hutchings, N., Krol, D. J., Leytem, A. B., Noble, A., Salazar, F., Thorman, R. E. & Velthof, G. L. (2021). DATAMAN: A global database of nitrous oxide and ammonia emission factors for excreta deposited by livestock and land-applied manure. Journal of Environmental Quality, 50(2), 513-527. https://doi.org/10.1002/jeq2.20186

Displaying results 1 to 50 out of 544

Revised 16.01.2025

Sasha D. Hafner