Preprints
https://doi.org/10.5194/amt-2023-212
https://doi.org/10.5194/amt-2023-212
04 Jan 2024
 | 04 Jan 2024
Status: this preprint is currently under review for the journal AMT.

Optimized design of flux chambers for measurement of ammonia emission after field application of slurry with full-scale farm machinery

Johanna Pedersen, Sasha D. Hafner, Andreas Pacholski, Valthor I. Karlsson, Li Rong, Rodrigo Labouriau, and Jesper N. Kamp

Abstract. Field applied liquid animal manure (slurry) is a significant source of ammonia (NH3) emission, which is harmful to the environment and human health. To evaluate mitigation options, reliable measurements of effects are needed. A new system of dynamic flux chambers (DFC) with high time resolution online measurements was developed. The system was investigated in silico with computational fluid dynamics and tested in three field trials, each trial assessing the variability after application with trailing hose at different scales: manual (handheld), 3-m experimental slurry boom, and 30-m farm-scale commercial slurry boom. For the experiments with machine application, parallel NH3 emission measurements were made using an inverse dispersion modelling method (backward Lagrangian stochastic modelling, bLS). The lowest coefficient of variation of replicate DFC measurements was obtained with manual application, followed by the 3-m slurry boom, and lastly the 30-m slurry boom. Conditions in DFCs resulted in a consistently higher NH3 flux than what was measured with the inverse dispersion technique but both methods showed a similar emission reduction by injection compared to trailing hose: 89 % by DFC and 97 % by bLS. The new measurement system facilitates NH3 emission measurement with replication after both manual and farm-scale slurry application with relatively high precision, with a coefficient of variation of 5 % among replicates with manual slurry application and 20 % for farm-scale slurry application.

Johanna Pedersen, Sasha D. Hafner, Andreas Pacholski, Valthor I. Karlsson, Li Rong, Rodrigo Labouriau, and Jesper N. Kamp

Status: open (until 03 Apr 2024)

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  • RC1: 'Comment on amt-2023-212', Anonymous Referee #1, 29 Jan 2024 reply
Johanna Pedersen, Sasha D. Hafner, Andreas Pacholski, Valthor I. Karlsson, Li Rong, Rodrigo Labouriau, and Jesper N. Kamp
Johanna Pedersen, Sasha D. Hafner, Andreas Pacholski, Valthor I. Karlsson, Li Rong, Rodrigo Labouriau, and Jesper N. Kamp

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Short summary
Field applied animal slurry is a significant source of NH3 emission. A new system of dynamic flux chambers for NH3 measurements was developed and validated through three field trials, used to assess the variability after application with trailing hose at different scales: manual (handheld), 3-m slurry boom, and 30-m slurry boom. The measurement system facilitates NH3 emission measurement with replication after both manual and farm-scale slurry application with relatively high precision.