Precise multispecies agricultural gas flux determined using broadband open-path dual-comb spectroscopy
| Autor: | Kevin C. Cossel, Brian R. Washburn, Fabrizio R. Giorgetta, Nathan R. Newbury, Eleanor M. Waxman, Lindsay C. Hutcherson, Ian Coddington, Brett DePaola, Daniel I. Herman, Chinthaka Weerasekara, Gabriel M. Colacion, Stephen Welch, Eduardo A. Santos |
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| Rok vydání: | 2020 |
| Předmět: |
2. Zero hunger
Biogeochemical cycle Multidisciplinary 010504 meteorology & atmospheric sciences Parts-per notation SciAdv r-articles Agriculture Optics 010501 environmental sciences Atmospheric sciences 01 natural sciences Gas analyzer Methane Spectral line chemistry.chemical_compound chemistry 13. Climate action Calibration Environmental science Sensitivity (control systems) Spectroscopy Research Articles 0105 earth and related environmental sciences Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Open-path dual-comb spectroscopy measures multispecies livestock emissions, enabling future field-scale ecological studies. Advances in spectroscopy have the potential to improve our understanding of agricultural processes and associated trace gas emissions. We implement field-deployed, open-path dual-comb spectroscopy (DCS) for precise multispecies emissions estimation from livestock. With broad atmospheric dual-comb spectra, we interrogate upwind and downwind paths from pens containing approximately 300 head of cattle, providing time-resolved concentration enhancements and fluxes of CH4, NH3, CO2, and H2O. The methane fluxes determined from DCS data and fluxes obtained with a colocated closed-path cavity ring-down spectroscopy gas analyzer agree to within 6%. The NH3 concentration retrievals have sensitivity of 10 parts per billion and yield corresponding NH3 fluxes with a statistical precision of 8% and low systematic uncertainty. Open-path DCS offers accurate multispecies agricultural gas flux quantification without external calibration and is easily extended to larger agricultural systems where point-sampling-based approaches are insufficient, presenting opportunities for field-scale biogeochemical studies and ecological monitoring. |
| Databáze: | OpenAIRE |
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