Articles | Volume 16, issue 17
https://doi.org/10.5194/amt-16-4053-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-16-4053-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
08 Sep 2023
Research article |
| 08 Sep 2023
| 08 Sep 2023
Open-path measurement of stable water isotopologues using mid-infrared dual-comb spectroscopy
Daniel I. Herman
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America
Griffin Mead
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Fabrizio R. Giorgetta
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America
Esther Baumann
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America
Nathan A. Malarich
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Brian R. Washburn
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America
Nathan R. Newbury
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Ian Coddington
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America
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Chinthaka Weerasekara, Lindsay C. Morris, Nathan A. Malarich, Fabrizio R. Giorgetta, Daniel I. Herman, Kevin C. Cossel, Nathan R. Newbury, Clenton E. Owensby, Stephen M. Welch, Cosmin Blaga, Brett D. DePaola, Ian Coddington, Brian R. Washburn, and Eduardo A. Santos
Atmos. Meas. Tech., 17, 6107–6117, https://doi.org/10.5194/amt-17-6107-2024, https://doi.org/10.5194/amt-17-6107-2024, 2024
Short summary
Short summary
Most methane emissions during the life cycle of beef cattle occur during the grazing phase. Measuring methane in grazing systems is difficult due to the high mobility and low density of animals. This work investigates if dual-comb spectroscopy can measure methane emissions from small cattle herds. An enhancement of 10 nmol mol-1 methane above the atmospheric background was measured, equivalent to 20 head located 60 m away. The calculated methane flux was within 5 % of the actual release rate.
Kevin C. Cossel, Eleanor M. Waxman, Eli Hoenig, Daniel Hesselius, Christopher Chaote, Ian Coddington, and Nathan R. Newbury
Atmos. Meas. Tech., 16, 5697–5707, https://doi.org/10.5194/amt-16-5697-2023, https://doi.org/10.5194/amt-16-5697-2023, 2023
Short summary
Short summary
Measurements of the emission rate of a gas or gases from point and area sources are important in a range of monitoring applications. We demonstrate a method for rapid quantification of the emission rate of multiple gases using a spatially scannable open-path sensor. The open-path spectrometer measures the total column density of gases between the spectrometer and a retroreflector mounted on an uncrewed aerial vehicle (UAV). By scanning the UAV altitude, we can determine the total gas emissions.
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Short summary
Measurements of the isotope ratio of water vapor provide information about the sources and history of water vapor at a given location, which can be used to understand the impacts of climate change on global water use. Here, we demonstrate a new method for measuring isotope ratios over long open-air paths, which can reduce sampling bias and provide more spatial averaging than standard point sensor methods. We show that this new technique has high sensitivity and accuracy.
Measurements of the isotope ratio of water vapor provide information about the sources and...
