Articles | Volume 13, issue 9
https://doi.org/10.5194/amt-13-4715-2020
© Author(s) 2020. 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-13-4715-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
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07 Sep 2020
Research article | Highlight paper |
| 07 Sep 2020
| 07 Sep 2020
A compact QCL spectrometer for mobile, high-precision methane sensing aboard drones
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
Manuel Graf
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
Jonas Ravelid
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
Philipp Scheidegger
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
André Kupferschmid
Transport at Nanoscale Interfaces, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
Herbert Looser
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
Randulph Paulo Morales
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
Lukas Emmenegger
Laboratory for Air Pollution/Environmental Technology, Empa – Swiss Federal Laboratory for Materials Science and Technology, Überlandstraße 129, Dübendorf 8600, Switzerland
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Atmos. Chem. Phys., 22, 10721–10749, https://doi.org/10.5194/acp-22-10721-2022, https://doi.org/10.5194/acp-22-10721-2022, 2022
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Randulph Morales, Jonas Ravelid, Katarina Vinkovic, Piotr Korbeń, Béla Tuzson, Lukas Emmenegger, Huilin Chen, Martina Schmidt, Sebastian Humbel, and Dominik Brunner
Atmos. Meas. Tech., 15, 2177–2198, https://doi.org/10.5194/amt-15-2177-2022, https://doi.org/10.5194/amt-15-2177-2022, 2022
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Dominique Rust, Ioannis Katharopoulos, Martin K. Vollmer, Stephan Henne, Simon O'Doherty, Daniel Say, Lukas Emmenegger, Renato Zenobi, and Stefan Reimann
Atmos. Chem. Phys., 22, 2447–2466, https://doi.org/10.5194/acp-22-2447-2022, https://doi.org/10.5194/acp-22-2447-2022, 2022
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Artificial halocarbons contribute to ozone layer depletion and to global warming. We measured the atmospheric concentrations of halocarbons at the Beromünster tower, modelled the Swiss emissions, and compared the results to the internationally reported Swiss emissions inventory. For most of the halocarbons, we found good agreement, whereas one refrigerant might be overestimated in the inventory. In addition, we present first emission estimates of the newest types of halocarbons.
Stuart K. Grange, James D. Lee, Will S. Drysdale, Alastair C. Lewis, Christoph Hueglin, Lukas Emmenegger, and David C. Carslaw
Atmos. Chem. Phys., 21, 4169–4185, https://doi.org/10.5194/acp-21-4169-2021, https://doi.org/10.5194/acp-21-4169-2021, 2021
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The changes in mobility across Europe due to the COVID-19 lockdowns had consequences for air quality. We compare what was experienced to estimates of "what would have been" without the lockdowns. Nitrogen dioxide (NO2), an important vehicle-sourced pollutant, decreased by a third. However, ozone (O3) increased in response to lower NO2. Because NO2 is decreasing over time, increases in O3 can be expected in European urban areas and will require management to avoid future negative outcomes.
Manuel Graf, Philipp Scheidegger, André Kupferschmid, Herbert Looser, Thomas Peter, Ruud Dirksen, Lukas Emmenegger, and Béla Tuzson
Atmos. Meas. Tech., 14, 1365–1378, https://doi.org/10.5194/amt-14-1365-2021, https://doi.org/10.5194/amt-14-1365-2021, 2021
Short summary
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Bernhard Bereiter, Béla Tuzson, Philipp Scheidegger, André Kupferschmid, Herbert Looser, Lars Mächler, Daniel Baggenstos, Jochen Schmitt, Hubertus Fischer, and Lukas Emmenegger
Atmos. Meas. Tech., 13, 6391–6406, https://doi.org/10.5194/amt-13-6391-2020, https://doi.org/10.5194/amt-13-6391-2020, 2020
Short summary
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The record of past greenhouse gas composition from ice cores is crucial for our understanding of global climate change. Deciphering this archive requires highly accurate and spatially resolved analysis of the very small amount of gas that is trapped in the ice. This is achieved with a mid-IR laser absorption spectrometer that provides simultaneous, high-precision measurements of CH4, N2O, CO2, and δ13C(CO2) and which will be coupled to a quantitative sublimation extraction method.
Cited articles
Anfossi, D., Alessandrini, S., Trini Castelli, S., Ferrero, E., Oettl, D., and
Degrazia, G.: Tracer dispersion simulation in low wind speed conditions with
a new 2D Langevin equation system, Atmos. Environ., 40, 7234–7245,
https://doi.org/10.1016/j.atmosenv.2006.05.081, 2006. a
Berman, E. S., Fladeland, M., Liem, J., Kolyer, R., and Gupta, M.: Greenhouse
gas analyzer for measurements of carbon dioxide, methane, and water vapor
aboard an unmanned aerial vehicle, Sensor Actuators B-Chem., 169,
128–135, https://doi.org/10.1016/j.snb.2012.04.036, 2012. a, b
DelSontro, T., McGinnis, D. F., Sobek, S., Ostrovsky, I., and Wehrli, B.:
Extreme Methane Emissions from a Swiss Hydropower Reservoir: Contribution
from Bubbling Sediments, Environ. Sci. Technol., 44, 2419–2425,
https://doi.org/10.1021/es9031369, 2010. a
Eng, R. S., Calawa, A. R., Harman, T. C., Kelley, P. L., and Javan, A.:
Collisional narrowing of infrared water-vapor transitions, Appl. Phys.
Lett., 21, 303–305, https://doi.org/10.1063/1.1654387, 1972. a
Fischer, M., Tuzson, B., Hugi, A., Bronnimann, R., Kunz, A., Blaser, S.,
Rochat, M., Landry, O., Muller, A., and Emmenegger, L.: Intermittent
operation of QC-lasers for mid-IR spectroscopy with low heat dissipation:
Tuning characteristics and driving electronics, Opt. Express, 22,
7014–7027, https://doi.org/10.1364/OE.22.007014, 2014. a
Fox, T., Barchyn, T., Risk, D., Ravikumar, A., and Hugenholtz, C.: A review of
close-range and screening technologies for mitigating fugitive methane
emissions in upstream oil and gas, Environ. Res. Lett., 14, 053002,
https://doi.org/10.1088/1748-9326/ab0cc3, 2019. a
Giesen, T., Schieder, R., Winnewisser, G., and Yamada, K.: Precise measurements
of pressure broadening and shift for several H2O lines in the ν2 band
by argon, nitrogen, oxygen, and air, J. Mol. Spectrosc., 153,
406–418, https://doi.org/10.1016/0022-2852(92)90485-7, 1992. a
Golston, L. M., Tao, L., Brosy, C., Schäfer, K., Wolf, B., McSpiritt, J.,
Buchholz, B., Caulton, D. R., Pan, D., Zondlo, M. A., Yoel, D., Kunstmann,
H., and McGregor, M.: Lightweight mid-infrared methane sensor for unmanned
aerial systems, Appl. Phys. B, 123, 170,
https://doi.org/10.1007/s00340-017-6735-6, 2017. a, b
Golston, L. M., Aubut, N. F., Frish, M. B., Yang, S., Talbot, R. W.,
Gretencord, C., McSpiritt, J., and Zondlo, M. A.: Natural Gas Fugitive Leak
Detection Using an Unmanned Aerial Vehicle: Localization and Quantification
of Emission Rate, Atmosphere, 9, 333, https://doi.org/10.3390/atmos9090333, 2018. a
Gordon, I. E., Rothman, L. S., Hill, C., Kochanov, R. V., Tan, Y., Bernath,
P. F., Birk, M., Boudon, V., Campargue, A., Chance, K. V., Drouin, B. J.,
Flaud, J. M., Gamache, R. R., Hodges, J. T., Jacquemart, D., Perevalov,
V. I., Perrin, A., Shine, K. P., Smith, M. A. H., Tennyson, J., Toon, G. C.,
Tran, H., Tyuterev, V. G., Barbe, A., Császár, A. G., Devi, V. M.,
Furtenbacher, T., Harrison, J. J., Hartmann, J. M., Jolly, A., Johnson,
T. J., Karman, T., Kleiner, I., Kyuberis, A. A., Loos, J., Lyulin, O. M.,
Massie, S. T., Mikhailenko, S. N., Moazzen-Ahmadi, N., Müller, H. S. P.,
Naumenko, O. V., Nikitin, A. V., Polyansky, O. L., Rey, M., Rotger, M.,
Sharpe, S. W., Sung, K., Starikova, E., Tashkun, S. A., Auwera, J. V.,
Wagner, G., Wilzewski, J., Wcislo, P., Yu, S., and Zak, E. J.: The
HITRAN2016 molecular spectroscopic database, J. Quant.
Spectrosc. Ra. Trans., 203, 3–69,
https://doi.org/10.1016/j.jqsrt.2017.06.038, 2017. a, b
Graf, M., Emmenegger, L., and Tuzson, B.: Compact, circular, and optically
stable multipass cell for mobile laser absorption spectroscopy, Opt.
Lett., 43, 2434–2437, https://doi.org/10.1364/OL.43.002434, 2018. a
Graf, M., Scheidegger, P., Kupferschmid, A., Looser, H., Peter, T., Dirksen, R., Emmenegger, L., and Tuzson, B.: Compact and Lightweight Mid-IR Laser Spectrometer for Balloon-borne Water Vapor Measurements in the UTLS, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2020-243, in review, 2020. a
Kirschke, S., Bousquet, P., Ciais, P., Saunois, M., Canadell, J. G.,
Dlugokencky, E. J., Bergamaschi, P., Bergmann, D., Blake, D. R., Bruhwiler,
L., Cameron-Smith, P., Castaldi, S., Chevallier, F., Feng, L., Fraser, A.,
Heimann, M., Hodson, E. L., Houweling, S., Josse, B., Fraser, P. J., Krummel,
P. B., Lamarque, J.-F., Langenfelds, R. L., Le Quéré, C., Naik, V.,
O'Doherty, S., Palmer, P. I., Pison, I., Plummer, D., Poulter, B., Prinn,
R. G., Rigby, M., Ringeval, B., Santini, M., Schmidt, M., Shindell, D. T.,
Simpson, I. J., Spahni, R., Steele, L. P., Strode, S. A., Sudo, K., Szopa,
S., van der Werf, G. R., Voulgarakis, A., van Weele, M., Weiss, R. F.,
Williams, J. E., and Zeng, G.: Three decades of global methane sources and
sinks, Nat. Geosci., 6, 813, https://doi.org/10.1038/ngeo1955, 2013. a
Liu, C., Tuzson, B., Scheidegger, P., Looser, H., Bereiter, B., Graf, M.,
Hundt, M., Aseev, O., Maas, D., and Emmenegger, L.: Laser driving and data
processing concept for mobile trace gas sensing: Design and implementation,
Rev. Sci. Instrum., 89, 065107, https://doi.org/10.1063/1.5026546, 2018. a
Martinez, B., Miller, T. W., and Yalin, A. P.: Cavity Ring-Down Methane Sensor
for Small Unmanned Aerial Systems, Sensors, 20, 454, https://doi.org/10.3390/s20020454,
2020. a, b
Nathan, B. J., Golston, L. M., O’Brien, A. S., Ross, K., Harrison, W. A.,
Tao, L., Lary, D. J., Johnson, D. R., Covington, A. N., Clark, N. N., and
Zondlo, M. A.: Near-Field Characterization of Methane Emission Variability
from a Compressor Station Using a Model Aircraft, Environ. Sci.
Technol., 49, 7896–7903, https://doi.org/10.1021/acs.est.5b00705, 2015. a
O'Connor, F. M., Boucher, O., Gedney, N., Jones, C. D., Folberth, G. A.,
Coppell, R., Friedlingstein, P., Collins, W. J., Chappellaz, J., Ridley, J.,
and Johnson, C. E.: Possible role of wetlands, permafrost, and methane
hydrates in the methane cycle under future climate change: A review, Rev. Geophys., 48, RG4005, https://doi.org/10.1029/2010RG000326, 2010. a
Oettl, D., Sturm, P. J., Bacher, M., Pretterhofer, G., and Almbauer, R. A.: A
simple model for the dispersion of pollutants from a road tunnel portal,
Atmos. Environ., 36, 2943–2953, https://doi.org/10.1016/S1352-2310(02)00254-6,
2002. a
Satar, E., Berhanu, T. A., Brunner, D., Henne, S., and Leuenberger, M.: Continuous
Saunois, M., Bousquet, P., Poulter, B., Peregon, A., Ciais, P., Canadell, J. G., Dlugokencky, E. J., Etiope, G., Bastviken, D., Houweling, S., Janssens-Maenhout, G., Tubiello, F. N., Castaldi, S., Jackson, R. B., Alexe, M., Arora, V. K., Beerling, D. J., Bergamaschi, P., Blake, D. R., Brailsford, G., Brovkin, V., Bruhwiler, L., Crevoisier, C., Crill, P., Covey, K., Curry, C., Frankenberg, C., Gedney, N., Höglund-Isaksson, L., Ishizawa, M., Ito, A., Joos, F., Kim, H.-S., Kleinen, T., Krummel, P., Lamarque, J.-F., Langenfelds, R., Locatelli, R., Machida, T., Maksyutov, S., McDonald, K. C., Marshall, J., Melton, J. R., Morino, I., Naik, V., O'Doherty, S., Parmentier, F.-J. W., Patra, P. K., Peng, C., Peng, S., Peters, G. P., Pison, I., Prigent, C., Prinn, R., Ramonet, M., Riley, W. J., Saito, M., Santini, M., Schroeder, R., Simpson, I. J., Spahni, R., Steele, P., Takizawa, A., Thornton, B. F., Tian, H., Tohjima, Y., Viovy, N., Voulgarakis, A., van Weele, M., van der Werf, G. R., Weiss, R., Wiedinmyer, C., Wilton, D. J., Wiltshire, A., Worthy, D., Wunch, D., Xu, X., Yoshida, Y., Zhang, B., Zhang, Z., and Zhu, Q.: The global methane budget 2000–2012, Earth Syst. Sci. Data, 8, 697–751, https://doi.org/10.5194/essd-8-697-2016, 2016.
a
Shindell, D., Kuylenstierna, J., Vignati, E., Van Dingenen, R., Amann, M.,
Klimont, Z., Anenberg, S., Muller, N., Janssens-Maenhout, G., Raes, F.,
Schwartz, J., Faluvegi, G., Pozzoli, L., Kupiainen, K., Höglund-Isaksson,
L., Emberson, L., Streets, D., Ramanathan, V., Hicks, K., Oanh, N., Milly,
G., Williams, M., Demkine, V., and Fowler, D.: Simultaneously mitigating
near-term climate change and improving human health and food security,
Science, 335, 183–189, https://doi.org/10.1126/science.1210026, 2012. a
Villa, T., Gonzalez, F., Miljevic, B., Ristovski, Z. D., and Morawska, L.: An
overview of small unmanned aerial vehicles for air quality measurements:
Present applications and future prospectives, Sensors (Switzerland), 16,
1072, https://doi.org/10.3390/s16071072, 2016. a
Werle, P., Mücke, R., and Slemr, F.: The limits of signal averaging in
atmospheric trace-gas monitoring by tunable diode-laser absorption
spectroscopy (TDLAS), Appl. Phys. B, 57,
131–139, https://doi.org/10.1007/BF00425997, 1993. a
Yang, S., Talbot, R. W., Frish, M. B., Golston, L. M., Aubut, N. F., Zondlo,
M. A., Gretencord, C., and McSpiritt, J.: Natural Gas Fugitive Leak Detection
Using an Unmanned Aerial Vehicle: Measurement System Description and Mass
Balance Approach, Atmosphere, 9, 1072, https://doi.org/10.3390/atmos9100383, 2018. a
Short summary
We describe a lightweight (2 kg) mid-IR laser spectrometer for airborne, in situ atmospheric methane (CH4) measurements. The instrument, based on an open-path circular multipass cell, provides fast response (1 Hz) and sub-parts-per-billion precision. It can easily be mounted on a drone, giving access to highly resolved 4D (spatial and temporal) data. The performance was assessed during field deployments involving artificial CH4 releases and vertical concentration gradients in the PBL.
We describe a lightweight (2 kg) mid-IR laser spectrometer for airborne, in situ atmospheric...
