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Methane isotopes in the atmosphere can help us differentiate between emission processes. A large variety of natural and anthropogenic emission types are active in the Arctic and are unsatisfactorily understood and documented up to now. A ship-based campaign was carried out in summer 2014, providing a unique dataset of isotopic measurements in the Arctic Ocean. Using a chemistry-transport model, we link these measurements to circumpolar emissions and retrieve information about their signature.
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ACP | Articles | Volume 20, issue 6
Atmos. Chem. Phys., 20, 3987–3998, 2020
https://doi.org/10.5194/acp-20-3987-2020
Atmos. Chem. Phys., 20, 3987–3998, 2020
https://doi.org/10.5194/acp-20-3987-2020

Research article 02 Apr 2020

Research article | 02 Apr 2020

Using ship-borne observations of methane isotopic ratio in the Arctic Ocean to understand methane sources in the Arctic

Antoine Berchet et al.

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Cited articles

Arora, V. K., Berntsen, T., Biastock, A., Bousquet, P., Bruhwiler, L., Bush, E., Chan, E., Christensen, T. R., Dlugokencky, E., Fisher, R. E., France, J., Gauss, M., Höglund-Isaksson, L., Houweling, S., Huissteden, K., and Janssens-Maenhout, G.: AMAP, 2015. AMAP Assessment 2015: Methane as an Arctic climate forcer, Tech. Rep., Arctic Monitoring and Assessment Programme (AMAP), Oslo, Norway, available at: https://www.amap.no/documents/doc/amap-assessment-2015-methane-as-an-arctic-climate-forcer/1285 (last access: 9 March 2020), 2015. a
Arshinov, M. Y., Belan, B. D., Davydov, D. K., Inouye, G., Krasnov, O. A., Maksyutov, S., Machida, T., Fofonov, A. V., and Shimoyama, K.: Spatial and temporal variability of CO2 and CH4 concentrations in the surface atmospheric layer over West Siberia, Atmos. Ocean Opt., 22, 84–93, https://doi.org/10.1134/S1024856009010126, 2009. a
Berchet, A., Pison, I., Chevallier, F., Paris, J.-D., Bousquet, P., Bonne, J.-L., Arshinov, M. Y., Belan, B. D., Cressot, C., Davydov, D. K., Dlugokencky, E. J., Fofonov, A. V., Galanin, A., Lavriĉ, J., Machida, T., Parker, R., Sasakawa, M., Spahni, R., Stocker, B. D., and Winderlich, J.: Natural and anthropogenic methane fluxes in Eurasia: a mesoscale quantification by generalized atmospheric inversion, Biogeosciences, 12, 5393–5414, https://doi.org/10.5194/bg-12-5393-2015, 2015. a, b
Berchet, A., Bousquet, P., Pison, I., Locatelli, R., Chevallier, F., Paris, J.-D., Dlugokencky, E. J., Laurila, T., Hatakka, J., Viisanen, Y., Worthy, D. E. J., Nisbet, E., Fisher, R., France, J., Lowry, D., Ivakhov, V., and Hermansen, O.: Atmospheric constraints on the methane emissions from the East Siberian Shelf, Atmos. Chem. Phys., 16, 4147–4157, https://doi.org/10.5194/acp-16-4147-2016, 2016. a, b, c, d
Bohn, T. J., Melton, J. R., Ito, A., Kleinen, T., Spahni, R., Stocker, B. D., Zhang, B., Zhu, X., Schroeder, R., Glagolev, M. V., Maksyutov, S., Brovkin, V., Chen, G., Denisov, S. N., Eliseev, A. V., Gallego-Sala, A., McDonald, K. C., Rawlins, M. A., Riley, W. J., Subin, Z. M., Tian, H., Zhuang, Q., and Kaplan, J. O.: WETCHIMP-WSL: intercomparison of wetland methane emissions models over West Siberia, Biogeosciences, 12, 3321–3349, https://doi.org/10.5194/bg-12-3321-2015, 2015. a
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Short summary
Methane isotopes in the atmosphere can help us differentiate between emission processes. A large variety of natural and anthropogenic emission types are active in the Arctic and are unsatisfactorily understood and documented up to now. A ship-based campaign was carried out in summer 2014, providing a unique dataset of isotopic measurements in the Arctic Ocean. Using a chemistry-transport model, we link these measurements to circumpolar emissions and retrieve information about their signature.
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Final-revised paper
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