Articles | Volume 11, issue 1
Earth Syst. Sci. Data, 11, 1–22, 2019
https://doi.org/10.5194/essd-11-1-2019
Earth Syst. Sci. Data, 11, 1–22, 2019
https://doi.org/10.5194/essd-11-1-2019

Peer-reviewed comment 07 Jan 2019

Peer-reviewed comment | 07 Jan 2019

Gridded maps of geological methane emissions and their isotopic signature

Giuseppe Etiope et al.

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Cited articles

Aliyev, A. A., Guliyev, I. S., and Feyzullayev, A. A.: What do we know about mud volcanoes Azerbaijan National Academy of Sciences Geology Institute, Qoliaf qrup QSC, Baku, 206 pp., 2012. 
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. 
Bergamaschi, P., Houweling, S., Segers, A., Krol, M., Frankenberg, C., Scheepmaker, R. A., Dlugokencky, E., Wofsy, S. C., Kort, E. A., Sweeney, C., Schuck, T., Brenninkmeijer, C., Chen, H., Beck, V., and Gerbig, C.: Atmospheric CH4 in the first decade of the 21st century: Inverse modeling analysis using SCIAMACHY satellite retrievals and NOAA surface measurements, J. Geophys. Res.-Atmos., 118, 7350–7369, https://doi.org/10.1002/jgrd.50480, 2013. 
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Short summary
We developed the first global maps of natural geological CH4 flux and isotopic values which can be used for new atmospheric CH4 modelling. The maps, based on updated, measured and theoretically estimated data, show that the highest geo-CH4 emissions are located in the Northern Hemisphere (N. America, Caspian region, Europe, Siberian Arctic Shelf), and that geo-CH4 is less 13C-enriched than what has been assumed so far in other studies. Other CH4 sources can now be estimated with higher accuracy.