Articles | Volume 18, issue 12
Biogeosciences, 18, 3961–3979, 2021
https://doi.org/10.5194/bg-18-3961-2021
Biogeosciences, 18, 3961–3979, 2021
https://doi.org/10.5194/bg-18-3961-2021
Research article
01 Jul 2021
Research article | 01 Jul 2021

Methane in the Danube Delta: the importance of spatial patterns and diel cycles for atmospheric emission estimates

Anna Canning et al.

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Cited articles

Abril, G. and Borges, A. V. (Eds.): Carbon dioxide and methane emissions from estuaries, in: Greenhouse gas emissions – fluxes and processes, Springer, Berlin, Heidelberg, Germany, 187–207, https://doi.org/10.1007/978-3-540-26643-3_8, 2005. 
Abril, G. and Borges, A. V.: Ideas and perspectives: Carbon leaks from flooded land: do we need to replumb the inland water active pipe?, Biogeosciences, 16, 769–784, https://doi.org/10.5194/bg-16-769-2019, 2019. 
Bange, H. W., Sim, C. H., Bastian, D., Kallert, J., Kock, A., Mujahid, A., and Müller, M.: Nitrous oxide (N2O) and methane (CH4) in rivers and estuaries of northwestern Borneo, Biogeosciences, 16, 4321–4335, https://doi.org/10.5194/bg-16-4321-2019, 2019. 
Bastviken, D., Cole, J. J., Pace, M. L., and Van de-Bogert, M. C.: Fates of methane from different lake habitats: Connecting whole-lake budgets and CH4 emissions, J. Geophys. Res.-Biogeo., 113, G02024, https://doi.org/10.1029/2007JG000608, 2008. 
Bastviken, D., Tranvik, L. J., Downing, J. A., Crill, P. M., and Enrich-Prast, A.: Freshwater methane emissions offset the continental carbon sink, Science, 331, p. 50, https://doi.org/10.1126/science.1196808, 2011. 
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Inland waters are usually not well restrained in terms of greenhouse gas measurements. One of these regions is the Danube Delta, Romania. Therefore, we measured continuously with sensors to collect high-resolution data for CH4 and O2 throughout the Delta. We found significant variation for all concentrations over the day and night and between regions, as well as large spatial variation throughout all regions, with large CH4 concentrations flowing in from the reed beds to the lakes.
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