Articles | Volume 13, issue 1
https://doi.org/10.5194/bg-13-323-2016
https://doi.org/10.5194/bg-13-323-2016
Research article
 | 
15 Jan 2016
Research article |  | 15 Jan 2016

Isotopic evidence for biogenic molecular hydrogen production in the Atlantic Ocean

S. Walter, A. Kock, T. Steinhoff, B. Fiedler, P. Fietzek, J. Kaiser, M. Krol, M. E. Popa, Q. Chen, T. Tanhua, and T. Röckmann

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Short summary
Oceans are a source of H2, an indirect greenhouse gas. Measurements constraining the temporal and spatial patterns of oceanic H2 emissions are sparse and although H2 is assumed to be produced mainly biologically, direct evidence for biogenic marine production was lacking. By analyzing the H2 isotopic composition (δD) we were able to constrain the global H2 budget in more detail, verify biogenic production and point to additional sources. We also showed that current models are reasonably working.
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