Abstract:
:Free hydrogen (H2) is a basal energy source underlying chemosynthetic activity within igneous ocean crust. In an attempt to systematically account for all H2 within young oceanic lithosphere (<10 Ma) near the Mid-Ocean Ridge (MOR), we construct a box model of this environment. Within this control volume, we assess abiotic H2 sources (∼6 × 1012 mol H2/y) and sinks (∼4 × 1012 mol H2/y) and then attribute the net difference (∼2 × 1012 mol H2/y) to microbial consumption in order to balance the H2 budget. Despite poorly constrained details and large uncertainties, our analytical framework allows us to synthesize a vast body of pertinent but currently disparate information in order to propose an initial global estimate for microbial H2 consumption within young ocean crust that is tractable and can be iteratively improved upon as new data and studies become available. Our preliminary investigation suggests that microbes beneath the MOR may be consuming a sizeable portion (at least ∼30%) of all produced H2, supporting the widely held notion that subseafloor microbes voraciously consume H2 and play a fundamental role in the geochemistry of Earth's ocean-atmosphere system.
journal_name
Proc Natl Acad Sci U S Aauthors
Worman SL,Pratson LF,Karson JA,Schlesinger WHdoi
10.1073/pnas.2002619117subject
Has Abstractpub_date
2020-06-16 00:00:00pages
13283-13293issue
24eissn
0027-8424issn
1091-6490pii
2002619117journal_volume
117pub_type
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