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Isotopic evidence for biogenic molecular hydrogen production in the Atlantic Ocean

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Figure 1. (a) cruise tracks of the RV Polarstern, dots indicate positions of discrete atmospheric air sampling, (b) positions of surface waterheadspace sampling during ANT-XXVI/4 (n = 16, green dots) and the RV L’Atalante ATA-3 cruise (n = 6, black dots).
Figure 2. Experimental setup for headspace sampling,rosette, (a) sampling of the surface water into the glass vessel, connected to the Niskin bottle (b) scheme of the experimental setup.
Figure 3. Comparing the Hthe isotopic experimental setup (1 RGA ((yellow labeled),2 mole fractions (ppb) measured withx axis) and the Peak Performery axis) during ANT-XXVI/1 (red labeled) and ANT-XXV/5 y = 0.979x+ 3.96, R2 = 0.81, n = 147.
Table 2. Hemispheric means of atmospheric H2 and its isotopic composition along the four meridional Atlantic transects.
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