2016
DOI: 10.5194/bg-13-323-2016
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Isotopic evidence for biogenic molecular hydrogen production in the Atlantic Ocean

Abstract: Abstract. Oceans are a net source of molecular hydrogen (H2) to the atmosphere. The production of marine H2 is assumed to be mainly biological by N2 fixation, but photochemical pathways are also discussed. We present measurements of mole fraction and isotopic composition of dissolved and atmospheric H2 from the southern and northern Atlantic between 2008 and 2010. In total almost 400 samples were taken during 5 cruises along a transect between Punta Arenas (Chile) and Bremerhaven (Germany), as well as at the c… Show more

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Cited by 13 publications
(3 citation statements)
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“…To do so, we performed side-by-side Trace gases may be important energy sources for oceanic bacteria since they are generally available at elevated concentrations relative to the atmosphere, in contrast to most soils 1 . Surface layers of the world's oceans are generally supersaturated with H 2 and CO, typically by 2-to 5-fold (up to 15-fold) and 20-to 200-fold (up to 2,000-fold) relative to the atmosphere, respectively [14][15][16][17] . As a result, oceans contribute to net atmospheric emissions of these gases 18,19 .…”
Section: Articlementioning
confidence: 99%
“…To do so, we performed side-by-side Trace gases may be important energy sources for oceanic bacteria since they are generally available at elevated concentrations relative to the atmosphere, in contrast to most soils 1 . Surface layers of the world's oceans are generally supersaturated with H 2 and CO, typically by 2-to 5-fold (up to 15-fold) and 20-to 200-fold (up to 2,000-fold) relative to the atmosphere, respectively [14][15][16][17] . As a result, oceans contribute to net atmospheric emissions of these gases 18,19 .…”
Section: Articlementioning
confidence: 99%
“…Laser spectroscopy has been a widely used research tool to determine the ratio of stable isotopes of elements such as carbon, oxygen, nitrogen, and hydrogen within organic or inorganic samples. Determination of these isotope ratios is important in a variety of applications in physical, geological, and atmospheric research, palaeontological processes, and climate and paleoclimate studies. In atmospheric research, isotope ratio measurements are important in establishing the global atmospheric budgets and constraints in a variety of atmospheric models. , As valid alternatives to isotope ratio mass spectrometry (IRMS), laser spectroscopic techniques provide an inexpensive, effective, and more widely available approach for isotope analysis, especially since isotopologues with the same nominal mass often have nonoverlapping absorption spectra. Further, laser-based spectrometers provide greater flexibility when performing temperature-dependent studies or studies compatible with condensable gases such as water.…”
Section: Introductionmentioning
confidence: 99%
“…Recently, it became possible to analyze the D content of H 2 (δD) in small atmospheric samples at natural isotopic abundances . These measurements enabled the study of different components of the H 2 cycle and helped constrain the atmospheric H 2 budget, which as a consequence is currently relatively well understood on the large scale . Although H 2 isotope measurements have proven useful, they are difficult to perform, and only few labs had or have this capability.…”
Section: Background and Introductionmentioning
confidence: 99%