| Summary: | Progress Code: onGoing Maintenance and Update Frequency: continual Statement: Samples were analysed by gas chromatography with a mercuric oxide reduction gas detector. Data are reported in the CSIRO94 H2 scale which was defined by dilution of high purity H2 and CH4 (in a 1:3 ratio) with zero air to produce a mixture with H2 mole fraction close to atmospheric levels, and “bootstrapping” to a gravimetrically-derived, absolute CH4 scale. Flask data are assigned flags to indicate whether they are classified as retained or rejected. Monthly means are calculated as the mean of daily values from a smooth curve fit to the data using the curve-fitting routines described by Thoning et al. (1989). Credit CSIRO - Marine and Atmospheric Research (CMAR), Australian Bureau of Meteorology (BoM), Australian Antarctic Division (AAD), Australian Institute of Marine Science (AIMS), National Oceanic and Atmospheric Administration (NOAA), Environment Canada (EC). Credit Paul Krummel (CSIRO) Credit Paul Steele (CSIRO) Credit Ray Langenfelds(CSIRO). The CSIRO Global Atmospheric Sampling Laboratory (GASLAB) Flask Sampling Network archive for the atmospheric trace gas hydrogen (H2) concentrations. GASLAB principally analyzes air samples that have been captured at eleven fixed geographic sites and one moving (aircraft over bass strait and Cape Grim), but also includes other sites at various locations globally on a less regular or as needed basis. The flask air sample is analyzed for the 5 atmospheric trace gases Methane (CH4), Carbon Dioxide (CO2), Carbon Monoxide (CO), Hydrogen (H2) and N2O (Nitrous Oxide). Data about the relative concentrations of these are particularly important for Global Warming studies as CO2 and CH4 are the two most effective anthropogenic greenhouse gases; CO and H2 influencing concentrations of the hydroxyl radical (OH), thereby affecting the main sink for atmospheric CH4. H2 is produced in a sequence of reactions following the reaction of OH with CH4. Measurements for H2 concentrations are made ...
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