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  • 1
    Electronic Resource
    Electronic Resource
    The marine source of C2-C6 aliphatic hydrocarbons (1988)
    Springer
    Journal of atmospheric chemistry 6 (1988), S. 3-20 
    Details
    ISSN: 1573-0662
    Keywords: Nonmethane hydrocarbons ; sea-air exchanges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract C2-C6 Nonmethane hydrocarbon (NMHC) concentrations in the atmospheric boundary layer and in surface seawater were simultaneously measured during an oceanographic cruise in the intertropical Indian Ocean. NMHC were found to be mainly C2-C4 alkenes and C2-C3 alkanes. Their concentrations ranged from 1 to 30×10−9 l/l in the seawater and 0.1 to 15 ppbv in the atmosphere. Seawater appeared to be a source because the C2-C6 NMHC were supersaturated with respect to the atmosphere by 2 or 3 orders of magnitude. After a selection of the pure marine atmospheric samples, performed with the help of stable and radioactive continental tracers, we found an identical composition in NMHC of surface air and seawater. This observation enabled us to establish that the gas transfer between sea and air occurred according to nonsteady state processes, and that the fluxes cannot be deduced only from atmospheric measurements. An order of magnitude value of the oceanic source for the different NMHC is however derived from the comparison of their sea water concentrations to that of propane and an independent evluation of the marine source of this last compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048328
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  • 2
    Electronic Resource
    Electronic Resource
    NMHC in the marine atmosphere: Preliminary results of monitoring at Amsterdam Island (1990)
    Springer
    Journal of atmospheric chemistry 11 (1990), S. 169-178 
    Details
    ISSN: 1573-0662
    Keywords: Nonmethane hydrocarbons ; tropospheric chemistry ; background pollution ; air-sea exchanges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Between January 1984 and May 1987, C2 to C5 NMHC concentrations, and Radon-222 activities were measured at Amsterdam Island in the Indian Ocean. A large variability of about one order of magnitude was observed in the NMHC concentrations. Most of the samples were collected under marine influence. Using ethene as a reference compound for marine emissions, it appears that the NMHC/ethene composition of the air and its variability directly reflect the composition of dissolved gases in surface seawater. Only the ethane/ethene ratio presents a significant deviation from this typical composition and this can be attributed to a continental component. At sea level, the reation frequency of OH radicals with the NMHC is similar to that of methane and carbon monoxide. Thus, the contribution of marine NMHC should be taken into account in the modelling of oxidants in remote atmospheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053673
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