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  • 1
    Electronic Resource
    Electronic Resource
    Pollutant wet deposition mechanisms in precipitation and fog water (1986)
    Springer
    Water, air & soil pollution 30 (1986), S. 91-104 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Wet deposition of acid-related substances takes place by two processes: precipitation scavenging and fog water impaction/sedimentation on natural surfaces. The relative importance of each deposition pathway depends on the frequency of occurrence of precipitation or fog, the magnitude of the event and the efficiency of pollutant removal by each mechanism. The latter, in turn, is governed by the type of cloud or fog, complex precipitation formation mechanisms and cloud-surface interactions. These factors are examined in the light of our current knowledge. Particular emphasis is placed on how cloud micro-physical as well as air and precipitation measurements, made aloft by aircraft and at the ground, have been used to further our knowledge of wet deposition mechanisms. Future research is needed to quantify the importance of the fog-water deposition pathway in eastern North America to better understand the interaction of gaseous pollutants with cloud and fog-water and to improve our knowledge of pollutant scavenging processes in mesoscale and synoptic weather systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305178
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Soil acidification along a topographic gradient on Roundtop Mountain, Quebec, Canada (1992)
    Springer
    Water, air & soil pollution 61 (1992), S. 235-242 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We examined the effects that different acidic loadings have had on soil chemistry along a toposequence on Roundtop Mountain. Due to fog interception by the forest canopy, the amount of time in the clouds is a major factor determining the amount and chemistry of precipitation reaching the soil and hence, acid precipitation loading is directly related to elevation. Soils on a transect from 520 to 850 m show a pattern of chemistry that corresponds to the loading of acidic deposition. Soil solutions collected at two elevations show different levels of both SO4 and Cl, two of the anions in fog water as well as differences in concentrations of H ion and Al. Surface horizons of soils located at 850 m have pH in water as low as 3.7; in mineral horizons base saturation is extremely low (〈5%) and Al saturation exceeds 95% in many cases. In contrast, lower on the mountain slope (below 650 m), pH is slightly higher (about 4.1) and base saturation rises to over 50% for the same soil horizons. There is a clear relationship between soil acidification and position on the mountain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00482607
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Trace metal contamination in and on Balsam fir (abies Balsamea (L) Mill.) Foliage in southern Quebec, Canada (1995)
    Springer
    Water, air & soil pollution 81 (1995), S. 175-191 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Atmospheric trace metal contamination in and on forest foliage in southern Quebec has been investigated. Washed and unwashed foliage of Balsam fir from seven sampling sites with different elevation were analyzed by NAA. Metal element concentrations in needles were generally well below the suggested levels of potential phytotoxicity, except for Mn. At three rural mountain sampling locations, Mn concentration exceed 600 μg/g in washed and unwashed needles. The variability of metal concentrations between individual trees at a given site showed the expected element-specific differences, with most CV's 〈 50%. The variation of metal deposits on needle surfaces (ng/cm2) with elevation and sampling site depended on the element concerned. The input of Al, As, Cr, La, Sb, Sc, Sm, and V, accompanying Fe in deposits on the foliage surface, may mainly come from atmospheric deposition in the form of soil dust and air pollution. Wet deposition samples from Roundtop Mountain suggest cloud immersion as a significant trace element deposition pathway in high elevation forest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00477264
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    Paper (German National Licenses)
    Fulltext
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