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  • 1
    Electronic Resource
    Electronic Resource
    Arctic springtime depletion of mercury (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 331-332 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Arctic ecosystem is showing increasing evidence of contamination by persistent, toxic substances, including metals such as mercury, that accumulate in organisms. In January 1995, we began continuous surface-level measurements of total gaseous mercury in the air at Alert, Northwest ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/28530
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Atmospheric nitrogen species and regional air mass characterizations in Southern Ontario
    Amsterdam : Elsevier
    Journal of Photochemistry 17 (1981), S. 125 
    Details
    ISSN: 0047-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0047-2670(81)85242-2
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Some measurements of air quality and precipitation in Saint John, N.B. (1976)
    Springer
    Water, air & soil pollution 5 (1976), S. 507-514 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract For the period of November 19 to 23, 1973, and July 13 to 23, 1974, air quality and precipitation measurements were made in and around Saint John, New Brunswick. For both periods it was found that SO2 concentrations could be appreciable at several locations (with hourly maxima near 40 pphm). Sulfur dioxide fumigation from a power plant plume and H2S concentrations near a Kraft process pulp and paper mill are discussed. For the July period, O3, NO and NO2 were measured in the background air as well as in air downwind of the city. The ambient concentrations were not unusually high, with the O3 reaching levels up to 8 pphm (hourly average) on clear sunny days. Precipitation samples were collected on several occasions and the analyses indicate that concentrations of acid-forming species were not markedly different from those found in other Canadian cities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280850
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Is the Arctic Surface Layer a Source and Sink of NOx in Winter/Spring? (2000)
    Springer
    Journal of atmospheric chemistry 36 (2000), S. 1-22 
    Details
    ISSN: 1573-0662
    Keywords: active nitrogen ; ozone ; radicals ; snow chemistry ; Arctic ; surface layer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Measurements of NOx (NO +NO2) and the sum of reactive nitrogenconstituents, NOy, were made near the surface atAlert (82.5°N), Canada during March and April1998. In early March when solar insolation was absentor very low, NOx mixing ratios were frequentlynear zero. After polar sunrise when the sun was abovethe horizon for much or all of the day a diurnalvariation in NOx and NOy was observed withamplitudes as large as 30–40 pptv. The source ofactive nitrogen is attributed to release from the snowsurface by a process that is apparently sensitized bysunlight. If the source from the snowpack is a largescale feature of the Arctic then the diurnal trendsalso require a competing process for removal to thesurface. From the diurnal change in the NO/NO2ratio, mid-April mixing ratios for the sum of peroxyand halogen oxide radicals of ≤10 pptv werederived for periods when ozone mixing ratios were inthe normal range of 30–50 ppbv. Mid-day ozoneproduction and loss rates with the active nitrogensource were estimated to be ∼1–2 ppbv/day and in nearbalance. NOy mixing ratios which averaged only295±66 pptv do not support a large accumulation inthe high Arctic surface layer in the winter and springof 1998. The small abundance of NOy relative tothe elevated mixing ratios of other long-livedanthropogenic constituents requires that reactivenitrogen be removed to the surface during transport toor during residence within the high Arctic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006301029874
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  • 5
    Electronic Resource
    Electronic Resource
    A comparison of summer and winter measurements of atmospheric nitrogen and sulphur compounds (1986)
    Springer
    Water, air & soil pollution 30 (1986), S. 153-160 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Summer and winter concentrations of acidic atmospheric species and their precursors were measured in central Ontario. Large seasonal differences in concentrations were observed for some species. The concentrations of primary emission species, S02 and NOx, were much larger in winter, whereas 03 and aerosol S04 were much reduced. HN03, PAN and aerosol N03 showed little seasonal change; PAN represented about 30% of the total oxidized nitrate. During pollution episodes and in summer, the molar ratio of nitrate (aerosol N03 plus HN03) to aerosol S04 was about 0.1 to 0.2; however, during winter, this molar ratio was about 1 to 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305184
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  • 6
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    Impacts of midlatitude precursor emissions and local photochemistry on ozone abundances in the Arctic (2012)
    American Geophysical Union
    In:  EPIC3Journal of Geophysical Research., American Geophysical Union, 117(D01305), pp. 1-17, ISSN: 0148-0227
    Details
    Publication Date: 2019-07-17
    Description: We assess the impact of transport of pollution from midlatitudes on the abundance of ozone in the Arctic in summer 2006 using the GEOS-Chem global chemical transport model and its adjoint. We find that although the impact of midlatitude emissions on ozone abundances in the Arctic is at a maximum in fall and winter, in July transport from North America, Asia, and Europe together contributed about 25% of surface ozone abundances in the Arctic. Throughout the summer, the dominant source of ozone in the Arctic troposphere was photochemical production within the Arctic, which accounted for more than 50% of the ozone in the Arctic boundary layer and as much as 30%–40% of the ozone in the middle troposphere. An adjoint sensitivity analysis of the impact of NOx emissions on ozone at Alert shows that on synoptic time scales in both the lower and middle troposphere, ozone abundances are more sensitive to emissions between 50°N and 70°N, with important influences from anthropogenic, biomass burning, soil, and lightning sources. Although local surface NOx emissions contribute to ozone formation, transport of NOx in the form of peroxyacetyl nitrate (PAN) from outside the Arctic and from the upper troposphere also contributed to ozone production in the lower troposphere. We find that in late May and June the release of NOx from PAN decomposition accounted for 93% and 55% of ozone production at the Arctic surface, respectively.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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