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  • Arctic atmosphere  (1)
  • nephelometer  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Surface aerosol measurements at Barrow during AGASP-II (1989)
    Springer
    Journal of atmospheric chemistry 9 (1989), S. 213-224 
    Details
    ISSN: 1573-0662
    Keywords: Aerosols ; Barrow ; Arctic ; extinction coefficient ; condensation nuclei ; nephelometer ; aethalometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Measurements at Barrow during the second Arctic Gas and Aerosol Sampling Program (AGASP-II), conducted in April 1986, showed no rapid long-range transport from lower-latitude source regions to Barrow, and only limited vertical transport from above the boundary layer to the surface. New aerosol size distribution measurements in the 0.005–0.1 μm diameter size range using a Nuclepore-filter diffusion battery apparatus showed a median diameter of about 0.01 μm during times of high condensation nucleus (CN) concentrations. Aerosol black carbon concentrations exceeding 400 ng m−3 were detected at the surface and were more strongly correlated with CN concentrations than with aerosol scattering extinction (σsp), suggesting that aerosol carbon was generally associated with small particles rather than large particles. Measurements at Barrow during AGASP-I, conducted in March–April 1983, showed a series of aerosol events detected at the ground that were caused by rapid long-range transport paths to the vicinity of Barrow from Eurasia. These events were strongly correlated with aerosol loading in the vertical column (optical depth).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00052833
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aerosol black carbon measurements in the Arctic haze during AGASP-II (1989)
    Springer
    Journal of atmospheric chemistry 9 (1989), S. 347-361 
    Details
    ISSN: 1573-0662
    Keywords: Aerosol black carbon ; Arctic atmosphere ; Arctic haze ; combustion ; AGASP ; optical depth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract During the second Arctic Gas and Aerosol Sampling Program conducted in April 1986, we performed measurements of the optically absorbing carbonaceous component of the ambient aerosol from the NOAA WP-3D aircraft operating between sea level and 10 km altitude. We collected the aerosol of filters that were exposed for several hours; we also operated the aethalometer to measure the concentration of aerosol black carbon in real time. The filter analyses represent averages over the altitude range and time span during which the filter was collecting. The real-time results were sorted by altitude to calculate vertical profiles of black carbon concentration. Values typically ranged from 300 to 500 ng m−3 at lower altitudes, decreasing gradually to 25 to 100 ng m−3 at 8–10 km. Strong stratification at lower altitudes was frequently observed. The magnitude of these concentrations suggests that the sources are distant regions of considerable fuel consumption. The presence of this material in the tropospheric column and its probable deposition to the high-albedo surface may result in perturbations of the solar radiation balance. The concentrations measured at the highest altitudes may mean that particulate carbon and accompanying emissions for which it is a tracer are mixing into the stratosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00052842
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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