Seasonal variations in the concentration of10Be, Cl-, NO3-, SO42-, H2O2,210Pb,3H, mineral dust, and σ18O in greenland snow

  • Beer J
  • Finkel R
  • Bonani G
 et al. 
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Abstract

A detailed snow pit study at Dye 3, South Greenland, has been carried out in order to investigate the seasonal variations of10Be, Cl-, NO3-, SO42-, H2O2,210Pb,3H, Mn and σ18O. Special emphasis was placed on understanding the causes of10Be variations because this isotope can be used to trace the history of solar activity. A sampling interval of 5 cm was chosen to assure a mean time resolution of about 20 samples per year for the period 1978-1983. Four different categories of seasonal variations were identified: strong summer peaks (σ18O, H2O2,3H), weak bimodal peaks (NO3-, SO42-, conductivity,10Be), a fall peak (210Pb) and a winter-spring peak (Cl-, Mn). Although we are still far from a detailed understanding of the mechanisms which control the measured compositions, there are indications that different processes dominate at different seasons. NO3-, SO42-, Mn and Cl-variations suggest that aerosol transport is most important during winter-spring. In summer-fall there seems to exist a second period of long range transport from low latitude continental areas resulting in enhanced concentrations of210Pb,10Be and SO42-. © 1991.

Author-supplied keywords

  • Greenland
  • Snow chemistry
  • atmospheric chemistry
  • cosmogenic isotopes
  • glaciology

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Authors

  • J. Beer

  • R. C. Finkel

  • G. Bonani

  • H. Gäggeler

  • U. Görlach

  • P. Jacob

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