Abstract:

Snowpits samples were collected from three glaciers in the Longyearbyen region, Svalbard. By the analysis of samples, it is showed that Cl - and Na + which mainly from sea salt are dominated among soluble impurities in snowpits, and their concentrations are far higher than others. Ca 2+ which mainly comes from continent has highest concentrations in dirty layer of snowpits which were formed in autumn. Then snowpits have been dated by high values of Ca 2+ concentrations and δ 18 O, which represent autumn and summer layer, respectively. Seasonal variations in concentrations of sea salt ions, SO 2- 4and NO - 3 have been identified. Results indicate that concentrations of sea salt ions and SO 2- 4and NO - 3 show high value in spring, resulting from long range transport of marine aerosol from north Atlantic storms and mid latitude anthropogenic pollution, respectively. Also concentrations of sea salt ions and SO 2- 4 , NO - 3 show high value in summer. High concentrations of sea salt ions in summer are contributed by local marine aerosol, SO 2- 4 reflect local marine aerosol, high scavenging ratios and oxidation of marine biogenic emissions, NO - 3 may reflect lighting in atmosphere and high scavenging ratios. By comparing ions concentrations between in Longyearbyen and other remote regions, such as Greenland, Antarctic and Qinghai Tibetan Plateau, it is showed that ion concentration in snowpits is higher in Longyearbyen than other regions, especially for concentrations of sea salt ions.