Abstract:

Atmospheric N 2O concentrations at different sites were measured on Antarctic Fildes Peninsula in 1999 and 2000 summers. The characters of seasonal changes of N 2O concentrations were also analyzed. The average of N 2O concentrations in the areas covered by moss was ((310.7±4.4)×10 -9 ) in 2000 summer,11×10 -9 lower than that in 1999 summer ((321.9±3.3)×10 -9 ); In addition,the changes of N 2O concentrations at penguin beach of Ardely Island and sand dam were consistent with those in the areas covered by moss and the averages of their N 2O concentrations were (312.4±5.1)×10 -9 and (312.7±5.3)×10 -9 ,respectively,9×10 -9 lower than that of the areas covered by moss in 1999 summer. The atmospheric N 2O concentrations at different sites in 2000 summer were universally lower than those in 1999 summer,but the whole variable rules were similar. N 2O concentrations at the scientific research stations were higher than those in remote areas,but N 2O concentrations in penguin habitats were exceptionally higher than those at the scientific research stations,which showed that anthropogenic sources ,penguins and their droppings were the sources for atmospheric N 2O. The reasons why N 2O concentrations abnormally fell down were also discussed in this paper.