1999年和2000年夏季南极菲尔德斯半岛N_2O浓度对比

CONTRAST BETWEEN NITROUS OXIDE CONCENTRATIONS IN ANTARCTIC FILDES PENINSULA IN 1999 AND 2000 SUMMERS

1999与 2 0 0 0年夏季对南极菲尔德斯半岛不同地点大气中 N2 O浓度进行了监测 ,分析了苔藓植被区 N2 O浓度季节变化特征 ;2 0 0 0年夏季该植被区 N2 O浓度均值为 ( 31 0 .7± 4.4)×1 0 - 9(体积百分比 ) ,比 1 999年的 ( 32 1 .9± 3.3)× 1 0 - 9约低 1 1× 1 0 - 9;阿德雷岛企鹅滩及其沙坝处N2 O浓度变化趋势与苔藓植被区相一致 ,浓度均值分别为 ( 31 2 .4± 5 .1 )× 1 0 - 9和 ( 31 2 .7± 5 .3)× 1 0 - 9,比 1 999年约低 9× 1 0 - 9;另外 ,不同地点大气中 N2 O浓度普遍比 1 999年低 ,但整体变化规律相似 :各考察站区 N2 O浓度普遍高于无人区 ;唯一例外的是企鹅聚集区 N2 O浓度却高于各考察站区 ,暗示了企鹅及其排泄物、人为源是南极大气中 N2 O主要的源。本文初步探讨了 N2

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.