论文部分内容阅读
根据2004年11月至2005年10月在天山乌鲁木齐河源1号冰川积累区采集的雪坑样品研究发现,雪层中NO3-平均浓度存在季节性变化特征,湿季(4~10月)的NO3-浓度明显低于干季(11月至次年3月)。特别是在春季,在雪层上部出现的浓度峰,经过夏季淋溶改造,稀释并合并为稳定的浓度峰;雪层中各浓度峰普遍处于向下迁移的过程中。在后沉积过程中,距底部附加冰70~80 cm附近的雪层处存在一个过渡层,上部变化强烈,下部相对稳定;强淋溶期可以使NO3-溶质含量减小20%~60%。
According to the study of snow pits collected from glacier accumulation area No.1 in the Urumqi River source from November 2004 to October 2005, the NO3-average concentration in the snow layer shows seasonal variation. In the wet season (April to October), NO3 Concentrations were significantly lower than in the dry season (November to March). Especially in spring, the concentration peaks appearing in the upper part of the snow layer are diluted and merged into a stable concentration peak after leaching in summer. The concentration peaks in the snow layer are generally in the process of downward migration. During the post-deposition process, there is a transition layer in the snow layer near the bottom with additional ice of 70-80 cm. The upper part changes strongly and the lower part is relatively stable. The strong leaching period can reduce NO3- solute content by 20% -60%.