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通过对2010年6月下旬于阿尔泰山蒙赫海尔汗冰川北支采集的新降雪、再冻结冰、冰雪融水、河水及雪坑样品中δ18O和δD的测定以及过量氘的计算,利用HYSPLIT气团轨迹模型,对研究区降水中稳定同位素的空间分布特征及水汽来源进行了初步研究.结果表明:新雪、再冻结冰以及河水样品中δ18O的空间分布均呈现出显著的“反高度效应”特征,这是降雪过程中不同海拔高度水汽来源的差异造成的;不同水体样品中均有较高的过量氘,说明内陆再循环水汽长期对研究区的降水产生显著影响.进一步分析表明,影响研究区降水的内陆再循环水汽主要来自于西西伯利亚平原湿地和沼泽的蒸散发.
Based on the determination of δ18O and δD and the calculation of excess deuterium in new snowfall, re-freezing, ice-melting, river water and snow pits collected in the northern branch of the Menghe Haer Glacier in the Altay Mountains in late June 2010, the HYSPLIT air mass Trajectory model, the spatial distribution of stable isotopes in the precipitation and the sources of water vapor were studied.The results showed that the spatial distribution of δ18O in fresh snow, re-freezing and river water samples showed significant “anti-height effect” Characteristics, which is caused by the difference of water vapor sources at different altitudes during the snowfall; the higher excess deuterium in different water samples indicates that the inland recirculation water vapor has a significant effect on the precipitation in the study area for a long time.Further analysis shows that the influence The inland recirculation of water vapor from precipitation in the study area mainly comes from the evapotranspiration of the wetlands and swamps in the western Siberia plain.