论文部分内容阅读
１９９９年夏季首次在玉龙山最大的白水 １号冰川积累区钻取了一支穿透整个粒雪层的１０ｍ冰芯，获取了近期数年的气候环境记录．深度 ７８ ｍ以上 δ１８Ｏ周期性波动变化特征明显，通过与可溶性离子，电导率和ＰＨ值，以及粒雪中污化冰层位置的对比分析，可鉴别出５个平衡年度的冰雪层，每年平均净积累折合水当量约 ９００ ｍｍ．由于融水渗浸的影响产生“均质化作用”， δ１８Ｏ变化幅度随深度增加而逐渐减小，在 ７．８ｍ以下，δ１８Ｏ值变为均匀分布，气候记录波动变化特征逐渐消失，但由于粒雪层内融水再冻结层的保护作用，仍使以上若干年的气候环境信息得以保存．可溶性离子以Ｃａ２＋和Ｍｇ２＋浓度较高，Ｃ１－和Ｎａ＋含量很低．说明冰芯内以冬季风形成的陆源沉积为主．Ｃ１－和Ｎａ＋的同步变化趋势指示出它们的相同来源，大部分层位上ＳＯ４２－和ＮＯ３－浓度都很低，说明冰川区很少受到人类污染．根据冰芯内年平均净积累厚度和积累区的消融情况，粗略估计粒雪盆的年平均降水量在 ２ ４００～ ３１ ００ ｍｍ之间．本研究为探索我国季风区温冰川现代过程找出一条新途径
In the summer of 1999, for the first time, a 10-m ice core penetrating the entire layer of snow was drilled for the first time in the glacial accumulation area of Baishui-1, the largest in Yulongshan, for the first time in recent years. The characteristics of cyclical variation of δ18O over a depth of 78 m are obvious. Through comparison with soluble ions, conductivity and pH, and the location of the contaminated ice in the snow, five ice layers can be identified in the balanced year, Accumulated equivalent water equivalent of about 900 mm. Due to the “homogenization effect” due to the influence of melt infiltration, the δ18O variation gradually decreases with increasing depth. Under 7.8m, the δ18O value becomes uniform and the variation of climate record fluctuation gradually disappears. However, The protective effect of melting water in the snow layer on the frozen layer still preserves the climatic and environmental information of the past several years. Soluble ions with Ca2 + and Mg2 + concentrations, C1- and Na + content is very low. This indicates that the terrestrial sediments dominated by winter monsoon in the ice core. The synchronic trend of C1- and Na + indicates their same origin, and the concentrations of SO42- and NO3- in most of the strata are very low, indicating that the glacier region is rarely polluted by human beings. According to the average net accumulated thickness in the ice core and the ablation of the accumulated area, the annual average precipitation of the pelicans is estimated to be between 2 400 and 31 00 mm. This study finds a new way to explore the modern process of warm glacier in monsoon region of our country