论文部分内容阅读
根据2002年9月至2005年12月在天山乌鲁木齐河源1号冰川积累区采集的表层雪样品,揭示了该区表层雪中δ18O值的季节变化特征,讨论了水汽输送对降水中δ18O值变化的影响。研究表明,天山乌鲁木齐河源1号冰川表层雪中δ18O值季节变化显著,变幅可达12.59‰左右,其变化趋势和气温的变化趋势基本一致,二者存在显著的正相关关系,即温度效应;但后沉积作用使干季和湿季温度效应表现出不同特点。根据水汽追踪结果,该地区干季水汽来源主要与西风环流控制的水汽输送有密切关系;湿季则受内陆和局地水汽影响强烈。水汽输送的距离远近和性质对该地区降水中δ18O值变化都有一定的影响。
Based on the surface snow samples collected from glacier accumulation area No.1 in the Urumqi River source from September 2002 to December 2005, the seasonal variation of δ18O in surface snow was revealed. The variation of δ18O value in precipitation was discussed influences. The results show that there is a significant seasonal variation of δ18O in surface snow of glacier No. 1 in the Tushan Mountains, with an amplitude of about 12.59 ‰. The trend of the δ18O value is basically the same with that of the temperature. There is a significant positive correlation between the δ18O value and the temperature effect. However, after deposition, the temperature effects of dry season and wet season show different characteristics. According to the results of water vapor tracing, the source of dry-season water vapor in this area is mainly related to the water vapor transport controlled by westerly circulation; the wet season is strongly influenced by inland and local water vapor. The distance and nature of water vapor transport have a certain impact on the δ18O values in the precipitation.