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纳木那尼冰川是喜马拉雅山西部地区规模较大的冰川之一,也是开展冰芯气候意义研究有重要潜在价值的冰川。但由于纳木那尼冰川位于西风环流和印度季风影响范围的交界带,不同的环流系统所输送的水汽带来不同的降水稳定同位素信号。因此确定纳木那尼冰芯同位素记录的气候意义是开展该地区冰芯气候记录研究的前提条件。2008年在该冰川积累区所钻取的8.78m浅冰芯为这一研究工作提供了可能。本文对该冰芯的稳定同位素记录以及普兰气象站的气象数据进行了分析与讨论。研究结果表明,同位素的年际变化与当地普兰县气象站气温的年际变化具有较好的对应关系。这可能与当地降水受到夏季季风的影响较小有关。测量结果表明早期的深冰芯钻取点位于冰川的消融区,而冰川的积累区仍位于冰川更高的区域,而且积累区冰川厚度更大,更有可能保存更长时间尺度的冰芯记录。这也为以后开展新的纳木那尼深孔冰芯及气候意义研究提供了借鉴。
The Namu Nghini glacier, one of the larger glaciers in the western Himalayas, is also a glacier with significant potential for studying the climatic significance of ice cores. However, due to the presence of the Namtynini Glacier at the boundary between the westerly circulation and the Indian monsoon, the water vapor transported by different circulation systems brings about different precipitation stable isotope signals. Therefore, the determination of the climatic significance of the Najnnani ice core isotope record is a prerequisite for the study of ice core climate records in the area. The 8.78m shallow ice core drilled in the glacier accumulation area in 2008 provided the possibility for this research. In this paper, stable isotope records of ice core and meteorological data of Pulan Station are analyzed and discussed. The results show that the interannual variation of isotopes has a good correspondence with the interannual variability of temperature at the Prambanan Station. This may be related to the fact that the local precipitation is less affected by the summer monsoon. The results of the measurements show that early deep ice core drilling sites were located in the glacier’s ablation zone while glacial accumulation was still located in higher glaciers and that glaciers in the accumulation zone were thicker and were more likely to hold ice core records for longer time scales . This also provides reference for the future research on the new deep-hole ice core of Natuna and its significance in climate.