We drilled an 81.2-m-long ice core in the accumulation area (5860 m a.s.l.) of Trambau Glacier in the Rolwaling region during October–November 2019. The drilling operation was conducted with a lightweight electro-mechanical drill system after two reconnaissance fieldworks in 2017 and 2018, during which two shallow firn cores were drilled with a hand auger. The drill system and ice core samples were transported by helicopters at a high elevation of 6000 m a.s.l. A further challenging issue was the ice core transportation between Nepal and Japan, as no regular commercial flight was available for the frozen samples. The addition of dry ice imported from India immediately prior to leaving Nepal allowed the ice core samples to be successfully transported to a cold room in Japan, and remain in a frozen state. Stratigraphic observations during the drilling operation suggest the drill site has been affected by melting and refreezing.

中文翻译：

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尼泊尔喜马拉雅山特朗堡冰川高海拔堆积带的冰芯钻探

2019 年 10 月至 11 月，我们在 Rolwaling 地区的 Trambau Glacier 堆积区（5860 m asl）钻了一个 81.2 米长的冰芯。在 2019 年的两次实地勘察后，使用轻型机电钻机系统进行了钻探作业。 2017 年和 2018 年，期间用手动螺旋钻钻了两个浅层岩心。钻探系统和冰芯样品由直升飞机在海拔 6000 米的高海拔地区运输 另一个具有挑战性的问题是尼泊尔和日本之间的冰芯运输，因为冷冻样品没有定期的商业航班。在离开尼泊尔之前加入从印度进口的干冰，使冰芯样本成功地运送到日本的冷藏室，并保持冷冻状态。